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Wei Y, Song L, Ma Y, Mu J, Yi W, Sun J, Qu K, Cui Z. Implications of ocean warming and acidification on heavy metals in surface seawater of the Bohai Sea. JOURNAL OF HAZARDOUS MATERIALS 2024; 477:135305. [PMID: 39053071 DOI: 10.1016/j.jhazmat.2024.135305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 07/15/2024] [Accepted: 07/21/2024] [Indexed: 07/27/2024]
Abstract
At present, a clear dependency of the dynamics upon temperature and pH has not been established for many heavy metals (HMs), so making it difficult to project and quantify the impact of ocean warming and acidification on metal biogeochemistry in future scenarios. To understand the responses of HMs to future ocean warming and acidification, we estimated the spatial-temporal variations and pollution status of six dissolved HMs (i.e., Cu, Zn, Pb, Cd, Hg, and As) in surface seawater throughout the Bohai Sea during 2012-2014. The results showed that the average concentrations of Cu, Zn, Pb, Cd, Hg, and As in seawater of the Bohai Sea were between 2.01-3.18, 10.47-15.58, 0.85-2.31, 0.25-0.55, 0.05-0.13, and 1.24-1.98 μg L-1, respectively. Spatially, the average concentrations of the studied HMs generally decreased from the three bays towards the central area, except for Hg which was relatively high in the central Bohai Sea in some cases. This implied that, in addition to continental inputs, there may be other processes affecting the distribution pattern of Hg, such as cyclonic or anticyclonic gyres, benthic fluxes between surface and bottom layers, and some marine planktonic and microbial activities. The pollution assessments of six HMs in seawater revealed that the major risk pollutants were Pb and Hg across the Bohai Sea. Analyses of the local and interactive effects of temperature and pH on HMs showed that the interactive effect of changing temperature and pH on HMs is much more complex than a direct temperature/pH relationship with HMs. Altogether, the results suggested that future ocean warming and acidification will significantly influence the concentrations of dissolved HMs in seawater of the Bohai Sea, but with different relationships.
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Affiliation(s)
- Yuqiu Wei
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China; Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China
| | - Lun Song
- Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, China
| | - Yuanqing Ma
- Shandong Marine Resources and Environment Research Institute, Yantai, China
| | - Jiandong Mu
- Hebei Ocean and Fisheries Science Research Institute, Qinhuangdao, China
| | - Wei Yi
- Tianjin Agro-Ecological Environment Monitoring and Agricultural Product Quality Testing Center, Tianjin, China
| | - Jun Sun
- Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, China
| | - Keming Qu
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China; Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China
| | - Zhengguo Cui
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China; Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China.
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Wang F, Wang J, Cao T, Ji X, Yan J, Ding S, Chen N. Seasonal hypoxia enhances sediment iron-bound phosphorus release in a subtropical river reservoir. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 936:173261. [PMID: 38761934 DOI: 10.1016/j.scitotenv.2024.173261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 05/11/2024] [Accepted: 05/13/2024] [Indexed: 05/20/2024]
Abstract
Dams worldwide commonly accelerate the eutrophication of reservoirs. While the seasonal hypoxia in deep reservoirs is widely acknowledged, there is limited research on its impact on benthic phosphorus (P) cycling and P fraction release from the reservoir sediments. Here we show that seasonal hypoxia enhances sediment P release and P fluxes at the sediment-water interface (SWI) which might alter P dynamics in deep reservoirs. We conducted a detailed measurement of sediment P fractions through the SEDEX approach, combined with a labile P gradient analysis using the diffusive gradients in thin films (DGT) technique to understand P cycling patterns in sediments during the transition period from spring (oxic) to late summer (hypoxic) conditions. The sediment P pool was predominantly composed of iron-bound phosphorus (Fe-P, 76-80 %), primarily due to the widespread occurrence of lateritic red soil (rich in Fe2O3/MnO2) in subtropical areas. More organic-P was observed in summer compared to spring. A significant increase in labile P occurred at the depth of 0-4 cm and 0-1 cm in spring and summer, respectively, where sediment P release was primarily governed by the reduction of Fe-P and the generation of S2-. A higher apparent fluxes of phosphate across the SWI were observed in summer characterized by higher temperature and lower oxygen levels. The current results suggest that seasonal hypoxia was a crucial factor affecting P cycling and diffusion in deep reservoirs. These findings present important implications for the ecology and management of the watershed-coast ecosystem.
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Affiliation(s)
- Fenfang Wang
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
| | - Jie Wang
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Taotao Cao
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Xiuwen Ji
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Jing Yan
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Nengwang Chen
- Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China.
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Jia Z, Liu Q, Hu J, Li S, Chen H. A microcosm evaluation of metal cycling in an urbanized contaminated estuary varying with oxic-hypoxic-anoxic-reoxic transition: Behavior, fluxes, and mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 930:172769. [PMID: 38670363 DOI: 10.1016/j.scitotenv.2024.172769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/31/2024] [Accepted: 04/23/2024] [Indexed: 04/28/2024]
Abstract
Water hypoxia and metal pollution are commonly co-existed in urbanized estuaries. This study focuses on the effect of an extended dissolved oxygen (DO) full-life dynamics (86 days) on metal behavior across the sediment-water interface through laboratory microcosms from two typical zones in Pearl River Estuary. Combining our time-series results of concentrations and fluxes, it showed that Co, Ni, and Zn consistently presented a release-precipitation-release trajectory with an oxic-hypoxic-anoxic-reoxic transition, characterized with highly variable behavior in the hypoxic-anoxic hotmoments. In parallel, changing DO dynamics significantly activated a repartitioning process of Co, Ni, and Zn among several species and elevated their risk in sediments, promoting the formation of more labile species in the 0-10 mm hotspots, where metals sensitively responded. Over DO transition, metal cycling was tightly co-related with Fe, Mn, and S elements. It was found that Mn was dominated in low oxygen-hypoxic period, but switched to S and Fe in anoxic stage, limiting sustained metal liberation to overlying water. Enlarging this experiment to practice, released Zn fluxes from sediments in hypoxic summer could contribute about ∼2.0% to their stocks in water column, while increase to 20% (1 m bottom water) in highly-stratified zones. This study has certain significance in understanding the long-term metal behavior and fate in estuarine regions, even lakes and reservoirs.
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Affiliation(s)
- Zhenzhen Jia
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | - Qiuxin Liu
- Eco-Environmental Monitoring and Research Center, Pearl River Valley and South China Sea Ecology and Environment Administration, Ministry of Ecology and Environment, Guangzhou 510611, China
| | - Jiatang Hu
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
| | - Shiyu Li
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | - Hujunjie Chen
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
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Dong Y, Sun Y, Liu Z, Du Z, Wang J. Predicting dissolved oxygen level using Young's double-slit experiment optimizer-based weighting model. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 351:119807. [PMID: 38100864 DOI: 10.1016/j.jenvman.2023.119807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 11/30/2023] [Accepted: 12/06/2023] [Indexed: 12/17/2023]
Abstract
Accurate prediction of the dissolved oxygen level (DOL) is important for enhancing environmental conditions and facilitating water resource management. However, the irregularity and volatility inherent in DOL pose significant challenges to achieving precise forecasts. A single model usually suffers from low prediction accuracy, narrow application range, and difficult data acquisition. This study proposes a new weighted model that avoids these problems, which could increase the prediction accuracy of the DOL. The weighting constructs of the proposed model (PWM) included eight neural networks and one statistical method and utilized Young's double-slit experimental optimizer as an intelligent weighting tool. To evaluate the effectiveness of PWM, simulations were conducted using real-world data acquired from the Tualatin River Basin in Oregon, United States. Empirical findings unequivocally demonstrated that PWM outperforms both the statistical model and the individual machine learning models, and has the lowest mean absolute percentage error among all the weighted models. Based on two real datasets, the PWM can averagely obtain the mean absolute percentage errors of 1.0216%, 1.4630%, and 1.7087% for one-, two-, and three-step predictions, respectively. This study shows that the PWM can effectively integrate the distinctive merits of deep learning methods, neural networks, and statistical models, thereby increasing forecasting accuracy and providing indispensable technical support for the sustainable development of regional water environments.
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Affiliation(s)
- Ying Dong
- School of Statistics, Dongbei University of Finance and Economics, No. 217, Jianshan Road, Shahekou District, Dalian, Liaoning Province, 116025, China.
| | - Yuhuan Sun
- School of Statistics, Dongbei University of Finance and Economics, No. 217, Jianshan Road, Shahekou District, Dalian, Liaoning Province, 116025, China.
| | - Zhenkun Liu
- School of Management, Nanjing University of Posts and Telecommunications, No 66 Xinmofan Road, Gulou District, Nanjing, Jiangsu Province, 210023, China.
| | - Zhiyuan Du
- Department of Statistics, Virginia Polytechnic Institute and State University, 250 Drillfield Drive, Blacksburg, VA, 24060, United States.
| | - Jianzhou Wang
- Institute of Systems Engineering, Macau University of Science and Technology, Taipa Street, Macao, 999078, China.
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Giarikos DG, White L, Daniels AM, Santos RG, Baldauf PE, Hirons AC. Assessing the ecological risk of heavy metal sediment contamination from Port Everglades Florida USA. PeerJ 2023; 11:e16152. [PMID: 38025702 PMCID: PMC10655720 DOI: 10.7717/peerj.16152] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 08/31/2023] [Indexed: 12/01/2023] Open
Abstract
Port sediments are often contaminated with metals and organic compounds from anthropogenic sources. Remobilization of sediment during a planned expansion of Port Everglades near Fort Lauderdale, Florida (USA) has the potential to harm adjacent benthic communities, including coral reefs. Twelve sediment cores were collected from four Port Everglades sites and a control site; surface sediment was collected at two nearby coral reef sites. Sediment cores, sampled every 5 cm, were analyzed for 14 heavy metals using inductively coupled plasma-mass spectrometry. Results for all three locations yielded concentration ranges (µg/g): As (0.607-223), Cd (n/d-0.916), Cr (0.155-56.8), Co (0.0238-7.40), Cu (0.004-215), Pb (0.0169-73.8), Mn (1.61-204), Hg (n/d-0.736), Mn (1.61-204), Ni (0.232-29.3), Se (n/d-4.79), Sn (n/d-140), V (0.160-176), and Zn (0.112-603), where n/d = non-detected. The geo-accumulation index shows moderate-to-strong contamination of As and Mo in port sediments, and potential ecological risk indicates moderate-to-significantly high overall metal contamination. All four port sites have sediment core subsamples with As concentrations above both threshold effect level (TEL, 7.24 µg/g) and probable effect level (PEL, 41.6 µg/g), while Mo geometric mean concentrations exceed the background continental crust level (1.5 µg/g) threshold. Control site sediments exceed TEL for As, while the reef sites has low to no overall heavy metal contamination. Results of this study indicate there is a moderate to high overall ecological risk from remobilized sediment due to metal contamination. Due to an imminent dredging at Port Everglades, this could have the potential to harm the threatened adjacent coral communities and surrounding protected habitats.
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Affiliation(s)
- Dimitrios G. Giarikos
- Chemistry and Physics, Nova Southeastern University, Fort Lauderdale, FL, United States of America
- SECLER: Study of Environmental Conservation through Leading-Edge Research, Nova Southeastern University, Fort Lauderdale, FL, United States of America
| | - Laura White
- Department of Marine and Environmental Sciences, Nova Southeastern Univeristy, Fort Lauderdale, FL, United States of America
| | - Andre M. Daniels
- Wetland and Aquatic Research Center, U.S. Geological Survey, Davie, FL, United States of America
| | - Radleigh G. Santos
- SECLER: Study of Environmental Conservation through Leading-Edge Research, Nova Southeastern University, Fort Lauderdale, FL, United States of America
- Department of Mathematics, Nova Southeastern University, Fort Lauderdale, FL, United States of America
| | - Paul E. Baldauf
- SECLER: Study of Environmental Conservation through Leading-Edge Research, Nova Southeastern University, Fort Lauderdale, FL, United States of America
- Department of Marine and Environmental Sciences, Nova Southeastern Univeristy, Fort Lauderdale, FL, United States of America
| | - Amy C. Hirons
- SECLER: Study of Environmental Conservation through Leading-Edge Research, Nova Southeastern University, Fort Lauderdale, FL, United States of America
- Department of Marine and Environmental Sciences, Nova Southeastern Univeristy, Fort Lauderdale, FL, United States of America
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Duan L, Song J, Zhang Y, Yuan H, Li X, Sun L. Role of marine algal blooms in the release of arsenic at the sediment-seawater interface: Evidence from microcosm experiments. WATER RESEARCH 2023; 244:120508. [PMID: 37633211 DOI: 10.1016/j.watres.2023.120508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/12/2023] [Accepted: 08/18/2023] [Indexed: 08/28/2023]
Abstract
Algal blooms can aggravate arsenic (As) release from sediments and thus pose a pollution risk in the marine environment. However, the driving mechanism of algal blooms on sedimentary As cycling remains unclear. This study undertakes the first comprehensive examination of As release mechanisms under algal bloom conditions based on the evidence provided by temporal and depth profile changes of As species in the overlying water column, porewater and sediment, as well as As-related functional genes over the course of a 30-day incubation experiment using algal addition. The higher rate of increase of dissolved total As (dTAs) concentrations in a high biomass algal group (HAG) than an experimental control group (CG) suggested that algal degradation promoted the release of sedimentary As. The solid phase in all experimental groups remained rich in As(V), while in porewater As(III) and As(V) were the dominant As species during the initial rapid and subsequent slow degradation phases of organic matter, respectively, indicating that microbial reduction of As(V) and Fe(III) controlled the release of As during these two periods. A pronounced increase in arrA gene copies, and not a corresponding increase in the Geobacter copies, in HAG relative to CG supported the notion that algal blooms promoted microbial As(V) reduction. Additionally, the lower concentration of dissolved As(III) and cumulative dTAs flux in the sterilized-HAG treatment than in the sterilized-CG one further suggested that geochemically-mediated processes were not the main pathways of As release. Finally, it is estimated that summer algal blooms in the Changjiang Estuary can cause the release of 1440 kg of sedimentary As into the overlying water.
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Affiliation(s)
- Liqin Duan
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, PR China.
| | - Jinming Song
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, PR China
| | - Yuting Zhang
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Huamao Yuan
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, PR China
| | - Xuegang Li
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, PR China
| | - Lingling Sun
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; Public Technology Service Center, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China
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Wang Q, Wang J, Zhong Q, Su W, Ma Y, Du J, Xiao T. Trace elements accumulation over a century in sediment cores from a tectonic lake on the Qinghai-Tibet plateau: Source identification and risk assessment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 329:117030. [PMID: 36584509 DOI: 10.1016/j.jenvman.2022.117030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 12/10/2022] [Accepted: 12/11/2022] [Indexed: 06/17/2023]
Abstract
A record of trace elements in lake sediment can help in assessing the impact of anthropogenic activities on aquatic environments. In the present work, the trace elements profiles (Cu, Cr, Pb, Zn, As, and Cd) were determined in four sediment cores (QH01, QH02, QH07, and Z04) collected in 2012 and 2014 from Lake Qinghai to reconstruct the history of anthropogenic activity in the watershed and to evaluate the pollution status and eco-environmental risks of a typical Third Pole lake environment over the past century. The concentrations of Cu, Cr, Pb, Zn, As, and Cd in these studies ranged between 19.4 and 34.2 μg g-1, 35.6-53.6 μg g-1, 3.10-26.8 μg g-1, 56.4-93.5 μg g-1, 6.20-15.3 μg g-1, and 0.086-0.572 μg g-1, respectively. Statistical analyses indicated that the Pb, Zn, and Cd contents combination of coal, gasoline burning, and agricultural activities in the Lake Qinghai catchment and larger-scale atmospheric inputs during the past 60 years. The enrichment factors for Pb, Zn, and Cd in the sediments of Lake Qinghai are considered to be related to the region of the Qinghai-Tibet Plateau and national socioeconomic development. Enrich factor of Cd values was higher than 3.5 and maximum values of the geo-accumulation index of Pb and Cd were observed in the top layer of the sediment (0-2 cm), indicating moderate contamination. The RI values suggest that the risks to the ecological environment of Lake Qinghai are increasing since the 1950s. The results of this study illustrate that Lake Qinghai is still experiencing high trace elements pollution pressure due to the rapid environmental changes caused by anthropogenic activities on the remote and isolated Qinghai-Tibet Plateau.
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Affiliation(s)
- Qiugui Wang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), Qinghai Normal University, China
| | - Jinlong Wang
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
| | - Qiangqiang Zhong
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Weigang Su
- Qinghai Earthquake Agency, Xining 810001, China
| | - Yujun Ma
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), Qinghai Normal University, China
| | - Jinzhou Du
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
| | - Tangfu Xiao
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China.
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Wang Y, Tang T, Ren J, Zhao Y, Hou Y, Nie X. Hypoxia aggravates the burden of yellowstripe goby (Mugilogobius chulae) under atorvastatin exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 255:106381. [PMID: 36587518 DOI: 10.1016/j.aquatox.2022.106381] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/02/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
In the present study, an estuarine benthic fish, Mugilogobius chulae (M. chulae), was exposed to hypoxia, atorvastatin (ATV), a highly used and widely detected lipid-lowering drug in aquatic environment, and the combination of hypoxia and ATV for 7 days, respectively, so as to address and compare the effects of the combination of hypoxia and ATV exposure on M. chulae. The results showed that lipid metabolism in M. chulae was greatly affected: lipid synthesis was blocked and catabolism was enhanced, exhibiting that lipids content were heavily depleted. The combined exposure of hypoxia and ATV caused oxidative stress and induced massive inflammatory response in the liver of M. chulae. Signaling pathways involving in energy metabolism and redox responses regulated by key factors such as HIF, PPAR, p53 and sirt1 play important regulatory roles in hypoxia-ATV stress. Critically, we found that the response of M. chulae to ATV was more sensitive under hypoxia than normoxia. ATV exposure to aquatic non-target organisms under hypoxic conditions may make a great impact on the detoxification and energy metabolism, especially lipid metabolism, and aggravate the oxidative pressure of the exposed organisms.
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Affiliation(s)
- Yimeng Wang
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Tianli Tang
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Jinzhi Ren
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Yufei Zhao
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Yingshi Hou
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Xiangping Nie
- Department of Ecology, Jinan University, Guangzhou, 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou, 510632, China.
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Zhang X, Qu H, Liu Q, Zhang Y, Hu D, Tian H. Ecological of human health risk of total petroleum hydrocarbons and four metals in seawater of the southeastern Bohai Sea, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:5758-5773. [PMID: 35978248 DOI: 10.1007/s11356-022-22584-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
To obtain systematic knowledge on the waterborne pollution status and ecological and human health risk of total petroleum hydrocarbons (TPHs) and metals in the southeastern Bohai Sea, seawater samples were collected in three seasons from 2014 to 2018. TPHs and mercury (Hg) levels were determined by ultraviolet spectrophotometry and cold atomic absorption spectrometry, respectively, and concentrations of copper (Cu), lead (Pb), and cadmium (Cd) were detected by anodic stripping voltammetry. Spatial distribution patterns indicated that these waterborne pollutants are mainly sourced from terrestrial inputs. Temporal variation showed that Pb contents decreased in the past five years, and summer exhibited higher concentrations of Hg, Cu, and Cd than spring and autumn. Spearman's rank correlation coefficients demonstrated that temperature correlated positively with Cu content, while dissolved oxygen, pH, and suspended particulate material correlated negatively with pollutant concentrations. While hazard quotient values were lower than 1 for TPHs, Hg, Pb, and Cd, the hazard quotient of Cu (4.88) was greater than 1, suggesting potential ecological risks of this element in seawater of the southeastern Bohai Sea. The total target hazard quotients of Hg, Cu, Pb, and Cd in seawater of the southeastern Bohai Sea were all lower than 1, which indicated that there was no noncarcinogenic risk caused by heavy metals in seawater of the southeastern Bohai Sea. However, the carcinogenic risk of Cd (1.54 × 10-5) was in the range of 10-6-10-4, which may lead to the occurrence of cancer. This study sounds an alarm for stricter control of metal emissions into this sea area.
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Affiliation(s)
- Xiaorong Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, Shandong, China
| | - Hongyong Qu
- Yantai Ecological Environment Monitoring Center, Yantai, 264001, Shandong, China
| | - Qiaofang Liu
- Yantai Ecological Environment Monitoring Center, Yantai, 264001, Shandong, China
| | - Yinghong Zhang
- Yantai Ecological Environment Monitoring Center, Yantai, 264001, Shandong, China
| | - Deyan Hu
- Yantai Marine Economic Research Institute, Yantai, 264000, Shandong, China
| | - Hua Tian
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, Shandong, China.
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Pan F, Xiao K, Guo Z, Li H. Effects of fiddler crab bioturbation on the geochemical migration and bioavailability of heavy metals in coastal wetlands. JOURNAL OF HAZARDOUS MATERIALS 2022; 437:129380. [PMID: 35897186 DOI: 10.1016/j.jhazmat.2022.129380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/31/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
Fiddler crabs, found in coastal wetlands worldwide, function as ecosystem engineers. Their burrowing activity can significantly alter biogeochemistry at the local scale, however, the mobility of heavy metals (HMs) in burrow sediments remains unclear. Here, we used diffusive gradients in thin-film probes to obtain bioavailable Fe and HMs (Cu, Zn, Ni, Cd, Pb, Co, and Mo) in crab burrows from coastal wetlands (mudflats, salt marshes, and mangroves). The depth-profile results showed that most HMs were enriched at shallow and deep depths but deficient at middle depths. We highlighted that bioturbation improved oxic conditions, enhanced HM concentrations, and favored dissolved HM retention in burrow sediments, which served as a sink for overlying water HMs via burrow flushing but a potential source of particle HMs via enhanced resuspension. In deep anoxic layers, Fe(III) reduction drove the remobilization of HMs, except Cu and Mo, leading to the co-release of HMs with Fe. This Fe-HM coupling/decoupling was verified using enhanced two-dimensional high-resolution imaging, which revealed highly spatial heterogeneity of multiple HMs. Moreover, the hydrological conditions regulating bioturbation effects on HM behavior varied across different coastal wetlands. With coastal environmental changes, the key role of ubiquitous bioturbation in HM migration and bioavailability should be reconsidered.
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Affiliation(s)
- Feng Pan
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Kai Xiao
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, PR China.
| | - Zhanrong Guo
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Hailong Li
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, PR China
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11
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Hu X, Shi X, Su R, Jin Y, Ren S, Li X. Spatiotemporal patterns and influencing factors of dissolved heavy metals off the Yangtze River Estuary, East China Sea. MARINE POLLUTION BULLETIN 2022; 182:113975. [PMID: 35939928 DOI: 10.1016/j.marpolbul.2022.113975] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/19/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
Dissolved heavy metal pollution in the ocean is becoming an environmental concern. Their distribution patterns are complex and influenced by multiple factors in the coastal ocean. Therefore, more investigations are needed to understand their behavior in the seawater. This study systematically investigated the distribution of Cu, Pb, Cd, As, Zn and seawater properties in the surface and bottom water off the Yangtze River Estuary, East China Sea in spring, summer and autumn, 2019. The results showed significant spatiotemporal distribution that three-zone-pattern of estuary, nearshore, and offshore can be divided. While sources, hydrodynamics, biological uptake and sediment resuspension affected the overall distribution, dissolved oxygen and pH dominantly influenced the estuary and offshore respectively, with more complex factors in the nearshore. Low ecological risks were assessed during the study, but global warming, ocean acidification and hypoxia are essential concerns to understand the biogeochemistry of dissolved heavy metals in the ocean.
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Affiliation(s)
- Xupeng Hu
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Zhejiang Marine Ecology and Environment Monitoring Center, Zhoushan 316021, China; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xiaoyong Shi
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; National Marine Hazard Mitigation Service, Ministry of Natural Resources, Beijing 100194, China.
| | - Rongguo Su
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yimin Jin
- Zhejiang Marine Ecology and Environment Monitoring Center, Zhoushan 316021, China
| | - Shijun Ren
- Zhejiang Marine Ecology and Environment Monitoring Center, Zhoushan 316021, China
| | - Xinxin Li
- Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, Guangdong, China.
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12
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van de Velde SJ, Burdorf LDW, Hidalgo-Martinez S, Leermakers M, Meysman FJR. Cable Bacteria Activity Modulates Arsenic Release From Sediments in a Seasonally Hypoxic Marine Basin. Front Microbiol 2022; 13:907976. [PMID: 35910627 PMCID: PMC9329047 DOI: 10.3389/fmicb.2022.907976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 05/30/2022] [Indexed: 12/01/2022] Open
Abstract
Eutrophication and global change are increasing the occurrence of seasonal hypoxia (bottom-water oxygen concentration <63 μM) in coastal systems worldwide. In extreme cases, the bottom water can become completely anoxic, allowing sulfide to escape from the sediments and leading to the development of bottom-water euxinia. In seasonally hypoxic coastal basins, electrogenic sulfur oxidation by long, filamentous cable bacteria has been shown to stimulate the formation of an iron oxide layer near the sediment-water interface, while the bottom waters are oxygenated. Upon the development of bottom-water anoxia, this iron oxide “firewall” prevents the sedimentary release of sulfide. Iron oxides also act as an adsorption trap for elements such as arsenic. Arsenic is a toxic trace metal, and its release from sediments can have a negative impact on marine ecosystems. Yet, it is currently unknown how electrogenic sulfur oxidation impacts arsenic cycling in seasonally hypoxic basins. In this study, we presented results from a seasonal field study of an uncontaminated marine lake, complemented with a long-term sediment core incubation experiment, which reveals that cable bacteria have a strong impact on the arsenic cycle in a seasonally hypoxic system. Electrogenic sulfur oxidation significantly modulates the arsenic fluxes over a seasonal time scale by enriching arsenic in the iron oxide layer near the sediment-water interface in the oxic period and pulse-releasing arsenic during the anoxic period. Fluxes as large as 20 μmol m−2 day−1 were measured, which are comparable to As fluxes reported from highly contaminated sediments. Since cable bacteria are recognized as active components of the microbial community in seasonally hypoxic systems worldwide, this seasonal amplification of arsenic fluxes is likely a widespread phenomenon.
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Affiliation(s)
- Sebastiaan J. van de Velde
- Department of Geoscience, Environment and Society, Université Libre de Bruxelles, Brussels, Belgium
- Operational Directorate Natural Environment, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
- *Correspondence: Sebastiaan J. van de Velde
| | - Laurine D. W. Burdorf
- Microbial Systems Technology, Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Silvia Hidalgo-Martinez
- Microbial Systems Technology, Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Martine Leermakers
- Analytical, Environmental and Geo-Chemistry, Department of Chemistry, Vrije Universiteit Brussel, Brussels, Belgium
| | - Filip J. R. Meysman
- Microbial Systems Technology, Department of Biology, University of Antwerp, Antwerp, Belgium
- Department of Biotechnology, Delft University of Technology, Delft, Netherlands
- Filip J. R. Meysman
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13
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Liu X, Sheng Y, Liu Q, Jiang M. Dissolved oxygen drives the environmental behavior of heavy metals in coastal sediments. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:297. [PMID: 35338431 DOI: 10.1007/s10661-022-09975-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 03/19/2022] [Indexed: 06/14/2023]
Abstract
In this study, the impacts of dissolved oxygen (DO) on dynamics concentrations of heavy metals (Cu, Cd, Cr, and Pb) from estuary sediments were investigated in a 49-day laboratory simulation. The exchange flux method, Bureau Communautaire de Référence (BCR) sequential extraction procedure, and risk assessment code (RAC) were used to analyze the behavior of heavy metals. The results indicated that oxic environments promoted the concentrations of Cu and Cd in overlying water compared to the anoxic environments. The exchange fluxes showed that the diffusion of Cu, Cd, Cr, and Pb from sediments was the predominant process in the first 9 days, and a metastable equilibrium state was gradually reached in the later period under anoxic conditions. However, oxic conditions extended the time required to reach metastable equilibrium for Cu over the sediment-water (overlying water) interface (SWI). Although the reducible fractions of Cu, Cd, and Pb accounted for a large proportion of their total levels, the release ability of Cu, Cd, and Pb was limited by the high content of sulfide under anoxic conditions. The RAC values indicated that anoxic environments increased the proportion of acid-soluble fraction. The information obtained from this study highlights the potential risk for re-release of heavy metal from sediments under different redox conditions.
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Affiliation(s)
- Xiaozhu Liu
- Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yanqing Sheng
- Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
| | - Qunqun Liu
- Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Ming Jiang
- Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
- University of Chinese Academy of Sciences, Beijing, China
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14
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Jia Z, Li S, Liu Q, Jiang F, Hu J. Distribution and partitioning of heavy metals in water and sediments of a typical estuary (Modaomen, South China): The effect of water density stratification associated with salinity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 287:117277. [PMID: 34004474 DOI: 10.1016/j.envpol.2021.117277] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 04/11/2021] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
Many estuaries have undergone severe saltwater intrusion in addition to simultaneously experiencing serious heavy metal pollution. To explore the effect of water density stratification associated with saltwater intrusion on the behaviour of heavy metals (Cr, Co, Ni, Cu, Zn, As, Pb, and Cd) in water and sediments, a field survey was conducted in a typical estuary (Modaomen). The content, distribution, and mobility of heavy metals were investigated, as well as the influence of environmental factors on their future. The results showed that Modaomen estuary was characterised by a notable variation in salinity along the estuary, presenting total freshwater upstream, high salinity stratification water in the mouth, and saltwater offshore. Dissolved metals presented a prominent gradient vertically, with 1.2-2.1 times higher in bottom water than in surface water and the highest contents in the highly-stratified bottom water. Elevated salinity and restricted mixing induced by water stratification were likely the causes of this outcome. The distribution of heavy metals in sediments was greatly governed by grain size, Fe/Mn (hydr)oxides, total organic carbon, salinity, and dissolved oxygen. Comprehensive evaluation, combined with total contents and chemical fractions of heavy metals, indicated that internal release from sediments contributed a considerable part to the higher levels of heavy metals in bottom water, particularly for Zn and Pb, which was fully consistent with their status in water body, and elevated salinity and lack of oxygen were likely the primary driving factors. During the phase-partition processes between bottom water and sediments, partitioning coefficients were markedly lower in the highly stratified zone, implying that saltwater intrusion facilitated the mobility and repartitioning processes of metals. Because of increased levels and toxicity of heavy metals in water and extended residence time during saltwater intrusion, the potential damage to the estuarine ecosystem should receive more attention.
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Affiliation(s)
- Zhenzhen Jia
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Shiyu Li
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China
| | - Qiuxin Liu
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Feng Jiang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China
| | - Jiatang Hu
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China.
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15
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Li X, Yang J, Fan Y, Xie M, Qian X, Li H. Rapid monitoring of heavy metal pollution in lake water using nitrogen and phosphorus nutrients and physicochemical indicators by support vector machine. CHEMOSPHERE 2021; 280:130599. [PMID: 33940448 DOI: 10.1016/j.chemosphere.2021.130599] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 03/26/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
A novel method of predicting heavy metal concentration in lake water by support vector machine (SVM) model was developed, combined with low-cost, easy to obtain nutrients and physicochemical indicators as input variables. 115 surface water samples were collected from 23 sites in Chaohu Lake, China, during different hydrological periods. The particulate concentrations of heavy metals in water were much higher than the dissolved concentrations. According to Nemerow pollution index (Pi), pollution degrees by Fe, V, Mn and As ranged from heavy (2 ≤ Pi < 4) to serious (Pi ≥ 4). The concentrations of most heavy metals were the highest during the medium-water period and the lowest during the dry season. Non-metric Multidimensional Scaling Analysis confirmed heavy metal concentrations had slight spatial difference but relatively large seasonal variation. Redundancy Analysis indicated the close associations of heavy metals with nutrient and physicochemical indicators. When both nutrient and physicochemical indicators were used as input variables, the simulation effects for most elements in total and particulate were relatively better than those obtained using only nutrient or only physicochemical indicators. The simulation effects for As, Ba, Fe, Ti, V and Zn were generally good, based on their training R values of 0.847, 0.828, 0.856, 0.867, 0.817 and 0.893, respectively, as well as their test R values of 0.811, 0.836, 0.843, 0.873, 0.829 and 0.826, respectively; and meanwhile, in both the training and test stages, these metals also had relatively lower errors. The spatial distribution of heavy metals in Chaohu Lake was then predicted using the fully trained SVM models.
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Affiliation(s)
- Xiaolong Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China; School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, PR China
| | - Jinxiang Yang
- School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, PR China
| | - Yifan Fan
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Mengxing Xie
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Xin Qian
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China.
| | - Huiming Li
- School of Environment, Nanjing Normal University, Nanjing, 210023, PR China.
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16
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Hou S, Dong H, Du X, Feng L. Early warning on risk development in compound lead and cadmium contaminated sites. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126174. [PMID: 34492949 DOI: 10.1016/j.jhazmat.2021.126174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/17/2021] [Accepted: 05/18/2021] [Indexed: 06/13/2023]
Abstract
Based on the transformation among metal fractions defined by the Tessier sequential extraction procedure and integrated risk information assessed by delayed geochemical hazard (DGH) methodology, including development paths and their burst probabilities, trigger conditions, and the contribution of each metal to risk development, an approach was proposed to provide an early warning on risk development in metal compound-contaminated sites and tested in a lead and cadmium-contaminated site. Risk assessment indicated that the site was at a high to extremely high ecological risk. DGH analysis revealed that the transformation from the fraction bound to carbonate and organic matter to the exchangeable fraction was dominant in the development of either single or combined lead and cadmium risk, which was triggered by soil acidification and the continuous decline of soil organic matter; risk development might have occurred in 6.52-80.4% of the case site with burst probabilities of 6.52-80.4%, 8.70-39.1% and 8.70-80.4% for lead risk, cadmium risk and combined lead-cadmium risk, respectively; with the dominant role of lead, the two metals overall accelerated the development of their compound risk by changing each other's DGH paths. The proposed DGH-based approach is promising for early warning on risk development in compound contaminated sites.
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Affiliation(s)
- Shu Hou
- Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Haochen Dong
- Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China; Division of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto 6158540, Japan
| | - Xiaokun Du
- Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Liu Feng
- Department of Environmental Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
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17
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Jacob-Tatapu KJ, Albert S, Grinham A. Sediment arsenic hotspots in an abandoned tailings storage facility, Gold Ridge Mine, Solomon Islands. CHEMOSPHERE 2021; 269:128756. [PMID: 33153844 DOI: 10.1016/j.chemosphere.2020.128756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 10/20/2020] [Accepted: 10/22/2020] [Indexed: 06/11/2023]
Abstract
Gold mining of arsenopyrite ore bodies result in waste tailings that contain elevated levels of arsenic. Disposal of these wastes in a Tailings Storage Facility (TSF) represents a substantial environmental risk if not properly managed. The Gold Ridge mine on Guadalcanal, in the Solomon Islands was abandoned from 2014 to 2018, leaving the TSF with little ongoing environmental management. Surface water quality monitoring observed a threefold increase in surface water arsenic concentrations over a 6-month period when no mining operations were occurring. This study aimed to investigate bottom sediments as the source of elevated concentrations of arsenic in the surface waters of the TSF during mine closure. This was achieved by analysing arsenic concentrations in the surface water, sediment porewaters and by quantifying sediment arsenic flux as dissolved oxygen availability declined. It was evident that bottom sediments of the TSF were the potential source of arsenic, having an average arsenic concentration of 437.9 mg kg-1. In addition, average sediment porewater arsenic concentrations across the TSF were 1.07 mg L-1, with a large central zone of highly elevated concentrations peaking at over 17 mg L-1. Long term sediment core incubations demonstrated arsenic effluxes from all sites monitored under both oxic and hypoxic conditions, ranging from 0.72 mg m-2 day-1 to 7.01 mg m-2 day-1 respectively. These results suggest that arsenic hotspots within the TSF have the capability to contribute to increased arsenic concentrations in surface waters. Management of mine TSF's should consider these geochemical interactions that can occur in abandoned sites.
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Affiliation(s)
- Krista J Jacob-Tatapu
- Mines Division, Ministry of Mines, Energy and Rural Electrification, Solomon Islands Government, Solomon Islands
| | - Simon Albert
- School of Civil Engineering, The University of Queensland, St Lucia, Brisbane, 4072, Australia.
| | - Alistair Grinham
- School of Civil Engineering, The University of Queensland, St Lucia, Brisbane, 4072, Australia
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18
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Zhi W, Feng D, Tsai WP, Sterle G, Harpold A, Shen C, Li L. From Hydrometeorology to River Water Quality: Can a Deep Learning Model Predict Dissolved Oxygen at the Continental Scale? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:2357-2368. [PMID: 33533608 DOI: 10.1021/acs.est.0c06783] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Dissolved oxygen (DO) reflects river metabolic pulses and is an essential water quality measure. Our capabilities of forecasting DO however remain elusive. Water quality data, specifically DO data here, often have large gaps and sparse areal and temporal coverage. Earth surface and hydrometeorology data, on the other hand, have become largely available. Here we ask: can a Long Short-Term Memory (LSTM) model learn about river DO dynamics from sparse DO and intensive (daily) hydrometeorology data? We used CAMELS-chem, a new data set with DO concentrations from 236 minimally disturbed watersheds across the U.S. The model generally learns the theory of DO solubility and captures its decreasing trend with increasing water temperature. It exhibits the potential of predicting DO in "chemically ungauged basins", defined as basins without any measurements of DO and broadly water quality in general. The model however misses some DO peaks and troughs when in-stream biogeochemical processes become important. Surprisingly, the model does not perform better where more data are available. Instead, it performs better in basins with low variations of streamflow and DO, high runoff-ratio (>0.45), and winter precipitation peaks. Results here suggest that more data collections at DO peaks and troughs and in sparsely monitored areas are essential to overcome the issue of data scarcity, an outstanding challenge in the water quality community.
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Affiliation(s)
- Wei Zhi
- Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Dapeng Feng
- Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Wen-Ping Tsai
- Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Gary Sterle
- Department of Natural Resources & Environmental Science, The University of Nevada, Reno, Nevada 89557, United States
| | - Adrian Harpold
- Department of Natural Resources & Environmental Science, The University of Nevada, Reno, Nevada 89557, United States
| | - Chaopeng Shen
- Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Li Li
- Department of Civil and Environmental Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, United States
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19
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Chen M, Ding S, Li C, Tang Y, Fan X, Xu H, Tsang DCW, Zhang C. High cadmium pollution from sediments in a eutrophic lake caused by dissolved organic matter complexation and reduction of manganese oxide. WATER RESEARCH 2021; 190:116711. [PMID: 33296734 DOI: 10.1016/j.watres.2020.116711] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/05/2020] [Accepted: 11/29/2020] [Indexed: 06/12/2023]
Abstract
Eutrophication and metal pollution are global environmental problems. The risk of metal pollution is high in the eutrophic lakes because of high mobility of metal in sediments. However, the mechanism of cadmium (Cd) mobility in sediments is still unclear. Here we study the mobilization of Cd in sediments from the eutrophic Lake Taihu via monthly field monitoring of mobile Cd using diffusive gradient in thin films (DGT) and high resolution dialysis (HR-Peeper) techniques. We found a high mobility of Cd in sediments in February and March, resulting from reductive dissolution of Mn oxide mediation by high microbial activities, as shown by the similarities in distribution patterns of DGT-labile Cd and Mn. A two orders of magnitude increase in dissolved Cd concentrations (about 28 μg L-1) was observed in May and June, with dissolved Cd concentrations in overlying water about 110 times higher than the criteria continuous concentration set by Environmental Protection Agency. Hourly changes were found to coincide and correlate between dissolved Cd and dissolved organic matter (DOM) under simulated anaerobic conditions, strongly suggesting that the sudden outbreak of Cd pollution observed in the field resulted from the complexation of DOM with Cd in sediments. This was further supported by the NICA-Donnan model that more than 71% of dissolved Cd in the pore water in May and June was present as Cd-DOM complexes. Three components of DOM including humic-, tryptophan-, and tyrosine-like components in the sediments in June was identified using the fluorescence excitation emission matrix-parallel factor analysis. We found that Cd was stable complexed with tyrosine-like component. The Fourier transform infrared and two-dimensional correlation spectroscopy further revealed that Cd was bound to phenolic OH, alkene CC, alcoholic CO, aromatic CH, and alkene CH groups. Our study effectively promotes the understanding of Cd mobilization in sediments and highlights the risk of sudden Cd pollution events in the eutrophic lakes.
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Affiliation(s)
- Musong Chen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
| | - Cai Li
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Yazhou Tang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Xianfang Fan
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Huacheng Xu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Chaosheng Zhang
- International Network for Environment and Health, School of Geography and Archaeology, National University of Ireland, Galway, Ireland
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20
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Ren M, Ding S, Dai Z, Wang J, Li C, Zhong Z, Cao J, Yang L, Tsang DCW, Xu S, Yang C, Wang Y. A new DGT technique comprising a hybrid sensor for the simultaneous high resolution 2-D imaging of sulfides, metallic cations, oxyanions and dissolved oxygen. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123597. [PMID: 32781278 DOI: 10.1016/j.jhazmat.2020.123597] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 07/26/2020] [Accepted: 07/27/2020] [Indexed: 06/11/2023]
Abstract
A new diffusive gradients in thin films technique (HR-ZCA DGT) was developed for simultaneous two-dimensional (2-D) chemical imaging of sulfides, metallic cations and oxyanions (S, Cd, Co, Fe, Cu, Mn, Ni, Pb, Zn, As, Cr, Mo, Sb, Se, V, P and W) at the submillimeter scale, combined with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis. A novel binding gel was prepared using a double precipitation method with AgI and zirconium oxide (Zr-oxide) deposited sequentially on a preformed Chelex-100 resin gel. A good linear relationship was observed (R2>0.99) between mass accumulation of the 17 assessed elements on the binding gel and the corresponding standardized laser ablation signals (signals of elements divided by signals of internal standard 13C), proving the feasibility of LA-ICP-MS analysis. Good analytical precision (RSD<12 %) was achieved for all 17 elements. A hybrid sensor comprising the novel DGT binding gel overlying an O2 planar optrode was then tested in sediments to evaluate the dynamics of O2 and multiple elements. Results showed that the mobility of As, P and W were controlled by precipitation/dissolution processes with Fe/Mn oxides. V, Co, Ni, Zn, Mo, Cd and Sb were released at the sediment surface with the oxidation of iron sulfides.
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Affiliation(s)
- Mingyi Ren
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China.
| | - Zhihui Dai
- State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
| | - Jingfu Wang
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Cai Li
- School of Resources and Environment, University of Jinan, Jinan 250022, China
| | - Zhilin Zhong
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingxin Cao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liyuan Yang
- School of Resources and Environment, University of Jinan, Jinan 250022, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong China
| | - Shiwei Xu
- Central Laboratory, Jiangsu Academy of Agricultural Science, Nanjing 210008, China
| | - Chenye Yang
- Central Laboratory, Jiangsu Academy of Agricultural Science, Nanjing 210008, China
| | - Yan Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China
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21
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Nędzarek A, Czerniejewski P, Tórz A. A comparison of the concentrations of heavy metals in modern and medieval shells of swollen river mussels (Unio tumidus) from the Szczecin Lagoon, SW Baltic basin. MARINE POLLUTION BULLETIN 2021; 163:111959. [PMID: 33450444 DOI: 10.1016/j.marpolbul.2020.111959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/24/2020] [Accepted: 12/19/2020] [Indexed: 06/12/2023]
Abstract
The shells of mussels, live-collected bivalves or during archaeological excavations, can be used as bioindicators of current and historical levels of heavy metal contamination. In this study, we examined the shells of Unio tumidus, commonly found in the Baltic Sea region, and determined the concentrations of Zn, Cu, Fe, Pb, Ni, and Cd in samples from the 10th, 11th, and 21st century from the area of the Szczecin Lagoon. The average levels of heavy metals (in μg g-1 dry weight) in the shells from the Middle Ages were: 137.5 (Fe), 3.87 (Zn), 0.789 (Cu), 0.012 (Pb), 0.047 (Ni), and 0.0009 (Cd). Shells from the 21st century were significantly (P<0.05) more abundant in Fe, Cu, Ni, Pb, and Cd (rates of increase: 1.96×, 3.54×, 2.71×, 2.08×, and 3.55×, respectively) than shells from the Middle Ages. These results reflect contemporary anthropogenic pollution of the environment with heavy metals and confirm the possibility of using U. tumidus shells in the assessment of heavy metal pollution levels.
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Affiliation(s)
- Arkadiusz Nędzarek
- West Pomeranian University of Technology in Szczecin, Faculty of Food Sciences and Fisheries, Kazimierza Królewicza Street 4, 71-550 Szczecin, Poland.
| | - Przemysław Czerniejewski
- West Pomeranian University of Technology in Szczecin, Faculty of Food Sciences and Fisheries, Kazimierza Królewicza Street 4, 71-550 Szczecin, Poland.
| | - Agnieszka Tórz
- West Pomeranian University of Technology in Szczecin, Faculty of Food Sciences and Fisheries, Kazimierza Królewicza Street 4, 71-550 Szczecin, Poland.
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22
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Hu Y, He N, Wu M, Wu P, He P, Yang Y, Wang Q, Wang M, Fang S. Sources and ecological risk assessment of the seawater potentially toxic elements in Yangtze River Estuary during 2009-2018. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:44. [PMID: 33410980 DOI: 10.1007/s10661-020-08795-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Accepted: 12/10/2020] [Indexed: 06/12/2023]
Abstract
The purpose of this paper is to understand the sources of potentially toxic elements (PTE) and provide some suggestions to control PTE pollution. For this purpose, data from 30 monitoring stations for 2009-2018 were used to assess the PTE concentrations of Hg, Cu, Pb, Cd, Zn, and As in the Yangtze River Estuary. The PTE concentrations varied significantly (P < 0.05) by one-way ANOVA in the ranges of 0.002-0.224 (Hg, 0.043 ± 0.032), 0-9.700 (Cu, 1.600 ± 1.000), 0-3.900 (Pb, 1.000 ± 0.700), 0.002-0.370 (Cd, 0.050 ± 1.000), 0.100-85.000 (Zn, 14.000 ± 13.000), and 0.998-3.290 μg/L (As, 1.857 ± 0.455). Generally, the PTE concentrations decreased from year to year and were consistently satisfied the "grade-one seawater" quality standard after 2014. The concentrations of Cu, Cd, Zn, and As decreased as far from inshore, while increased closer to land in the estuary. Concentrations of Pb and Hg showed differences because of local industrial and aquacultural activities. This study identified three clusters and two PTE sources and provided some constructive suggestions for pollution control in PTE.
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Affiliation(s)
- Yang Hu
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
| | - Ning He
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
| | - Mingxuan Wu
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
- Fisheries and Life Science School, Shanghai Ocean University, Shanghai, 201306, China
| | - Pengling Wu
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
| | - Peimin He
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
- Research Center of Water Environment and Ecological Engineering, Shanghai Ocean University, Shanghai, 201306, China
| | - Ying Yang
- East China Sea Environmental Monitoring Center, SOA, Shanghai, 200137, China
| | - Qinyi Wang
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
| | - Maoqiu Wang
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China
| | - Shubo Fang
- College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China.
- Research Center of Water Environment and Ecological Engineering, Shanghai Ocean University, Shanghai, 201306, China.
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23
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Jaiswal D, Pandey J. River ecosystem resilience risk index: A tool to quantitatively characterize resilience and critical transitions in human-impacted large rivers. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 268:115771. [PMID: 33069044 DOI: 10.1016/j.envpol.2020.115771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 09/21/2020] [Accepted: 10/01/2020] [Indexed: 06/11/2023]
Abstract
Riverine ecosystems can have tipping points at which the system shifts abruptly to alternate states, although quantitative characterization is extremely difficult. Here we show, through critical analysis of two different reach scale (25 m and 50 m) studies conducted downstream of two point sources, two tributaries (main stem and confluences) and a 630 km segment of the Ganga River, that human-driven benthic hypoxia/anoxia generates positive feedbacks that propels the system towards a contrasting state. Considering three positive feedbacks-denitrification, sediment-P- and metal-release as level determinants and extracellular enzymes (β-D-glucosidase, protease, alkaline phosphatase and FDAase) as response determinants, we constructed a 'river ecosystem resilience risk index (RERRI)' to quantitatively characterize tipping points in large rivers. The dynamic fit intersect models indicated that the RERRI<4 represents a normal state, 4-18 a transition where recovery is possible, and >18 an overstepped condition where recovery is not possible. The resilience risk index, developed for the first time for a lotic ecosystem, can be a useful tool for understanding the tipping points and for adaptive and transformative management of large rivers.
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Affiliation(s)
- Deepa Jaiswal
- Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Jitendra Pandey
- Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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24
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Jaiswal D, Pandey J. Benthic hypoxia in anthropogenically-impacted rivers provides positive feedback enhancing the level of bioavailable metals at sediment-water interface. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 258:113643. [PMID: 31784273 DOI: 10.1016/j.envpol.2019.113643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 10/15/2019] [Accepted: 11/16/2019] [Indexed: 06/10/2023]
Abstract
We investigated the effect of hypoxic-anoxic range of dissolved oxygen (DO) on metal release/bioavailability at sediment-water interface (SWI) in the Ganga River. Here, we consider eight sites in the main river stem along 518 km; sixty sites downstream two point sources and two tributary confluences covering 630 km; and an incubation experiment to verify these results. We found higher concentrations of metals and bioavailable fractions at SWI at two locations of main stem and up to 700 m, 1000 m, 400 m and 500 m downstream Assi drain, Wazidpur drain, Ramganga confluence and Varuna confluence respectively where DO at SWI (DOsw) was <2.0 mgL-1. The incubation experiment did show higher levels of metal- and P-release and bioavailability under anoxic-hypoxic range of DO. The risk assessment code and eutrophication index indicated high to very high risks of contaminated river sediment and water to aquatic environment at sites with hypoxic-anoxic range of DOsw. Further, the principal component analyses separated metals and bioavailable fractions opposite to FDAase indicating greater risk at these locations. The study, which forms the first report on benthic hypoxia/anoxia-driven metal release, potential bioavailability and risk to the Ganga River ecosystem will help understanding how human-driven perturbations influence geochemical cycling of metals and ecosystem responses in large rivers.
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Affiliation(s)
- Deepa Jaiswal
- Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Jitendra Pandey
- Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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25
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Pan F, Liu H, Guo Z, Cai Y, Fu Y, Wu J, Wang B, Gao A. Metal/metalloid and phosphorus characteristics in porewater associated with manganese geochemistry: A case study in the Jiulong River Estuary, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 255:113134. [PMID: 31520910 DOI: 10.1016/j.envpol.2019.113134] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 08/17/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Sediment porewater can be an important source of contaminants in the overlying water, but the mechanisms of metal(loid) and phosphorus (P) remobilization remain to be investigated. In this study, high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) samplers were used to determine the porewater dissolved iron (Fe), manganese (Mn), cobalt (Co), chromium (Cr), vanadium (V), selenium (Se), arsenic (As), P and DGT-Labile S in coastal sediments in the Jiulong River Estuary (JRE), China. The results showed that high concentrations of dissolved Mn, Se and P were present in the overlying water, indicating potential water pollution with excessive amounts of Mn, Se and P. The dissolved Mn concentrations in the porewater were higher than the dissolved Fe concentrations, especially at submerged sites, demonstrating that Mn(III/IV) reduction is the dominant diagenetic pathway for organic carbon (OC) degradation, which directly affects Fe cycling by the competitive inhibition of Fe(III) reduction and Fe(II) reoxidation. Dissolved Co, Cr, V, Se, As and P show significant positive correlations with Mn but nearly no correlations with Fe, suggesting that the mobility of these metal(loid)s and P is associated with Mn but not Fe cycling in this region. In addition, the coelevated concentrations of the metal(loid)s, P and Mn at the submerged sites are attributed to the strengthened Mn reduction coupled with OC degradation fueled by hypoxia. The higher positive diffusion fluxes of Mn, Se and P were consistent with the excess Mn, Se and P concentrations in the overlying water, together with the approximately positive fluxes of the other metal(loid)s, indicating that sediment Mn(III/IV) reduction and concomitant metal(loid) and P remobilization might be vital pathways for metal(loid) and P migration to the overlying water.
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Affiliation(s)
- Feng Pan
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Huatai Liu
- College of the Environment and Ecology, Xiamen University, Xiamen 361102, PR China.
| | - Zhanrong Guo
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Yu Cai
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Yuyao Fu
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Jinye Wu
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Bo Wang
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China
| | - Aiguo Gao
- College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, PR China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, PR China
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26
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Broman E, Motwani NH, Bonaglia S, Landberg T, Nascimento FJA, Sjöling S. Denitrification responses to increasing cadmium exposure in Baltic Sea sediments. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2019; 217:105328. [PMID: 31629202 DOI: 10.1016/j.aquatox.2019.105328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 10/04/2019] [Accepted: 10/05/2019] [Indexed: 06/10/2023]
Abstract
Benthic ecosystems have come under intense pressure, due to eutrophication-driven oxygen decline and industrial metal contamination. One of the most toxic metals is Cadmium (Cd), which is lethal to many aquatic organisms already at low concentrations. Denitrification by facultative anaerobic microorganisms is an essential process to transform, but also to remove, excess nitrate in eutrophied systems. Cd has been shown to decrease denitrification and sequester free sulfide, which is available when oxygen is scarce and generally inhibits complete denitrification (i.e. N2O to N2). In polluted sediments, an interaction between oxygen and Cd may influence denitrification and this relationship has not been studied. For example, in the Baltic Sea some sediments are double exposed to both Cd and hypoxia. In this study, we examined how the double exposure of Cd and fluctuations in oxygen affects denitrification in Baltic Sea sediment. Results show that oxygen largely regulated N2O and N2 production after 21 days of exposure to Cd (ranging from 0 to 500 μg/L, 5 different treatments, measured by the isotope pairing technique (IPT)). In the high Cd treatment (500 μg/L) the variation in N2 production increased compared to the other treatments. Increases in N2 production are suggested to be an effect of 1) enhanced nitrification that increases NO3- availability thus stimulating denitrification, and 2) Cd successfully sequestrating sulfide (yielding CdS), which allows for full denitrification to N2. The in situ field sediment contained initially high Cd concentrations in the pore water (∼10 μg/L) and microbial communities might already have been adapted to metal stress, making the effect of low Cd levels negligible. Here we show that high levels of cadmium pollution might increase N2 production and influence nitrogen cycling in marine sediments.
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Affiliation(s)
- Elias Broman
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, 106 91, Sweden; Baltic Sea Centre, Stockholm University, Stockholm, 106 91, Sweden.
| | - Nisha H Motwani
- School of Natural Sciences, Technology and Environmental Studies, Södertörn University, Huddinge, 141 89, Sweden
| | - Stefano Bonaglia
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, 106 91, Sweden; Department of Biology, University of Southern Denmark, Odense, 5230, Denmark
| | - Tommy Landberg
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, 106 91, Sweden
| | - Francisco J A Nascimento
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, 106 91, Sweden; Baltic Sea Centre, Stockholm University, Stockholm, 106 91, Sweden
| | - Sara Sjöling
- School of Natural Sciences, Technology and Environmental Studies, Södertörn University, Huddinge, 141 89, Sweden
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27
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Sun Q, Lin J, Ding S, Gao S, Gao M, Wang Y, Zhang C. A comprehensive understanding of enhanced Pb mobilization in sediments caused by algal blooms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 691:969-980. [PMID: 31326819 DOI: 10.1016/j.scitotenv.2019.07.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 07/09/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
A good understanding of lead (Pb) mobilization in eutrophic lakes is a key to the accurate assessment of Pb pollution. In this work, dissolved and labile Pb was determined by both high resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) in sediment-water profiles of the hyper-eutrophic Meiliang Bay of Lake Taihu on a monthly basis during one year. The drinking water standards for dissolved Pb of the World Health Organization (10μg/L) and those of China were exceeded in the overlying water (20.79-118.5μg/L). Out of which, a total of five months even exceeded the fisheries water quality limitation (50μg/L) in China. The algal blooms created an anaerobic environment in the surface sediments in July. The reductive conditions led to the dissolution of Fe/Mn and this caused the release of Pb, followed by organic matter complexation. This was supported by the coincident changes of dissolved Pb with dissolved organic matter (DOM) in sediments under anaerobic incubation. Algae residue decomposition in October caused another distinct release of Pb, but this process should be considerably suppressed by increased sulfide precipitation and pyrite adsorption of Pb ion. These results indicated that Pb mobilization in sediments can be significantly enhanced by algal blooms in eutrophic lakes, indicating that further attention should be paid to Pb pollution in waters with harmful algal blooms.
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Affiliation(s)
- Qin Sun
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Juan Lin
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Shuaishuai Gao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mingrui Gao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Yan Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China
| | - Chaosheng Zhang
- International Network for Environment and Health, School of Geography and Archaeology and Ryan Institute, National University of Ireland, Galway, Ireland
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28
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Zhuang W, Ying SC, Frie AL, Wang Q, Song J, Liu Y, Chen Q, Lai X. Distribution, pollution status, and source apportionment of trace metals in lake sediments under the influence of the South-to-North Water Transfer Project, China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 671:108-118. [PMID: 30928740 DOI: 10.1016/j.scitotenv.2019.03.306] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 03/19/2019] [Accepted: 03/20/2019] [Indexed: 06/09/2023]
Abstract
In an effort to combat the threat of drought, China constructed the South-to-North Water Transfer Project (SNWTP), the biggest water transfer project in terms of volume with the largest beneficiary population in the world. Reports have shown that massive water diversion projects have had detrimental environmental consequences including water quality decline and freshwater habitat degradation. However, few reports have assessed the impact of the transfer project on sediment quality, which is highly susceptible to allogenic and local anthropogenic pollution. We examined the distribution characteristics of Cd, Cr, Cu, Ni, Pb and Zn in surface sediment of the largest reservoir along the East Route of SNWTP, Nansihu Lake, followed by positive matrix factorization (PMF) to determine their potential sources. We utilized enrichment factor, multiple sediment quality guidelines (SQGs), and potential ecological risk index (RI) to determine metal accumulation or pollution risk. The results show the mean concentrations of Cr, Cu, Pb, Zn were slightly lower than in samples collected in 2003, 2010 and 2012, while the mean concentrations of Cr and Ni were significantly higher than samples from previous years. Among the six metals, Cr, Cu and Ni are of higher ecological risk according to SQGs; but Cd is of higher ecological risk according to RI. PMF analysis shows that industrial production and shipping are important sources of Cr, Cu, and Ni. PMF analysis also shows that a considerable amount of trace metals, especially Cd, Cr, Pb and Zn, mainly comes from the use of pesticide fertilizers and biomass sources in farmland, and may partly enter Nansihu Lake from SNWTP. This study reveals the possible sources of trace metals to the Nansihu Lake which is part of SNWTP; the results of the study may serve as a reference for better understanding the impact of future water diversion projects on metals distribution.
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Affiliation(s)
- Wen Zhuang
- Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China; Department of Environmental Sciences, University of California, Riverside, CA 92521, United States; College of City and Architecture Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China.
| | - Samantha C Ying
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Alexander L Frie
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Qian Wang
- College of City and Architecture Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China
| | - Jinming Song
- Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China
| | - Yongxia Liu
- College of City and Architecture Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China
| | - Qing Chen
- College of Life Sciences, Zaozhuang University, Zaozhuang, Shandong 277160, China
| | - Xiaoying Lai
- National Engineering and Technology Research Center for Development & Utilization of Phosphorous Resources, Wuhan Institute of Technology, Wuhai, Hubei 430073, China
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29
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Liu JJ, Diao ZH, Xu XR, Xie Q. Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 666:894-901. [PMID: 30818213 DOI: 10.1016/j.scitotenv.2019.02.288] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/06/2019] [Accepted: 02/18/2019] [Indexed: 06/09/2023]
Abstract
Great amounts of nutrients discharged into the urbanized coastal areas, which are continuously subject to violently anthropogenic metal contamination, will result in eutrophication and hypoxic episode. In order to study the effects of dissolved oxygen (DO), salinity, nitrogen and phosphorus on the release of six metals including Zn, Pb, Cd, Cu, As and Cr from coastal sediments, a series of 60-days microcosm experiments consisting of sediments and seawater were conducted. Severe hypoxia could result in the enhanced peak values of Pb, Cd, Cu and Cr concentrations in the overlying water. A higher level of water salinity could elevate the peak value of As concentration in water column, and a higher level of nitrogen could increase the peak value of Zn concentration in water. The exchange fluxes demonstrated that the diffusion from the sediments was a dominant process during the first 10 days, However, a relative equilibrium of adsorption and precipitation in the sediment-water interface reached during the later periods. In addition, the bioavailability of the studied metals in sediments was elevated under severe hypoxia, or a high level of water salinity, or high levels of nitrogen and phosphorus. The results of linear regression analysis suggested that higher metal bioavailability in sediments could facilitate the metal release, but the process could be restrained by the higher aqueous phosphorus due to the precipitation of metal phosphates.
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Affiliation(s)
- Jin-Jun Liu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zeng-Hui Diao
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
| | - Xiang-Rong Xu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China.
| | - Qun Xie
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; Guangdong Ocean University, Zhanjiang 524000, China; University of Chinese Academy of Sciences, Beijing 100049, China
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30
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Chen M, Ding S, Gao S, Xu S, Yang C, Wu Y, Gong M, Wang D, Wang Y. Long-term effects of sediment dredging on controlling cobalt, zinc, and nickel contamination determined by chemical fractionation and passive sampling. CHEMOSPHERE 2019; 220:476-485. [PMID: 30594799 DOI: 10.1016/j.chemosphere.2018.12.138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/19/2018] [Accepted: 12/18/2018] [Indexed: 06/09/2023]
Abstract
Studies of dredging effectiveness, especially the ones that last for several years, are scarce. In this study, we evaluated effectiveness of dredging performed for six years on controlling cobalt (Co), zinc (Zn), and nickel (Ni) contamination of sediments. High-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) methods were applied to analyze the non-dredged and post-dredging sediments. The soluble and DGT-labile Co and Ni content declined by 22% and 44% (soluble) and by 16% and 26% (labile) in April, July and October in the post-dredging region. In contrast, their concentrations increased by 105% and 9% (soluble) and 322% and 27% (labile) in January. These changes in the dredging effects were caused by the corresponding changes in the reducible and residual fractions of Co and the residual fraction of Ni in sediments in the dredged site, respectively. Soluble and DGT-labile Zn decreased on average by 23% and 29% in July and October and increased on average by 151% and 52% in April and January in the post-dredging region. The different Zn mobility in the post-dredging region was controlled by the reducible fraction of Zn. The results revealed positive influence of dredging engineering in summer, autumn and/or spring and negative one in winter. Therefore, an accurate assessment of dredging effectiveness should take its seasonal variation into consideration.
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Affiliation(s)
- Musong Chen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Shiming Ding
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Shuaishuai Gao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shiwei Xu
- Central Laboratory, Jiangsu Academy of Agricultural Science, Nanjing 210008, China
| | - Chenye Yang
- Central Laboratory, Jiangsu Academy of Agricultural Science, Nanjing 210008, China
| | - Yuexia Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Mengdan Gong
- Shanghai Water Source Construction Development Co., Ltd., Shanghai 200437, China
| | - Dan Wang
- Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China
| | - Yan Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China
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31
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Kang M, Tian Y, Peng S, Wang M. Effect of dissolved oxygen and nutrient levels on heavy metal contents and fractions in river surface sediments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 648:861-870. [PMID: 30142604 DOI: 10.1016/j.scitotenv.2018.08.201] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 08/13/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
In aquatic systems worldwide, heavy metal pollution has been increasing alongside rapidly growing anthropogenic activities, and most heavy metals are stored in sediments. Overlying water conditions may influence whether sediments act as heavy metal sinks or sources. In this study, we investigated the effects of the dissolved oxygen (DO) and nutrient levels of overlying water on the total contents and fractions of Pb, Zn, Ni, Cu, Mo, and Fe in river surface sediments. Sediments and overlying water were collected from a tributary of the Hai River in Tianjin, China, and then incubated for 61 days under laboratory conditions. The chemical speciation of heavy metals was determined following the modified Community Bureau of Reference (BCR) three-step sequential extraction procedure. The results showed that Pb, Zn, and Fe were released from the sediments in an anoxic environment and adsorbed from the overlying water in an aerobic environment. High nutrient levels facilitated the adsorption of Pb, Zn, Cu, and Fe in the sediments, while the total content of Mo was higher under low nutrient level conditions. The DO and nutrient levels appeared to have no influence on the total content of Ni. According to the risk assessment code classification (RAC), anoxic conditions decrease the potential bioavailability risks of Pb, Zn, Ni, Cu, Mo, and Fe. Anoxic conditions can also reduce the percentage of the potentially mobile fractions of Pb, Zn, Cu, and Fe. The low nutrient level contributed, to some extent, to reducing the potential bioavailability risk of Pb, but increasing the risk of Cu. The high nutrient level increased the potentially mobile fractions of Pb, Zn, Cu, and Fe. The information obtained in this study improves our scientific understanding of the effects of overlying water conditions on the total heavy metal contents and fractions.
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Affiliation(s)
- Mengxin Kang
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, China; College of Architecture Engineering, Northeast Electric Power University, 169 Changchun Road, Jilin 132012, China
| | - Yimei Tian
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, China.
| | - Sen Peng
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, China
| | - Mengqi Wang
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, China
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Li B, Peng L, Wei D, Lei M, Liu B, Lin Y, Li Z, Gu J. Enhanced flocculation and sedimentation of trace cadmium from irrigation water using phosphoric fertilizer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 601-602:485-492. [PMID: 28575827 DOI: 10.1016/j.scitotenv.2017.05.160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/16/2017] [Accepted: 05/17/2017] [Indexed: 06/07/2023]
Abstract
Suspended substrate (SS) in natural waters controls the interaction, transportation, and biological effects of heavy metals in water bodies. The large amount of cadmium (Cd) carried by SS is an important source of Cd pollution in irrigation water. In this study, a novel procedure to remove trace Cd coexisting with SS from irrigation water by fertilizer flocculation was investigated. Four common fertilizers (K2HPO4, (NH4)2HPO4, KH2PO4, and K2SO4) were used as flocculants. Batch experiments with various fertilizers revealed that the removal efficiency followed the order: K2HPO4>(NH4)2HPO4>KH2PO4>K2SO4. When levels of K2HPO4 higher than 0.75g/L were applied, the total Cd decreased from 20 to 3.8μg/L after 12h of flocculation, i.e., the removal efficiency reached 80%. The mechanism analysis(Zeta potential, multi-element analysis) results demonstrated that the aggregation of SS and its sedimentation by K2HPO4 were due to the combined effect of the oxidation of Fe2+ to Fe3+ and cation binding behavior towards SS, as a result of charge neutralization and electric double layer compression. This method of Cd removal from irrigation water is simple and has the potential to be applied in agricultural production.
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Affiliation(s)
- Bingyu Li
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Liang Peng
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China.
| | - Dongning Wei
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Ming Lei
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Bin Liu
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Yiqing Lin
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Zhiyi Li
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, PR China
| | - Jidong Gu
- Laboratory of Environmental Microbiology and Toxicology, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR, PR China
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Dang H, Chen CTA. Ecological Energetic Perspectives on Responses of Nitrogen-Transforming Chemolithoautotrophic Microbiota to Changes in the Marine Environment. Front Microbiol 2017; 8:1246. [PMID: 28769878 PMCID: PMC5509916 DOI: 10.3389/fmicb.2017.01246] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 06/20/2017] [Indexed: 11/15/2022] Open
Abstract
Transformation and mobilization of bioessential elements in the biosphere, lithosphere, atmosphere, and hydrosphere constitute the Earth’s biogeochemical cycles, which are driven mainly by microorganisms through their energy and material metabolic processes. Without microbial energy harvesting from sources of light and inorganic chemical bonds for autotrophic fixation of inorganic carbon, there would not be sustainable ecosystems in the vast ocean. Although ecological energetics (eco-energetics) has been emphasized as a core aspect of ecosystem analyses and microorganisms largely control the flow of matter and energy in marine ecosystems, marine microbial communities are rarely studied from the eco-energetic perspective. The diverse bioenergetic pathways and eco-energetic strategies of the microorganisms are essentially the outcome of biosphere-geosphere interactions over evolutionary times. The biogeochemical cycles are intimately interconnected with energy fluxes across the biosphere and the capacity of the ocean to fix inorganic carbon is generally constrained by the availability of nutrients and energy. The understanding of how microbial eco-energetic processes influence the structure and function of marine ecosystems and how they interact with the changing environment is thus fundamental to a mechanistic and predictive understanding of the marine carbon and nitrogen cycles and the trends in global change. By using major groups of chemolithoautotrophic microorganisms that participate in the marine nitrogen cycle as examples, this article examines their eco-energetic strategies, contributions to carbon cycling, and putative responses to and impacts on the various global change processes associated with global warming, ocean acidification, eutrophication, deoxygenation, and pollution. We conclude that knowledge gaps remain despite decades of tremendous research efforts. The advent of new techniques may bring the dawn to scientific breakthroughs that necessitate the multidisciplinary combination of eco-energetic, biogeochemical and “omics” studies in this field.
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Affiliation(s)
- Hongyue Dang
- State Key Laboratory of Marine Environmental Science, Institute of Marine Microbes and Ecospheres, College of Ocean and Earth Sciences, Xiamen UniversityXiamen, China
| | - Chen-Tung A Chen
- Department of Oceanography, National Sun Yat-sen UniversityKaohsiung, Taiwan
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Ammar R, Kazpard V, Wazne M, El Samrani AG, Amacha N, Saad Z, Chou L. Reservoir sediments: a sink or source of chemicals at the surface water-groundwater interface. ENVIRONMENTAL MONITORING AND ASSESSMENT 2015; 187:579. [PMID: 26293891 DOI: 10.1007/s10661-015-4791-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 08/12/2015] [Indexed: 06/04/2023]
Abstract
This study delineates the physical, chemical, and biological effects resulting from anthropogenic and endogenic activities in a sensitive dammed reservoir situated in a semi-arid region. The reservoir is characterized by two major flow regimes: a wet fill hydrologic regime and a dry spill one. A seasonal sampling campaign was carried out over a period of 2 years (2011-2013) where water samples were collected across the water column and from piezometers just outside the perimeter of the reservoir. Similarly, sediments were collected from the corresponding areas beneath the water column. The water samples were analyzed for environmental isotopic ratios, elemental composition, and physical, biological and chemical parameters, whereas the sediment and algal samples were subjected to physical, mineralogical, spectroscopic, and microscopic analyses. This investigation indicated that the dam had resulted in the alteration of the biogeochemical cycle of nutrients as well as the degradation of the sediment and water quality. The hydrological and biogeochemical processes were found to induce vertical downward transport of chemicals towards the fine grained calcareous sediments during the fill mode, whereas the sediments acted as a source of a chemical flux upward through the water column and downward towards the groundwater during the spill mode. The geomorphological characteristics of the reservoir enhanced the strong hydrological connectivity between the surface water and the groundwater where the reservoir responded quickly to natural and anthropogenic changes in the upper watershed. The water and sediments in the sensitive spill mode were of poor quality and should receive more attention due to the potential hazard for the associated hydro-project and the sustainability of the agricultural soil in the long term. Thus, a safe water and sediment management plan should be implemented in order to improve the dam functionality and to safeguard the precious water resources.
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Affiliation(s)
- Rawaa Ammar
- Platform for Research and Analysis in Environmental Sciences, Doctoral School of Science and Technology, Faculty of Sciences, Lebanese University, P.O. Box 5, Campus Rafic Hariri, Hadath-Beirut, Lebanon,
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Superville PJ, Prygiel E, Magnier A, Lesven L, Gao Y, Baeyens W, Ouddane B, Dumoulin D, Billon G. Daily variations of Zn and Pb concentrations in the Deûle River in relation to the resuspension of heavily polluted sediments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 470-471:600-607. [PMID: 24176708 DOI: 10.1016/j.scitotenv.2013.10.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 10/03/2013] [Accepted: 10/07/2013] [Indexed: 06/02/2023]
Abstract
Sediments in the Deûle River (northern France) are severely polluted by metals in the vicinity of several metallurgical plants. The aim of this paper is to identify the role played by the recurrent resuspension of these polluted sediments by boat traffic on the dissolved Pb and Zn concentrations in the river. For that purpose, several high-frequency on-line monitoring campaigns were performed. Our results clearly suggest that the resuspension of sedimentary particles into the overlying water significantly increased the dissolved electrolabile Pb and Zn contents. This increase does not persist for a long time because at night and during weekends and holidays, when the boat traffic strongly slows down, Pb and Zn concentrations drop again quickly. Our data also indicate that the biological processes (such as photosynthetic and respiration activities), diffusive and benthic fluxes, as well as dilution of pore water into the overlying water during sediment remobilization do not contribute significantly to the sharp increase of dissolved Pb and Zn concentrations in the river during the day. The good correlation between turbidity and electrolabile metal concentration allows us to discard slow AVS (Acid Volatile Sulfides) oxidation as well. Desorption of metals from sediment particles was clearly the most relevant process, responsible for the increase of dissolved Pb and Zn concentrations in the water column.
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Affiliation(s)
- Pierre-Jean Superville
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France
| | - Emilie Prygiel
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France
| | - Aurélie Magnier
- Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium; IRSTEA, UR MALY, 5 rue de la Doua, CS 70077, 69626 Villeurbanne Cedex, France
| | - Ludovic Lesven
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France
| | - Yue Gao
- Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium
| | - Willy Baeyens
- Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium
| | - Baghdad Ouddane
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France
| | - David Dumoulin
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France
| | - Gabriel Billon
- Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
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Chapman PM, Wang F, Caeiro SS. Assessing and managing sediment contamination in transitional waters. ENVIRONMENT INTERNATIONAL 2013; 55:71-91. [PMID: 23528483 DOI: 10.1016/j.envint.2013.02.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 02/08/2013] [Accepted: 02/18/2013] [Indexed: 06/02/2023]
Abstract
Sediment contamination remains a global problem, particularly in transitional waters such as estuaries and coastal lagoons, which are the recipients of chemicals from multiple near- and far-field sources. Although transitional waters are highly productive ecosystems, approaches for assessing and managing their sediment contamination are not as well developed as in marine and fresh waters. Further, although transitional waters remain defined by their variable and unique natural water quality characteristics, particularly salinity, the biota inhabiting such ecosystems, once thought to be defined by Remane's "paradox of brackish water", are being redefined. The purpose of the present paper is to build on an earlier but now dated (>12years old) review of methods to assess sediment contamination in estuaries, extending this to all transitional waters, including information on integrative assessments and on management decision-making. The following are specifically discussed: chemical assessments; bioindicators; biomarkers; and, biological surveys. Assessment and management of sediment contamination in transitional waters need to be focused on ecosystem services and, where appropriate and possible, be proactive rather than reactive when uncertainty has been suitably reduced.
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Affiliation(s)
- Peter M Chapman
- Golder Associates Ltd., 500-4260 Still Creek Drive, Burnaby, BC V5C 6C6, Canada.
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37
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Banks JL, Ross DJ, Keough MJ, Macleod CK, Keane J, Eyre BD. Influence of a burrowing, metal-tolerant polychaete on benthic metabolism, denitrification and nitrogen regeneration in contaminated estuarine sediments. MARINE POLLUTION BULLETIN 2013; 68:30-37. [PMID: 23398743 DOI: 10.1016/j.marpolbul.2013.01.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 12/28/2012] [Accepted: 01/03/2013] [Indexed: 06/01/2023]
Abstract
We investigated the effects of the burrowing cirratulid polychaete Cirriformia filigera (Delle Chiaje, 1828) on benthic respiration and nitrogen regeneration in metal-contaminated estuarine sediments using laboratory mesocosms. C. filigera is a dominant component of assemblages in the most severely contaminated sediments within the Derwent estuary, southern Australia. In the presence of C. filigera sediment O2 consumption doubled, with approximately 55% of this increase due to their respiration and the remaining 45% attributable to oxidation reactions and increased microbial respiration associated with burrow walls. Combined NO3 and NO2 fluxes were unaffected. The addition of labile organic matter did not affect benthic fluxes, in the presence or absence of C. filigera, presumably due to the short timeframe of the experiment and naturally enriched test sediments. The results suggest that a combination of tolerance and burrowing activity enables this species to provide an ecosystem service in the removal of N from contaminated sites.
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Affiliation(s)
- Joanne L Banks
- Department of Zoology, University of Melbourne, Victoria 3010, Australia.
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