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de Carvalho Vicente M, Trevisan CL, de Carvalho ACB, de Oliveira BCV, de Rezende CE, Machado WV, Wasserman JC. Geochemical fractionation of trace metals and ecological risk assessment of surface sediments in Sepetiba Bay, Brazil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:14254-14269. [PMID: 38273087 DOI: 10.1007/s11356-024-32095-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/16/2024] [Indexed: 01/27/2024]
Abstract
The Sepetiba Bay (Southeast Brazil) is a known Cd- and Zn-contaminated site that received spills of a large slag pile leachate from a Zn smelter. With important harbors, Sepetiba Bay demands periodic dredging operations which affect the mobility of the metals. The main goal of this work was to assess metal mobility in sediments and its associated toxicity in a fictive dredging area, to evaluate the risks of the operation. To achieve this goal, 18 superficial sediment samples were collected and characterized for pH and Eh. Sediments were analyzed for grain size, organic carbon, and total nitrogen, and metal mobility was evaluated with a sequential extraction procedure, proposed by the European Community Bureau of Reference (BCR). The results demonstrate that Cd and Zn are mainly associated with the exchangeable fraction (mean concentrations 1.4 mg kg-1 and 149.4 mg kg-1, respectively) and reducible fractions (mean concentrations 0.3 mg kg-1 and 65.5 mg kg-1, respectively), while Fe, Cr, Cu, Ni, and Al were associated with the residual fraction. Metals in the residual fraction are probably associated with the mineral lattice of the sediment and should not represent an environmental risk for the biota. The application of the enrichment factor and three risk assessment indexes (Risk Assessment Code, Risky Pollution Index, and Bioavailability Risk Assessment Index) show that the sediments are considerably enriched in metals that constitute a relevant risk for the sediment biota. In the case of dredging operations, Cd and Zn should be released to the overlying waters and be available to organisms, threatening the whole ecosystem. The proposed approach was shown to be much more precise than what is frequently presented in the Environmental Impact Assessments that only consider the threshold limits of the legislation.
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Affiliation(s)
- Murilo de Carvalho Vicente
- Programa de Pós-Graduação em Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói, RJ, 24020-141, Brazil
| | - Cleuza Leatriz Trevisan
- Programa de Pós-Graduação em Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói, RJ, 24020-141, Brazil
| | - Angelo Cezar Borges de Carvalho
- Programa de Pós-Graduação em Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói, RJ, 24020-141, Brazil
- Departamento de Ciências Ambientais, Universidade Federal de São Paulo, Rua São Nicolau 210, Diadema, SP, 09913030, Brazil
| | - Braulio Cherene Vaz de Oliveira
- Laboratório de Ciências Ambientais - LCA, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000 - Parque Califórnia, Campos dos Goytacazes, RJ, CEP 28013-602, Brazil
| | - Carlos Eduardo de Rezende
- Laboratório de Ciências Ambientais - LCA, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000 - Parque Califórnia, Campos dos Goytacazes, RJ, CEP 28013-602, Brazil
| | - Wilson Valle Machado
- Programa de Pós-Graduação em Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói, RJ, 24020-141, Brazil
| | - Julio Cesar Wasserman
- Programa de Pós-Graduação em Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói, RJ, 24020-141, Brazil.
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Liu Q, Jia Z, Liu G, Li S, Hu J. Assessment of heavy metals remobilization and release risks at the sediment-water interface in estuarine environment. MARINE POLLUTION BULLETIN 2023; 187:114517. [PMID: 36580839 DOI: 10.1016/j.marpolbul.2022.114517] [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: 10/23/2022] [Revised: 12/15/2022] [Accepted: 12/18/2022] [Indexed: 06/17/2023]
Abstract
The influence of overlying hydrodynamics on the exchange behaviour and fluxes of heavy metals at the sediment-water interface (SWI) is poorly understood. In the study, metals exchange behaviour and exchange rate at the SWI under resuspended and undisturbed scenario were investigated The results showed that dissolved Cr, Cu, Zn, and Pb concentrations increased rapidly to attain maximum values between 0.3 and 0.5 N·m-2 after the sediment resuspended. Following the quick release, metals concentrations gradually decreased and remained at relatively low levels, especially for Cu and Zn. Meanwhile, Cu, Zn, and Pb had higher potential remobilization potential in the undisturbed case. Calculating with the hydrodynamics in the Modaomen, the metals efflux under the resuspension scenario could reach 0.55 to 4130.83 mg·m-2·yr-1, which were 1-3 orders of magnitudes higher than the undisturbed case. Whether or not resuspension events occurred, estuarine sediments were source of heavy metals, especially in the weakly mixed zone.
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Affiliation(s)
- 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
| | - Zhenzhen Jia
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | - Guangzhou Liu
- Hubei Provincial Academy of Eco-environmental Science (Provincial Ecological Environment Engineering Assessment Center), Wuhan 430072, 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
| | - 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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Shi P, Yang J, Sun D, Wang C. A simulation from offsite disturbance experiments on the metal resuspension process in the seafloor of the Western Pacific. CHEMOSPHERE 2023; 311:137042. [PMID: 36419264 DOI: 10.1016/j.chemosphere.2022.137042] [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: 08/13/2022] [Revised: 10/23/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Deep-sea mining technology has developed rapidly in recent years. As an environmental concern of deep-sea mining, the impacts of sediment resuspension are not fully understood. To predict the threats to the deep-sea environment, the resuspension process of metals from solids to the dissolved phase was explored by conducting off-site artificial disturbance experiments in a nitrogen glove box. A magnetic stirring operation at 800 rpm for 20 min was set to simulate the resuspension process. Surface sediments from two multicore sampling stations (MC01 and MC08) were treated by two sediment-water ratios (1:3 and 1:10) simulating different disturbance intensities. The concentrations of dissolved metals in the overlying water before and after the perturbation experiment were analyzed after two filtration extraction methods (0.22 μm and 3 kDa). According to the observed behaviors, three groups of metals were distinguished: (1) metals whose concentrations were elevated after the disturbance, such as V, Rb, Mo, and Cd; (2) metals whose concentrations were depressed after the disturbance, such as Zn, Ga, Co, Cu, and Pb; and (3) metals whose behaviors were inconsistent between the stations, such as Li, Mn, Ni, and Cs. The disturbance-induced resuspension of metals was highly influenced by sediment compositions, such as the morphological states of metals in sediments and clay mineral composition. Instead, the particle concentration effect was less significant. Moreover, there was no evidence that colloids in the overlying water played a significant role in the remobilization of metals during the experiments. Considering the elevation of concentrations of V, Rb, Mo, and Cd in the overlying water after disturbance, the long-term impacts of these metals on the seafloor environments of the Western Pacific should be further explored in combination with temperature and pressure effects, as well as the tolerance of organisms to these metals.
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Affiliation(s)
- Pengtao Shi
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Juan Yang
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China.
| | - Dong Sun
- Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310000, China
| | - Chunsheng Wang
- Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310000, China
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Wang W, Lin C, Wang L, Liu Y, Sun X, Chen J, Lin H. Potentially hazardous metals in the sediment of a subtropical bay in South China: Spatial variability, contamination assessment and source apportionment. MARINE POLLUTION BULLETIN 2022; 184:114185. [PMID: 36194963 DOI: 10.1016/j.marpolbul.2022.114185] [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: 07/25/2022] [Revised: 09/21/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
Potentially hazardous metals (PHMs) in the coastal environment have become a great concern due to their easy bioaccumulation, poor biodegradability and high toxicity. Surface sediment samples were collected in a subtropical bay in South China to analyse the spatial variations, contamination level and potential sources of PHMs. The results indicated that the order of average contents of PHMs in Qinzhou Bay sediment was Zn > Pb > Cr > Cu > As > Hg > Cd. The most important potential ecological risk factor was Hg pollution in the Qinzhou Bay sediments. The positive matrix factorization (PMF) model results indicated that Cu, Pb, Zn, Cd and Cr mainly originated from natural sources while Hg and As were related to coal fired industrial inputs and petroleum production activities. The results could provide a basis for marine management to formulate relevant pollution prevention and control measures.
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Affiliation(s)
- Weili Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Cai Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China.
| | - Lingqing Wang
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
| | - Yang Liu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Xiuwu Sun
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Jinmin Chen
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Hui Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
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Wang W, Jiang R, Lin C, Wang L, Liu Y, Lin H. Multivariate statistical analysis of potentially toxic elements in the sediments of Quanzhou Bay, China: Spatial relationships, ecological toxicity and sources identification. ENVIRONMENTAL RESEARCH 2022; 213:113750. [PMID: 35753378 DOI: 10.1016/j.envres.2022.113750] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/17/2022] [Accepted: 06/19/2022] [Indexed: 06/15/2023]
Abstract
In this paper, the spatial distribution, pollution degree, ecological toxicity and possible sources of seven potentially toxic elements (PTEs) collected from the surface sediments of Quanzhou Bay (QZB) were analyzed by obtaining concentration measurements. The results indicated that the areas with high Cu, Pb, Zn and Hg concentrations were mainly located in the Luoyang River estuary, while the areas with high contents of Cd and As appeared in the Luoyang River estuary area and in the southern part of QZB, respectively. The contamination indices showed that the Cd pollution degree was slight to serious, while other elements were slightly enriched. The calculation results of the potential ecological risk index (RI) and toxic risk index (TRI) indicated that Cd was the main element posing ecological risk among the PTEs of sediments in QZB, followed by Hg. Moreover, in approximately 30% of the surveyed sites, PTEs exhibited low toxicity to aquatic ecosystems. Finally, the self-organizing map (SOM) and positive matrix factorization (PMF) model were used to determine the PTEs sources. Natural sources, industrial emissions, and the combustion of fossil fuels were three main sources for PTEs in the surface sediments of QZB. This study provides a reference for assessing sediment pollution and managing marine pollution in QZB.
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Affiliation(s)
- Weili Wang
- Key Laboratory of Global Change and Marine Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| | - Ronggen Jiang
- Key Laboratory of Global Change and Marine Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| | - Cai Lin
- Key Laboratory of Global Change and Marine Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China.
| | - Lingqing Wang
- Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Yang Liu
- Key Laboratory of Global Change and Marine Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
| | - Hui Lin
- Key Laboratory of Global Change and Marine Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
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Laboratory-Controlled Experiments Reveal Microbial Community Shifts during Sediment Resuspension Events. Genes (Basel) 2022; 13:genes13081416. [PMID: 36011326 PMCID: PMC9407494 DOI: 10.3390/genes13081416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 08/04/2022] [Accepted: 08/06/2022] [Indexed: 11/17/2022] Open
Abstract
In freshwater ecosystems, dynamic hydraulic events (floods or dam maintenance) lead to sediment resuspension and mixing with waters of different composition. Microbial communities living in the sediments play a major role in these leaching events, contributing to organic matter degradation and the release of trace elements. However, the dynamics of community diversity are seldom studied in the context of ecological studies. Therefore, we carried out laboratory-induced leaching experiments, using sediments from the Villerest dam reservoir (Villerest, France). To assess whole microbial community diversity, we sequenced the archaeal and bacterial 16S rRNA genes using Illumina MiSeq. Our results suggest that the degree of dissolved oxygen found in the water during these resuspension episodes influenced community dynamics, with anoxic waters leading to drastic shifts in sedimentary communities compared to oxic waters. Furthermore, the release of microbial cells from sediments to the water column were more favorable to water colonization when events were caused by oxic waters. Most of the bacteria found in the sediments were chemoorganotrophs and most of the archaea were methanogens. Methylotrophic, as well as archaeal, and bacterial chemoorganotrophs were detected in the leachate samples. These results also show that organic matter degradation occurred, likely participating in carbonate dissolution and the release of trace elements during freshwater resuspension events.
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Liu H, Ding F, Liu Y, Zhang L, Wu D. Solid-liquid partitioning and variation of palladium in rainfall runoff. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2022; 44:2407-2417. [PMID: 34228207 DOI: 10.1007/s10653-021-01032-8] [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: 04/01/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Palladium (Pd) is most widely used in the production of automotive catalytic converters that serve to reduce toxic emissions from motor vehicles. The aim of this study was to analyze the solid-liquid partitioning and dynamic variation of Pd in rainfall runoff. The results showed that the partition coefficients (K) of Pd ranged from 0.05 to 8.55. Transport via suspended particulate matter as the main carrier was the main form of Pd migration in rainfall runoff. Pd phase distribution exhibited complex dynamic variations. The variation in Pd could be roughly divided into three categories, namely the W, M and N types, and the semi-U type was also observed. Rainfall characteristics and microenvironmental factors had a profound effect on Pd phase distribution in the first flush runoff. Under the influence of multifactor coupling, the impact of water quality parameters such as pH, Eh and Cl- on Pd partitioning was significantly weakened.
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Affiliation(s)
- Haofeng Liu
- College of Geography and Environmental Science, Hainan Normal University, Haikou, 571158, Hainan, China
- Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands, Haikou, Hainan Province, China
| | - Fangfang Ding
- College of Geography and Environmental Science, Hainan Normal University, Haikou, 571158, Hainan, China
- Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands, Haikou, Hainan Province, China
| | - Yuyan Liu
- College of Geography and Environmental Science, Hainan Normal University, Haikou, 571158, Hainan, China.
- Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands, Haikou, Hainan Province, China.
| | - Lan Zhang
- Analysis and Testing Center, Capital Normal University, Beijing, 100048, China
| | - Dan Wu
- College of Geography and Environmental Science, Hainan Normal University, Haikou, 571158, Hainan, China
- Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands, Haikou, Hainan Province, China
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Bioavailability of Colloidal Iron to Heterotrophic Bacteria in Sediments, and Effects on the Mobility of Colloid-Associated Metal(loid)s. MINERALS 2022. [DOI: 10.3390/min12070812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The submicrometric fraction of surface sediments that accumulate in the bottom of dam reservoirs represent important sources of nutrients and contaminants in freshwater systems. However, assessing their stability in the presence of sediment bacteria as well as their bioavailability in the sediment remains poorly understood. We hypothesized that sediment’s bacteria are able to extract nutrients from sedimentary colloids (<1 µm fraction) and thus contribute to the release of other colloid-associated elements to water. Experiments were performed under laboratory conditions, using the submicrometric fractions of sediments recovered from two dam reservoirs (in calcareous and crystalline granitic contexts) and two heterotrophic bacteria (Gram-negative Pseudomonas sp. and Gram-positive Mycolicibacterium sp.). The results demonstrated that bacteria were able to maintain their metabolic activity (the acidification of the growth medium and the production of organic ligands) in the presence of colloids as the sole source of iron (Fe) and regardless of their chemical composition. This demonstrates that bioavailable Fe, aside from ionic forms, can also occur in colloidal forms. However, the bacteria also catalyzed the release of potentially toxic metallic elements (such as Pb) associated with colloids. These results help improve our understanding of the processes that influence contaminants’ mobility in the ecosystems as well as provide an important insight into current research evaluating the bioavailability of different forms of nutrients.
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Vicente M, Trevisan C, Carvalho A, Machado W, Wasserman J. A method to reproduce pH and Eh environmental changes due to sediment resuspension. MethodsX 2022; 9:101751. [PMID: 35756348 PMCID: PMC9213764 DOI: 10.1016/j.mex.2022.101751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/01/2022] [Indexed: 11/26/2022] Open
Abstract
During the last decades, metals have been released into coastal areas increasing the environmental and human health risks, however, resuspension events of trace metals polluted sediment could represent even more severe risks. Anoxic condition in the sediment is capable to stabilize the trace metals, due to the bonding with reduced anions. Although, the sediment resuspension can alter the potential redox and pH characteristics resulting in metals released from the water column. The climate change advance would impact directly on ocean chemistry, is expected the spatial increase of anoxic sites, mainly in coastal areas. Furthermore, it is mandatory and urgent to expand the knowledge over the process of sediment metals releasing in order to develop prediction and remediation tools for possible environmental impacts. This is a simple method of manipulating and simulating physicochemical alterations. The creation of microcosmos without oxygen allows the formation of a very reducible environment, common in coastal areas with low energy and high organic matter input. And further oxidation allows the assessment of the trace metals released to the water column and/or the new arrangement of these metals in different geochemical fractions. • The experimental procedure to assess trace metals mobility to potential redox and pH changes in sediment and water. • A method is suitable for a wild range of sediment characteristics.
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Zhao Q, Ding S, Geng Z, Lu X, Hong Z, Liu Y, Yu J. Concentration, Health Risk, and Hydrological Forcing of Heavy Metals in Surface Water Following Water-Sediment Regulation of the Xiaolangdi Dam in the Yellow River. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19095713. [PMID: 35565108 PMCID: PMC9099827 DOI: 10.3390/ijerph19095713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/02/2022] [Accepted: 05/05/2022] [Indexed: 02/05/2023]
Abstract
Water and sediment regulation aimed at aquatic ecosystems and preserving reservoir capacity to minimize the negative consequences of dams can fundamentally change the distribution of heavy metals (HMs) in the reservoir and downstream reaches. However, the effects of water and sediment regulation on variation in HMs are still poorly understood. In this study, the variations in concentration, contamination, human health risk, potential sources, and influencing factors of the metalloid As and HMs (Cr, Hg, Ni, Pb, and Zn) in surface water in the reservoir and the downstream reach of the Xiaolangdi Dam (XLD) following the operation of the water-sediment regulation scheme (WSRS) were determined. These results indicate that HM concentrations in the two post-WSRS seasons were much lower than the water quality standards, but were significantly increased over time due to the trapping effects of the XLD (p < 0.05, except for Zn). However, As concentration in the reservoir was significantly lower than that observed in downstream reaches, likely due to anthropogenic input from agricultural activities. Meanwhile, HM concentrations varied with distance to the dam, which displayed a distinct accumulation closer to the dam in the post-WSRS II season. The contamination of HMs, the carcinogenic risk of exposure to As, and the noncarcinogenic risks associated with exposure to Hg, Ni, Pb, and Zn via the direct ingestion pathway of drinking water were all within acceptable levels following the WSRS, but increased over time. The carcinogenic risk of Cr in the post-WSRS II season was at an unacceptably high level, particularly at sites near the dam. Hydrological characteristics (water level and flow rate) were the dominant factors in determining the distribution of HMs. These results can provide new insight for a better understanding of the variations in HMs following the water and sediment regulation practices, and guide future management in regulating the trapping effects of dams.
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Occurrence and Ecological Risk Assessment of Heavy Metals from Wuliangsuhai Lake, Yellow River Basin, China. WATER 2022. [DOI: 10.3390/w14081264] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
As one of the eight largest freshwater lakes in China, Wuliangsuhai Lake is an extremely rare large lake with biodiversity and environmental protection functions in one of the world’s arid or semi-arid areas and it plays a pivotal role in protecting the ecological security of the Yellow River Basin. Heavy metals in sediment interstitial water, surface sediments, and sediment cores of Wuliangsuhai Lake were investigated and analyzed, and the pollution degree evaluated based on multiple assessment methods. The bioavailability of heavy metals of the surface sediments was evaluated by calculating the ratio of chemical fractions of heavy metals. The toxicity assessment of sediment interstitial water indicated that Ni, Zn, As, and Cd would not be toxic to aquatic ecosystems, however, Hg and Cr in some regions may cause acute toxicity to the benthos. The ecological assessment results of the surface sediments indicated that some areas of the lake are heavily polluted and the main polluting elements are Cd and Hg. Cd has the highest bioavailability because of its high exchangeable fraction ratio. In addition, exogenous pollution accumulated within 20 cm of the sediment cores, and then, with the increasing of the depth, the pollution degree and ecological risk decreased.
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Zhao Q, Ding S, Hong Z, Ji X, Wang S, Lu M, Jing Y. Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 227:112943. [PMID: 34710818 DOI: 10.1016/j.ecoenv.2021.112943] [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: 08/23/2021] [Revised: 10/18/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
The water-sediment regulation scheme (WSRS) of dams influences the desorption, resuspension, and deposition processes of riparian sediments, which in turn affect the spatial-temporal variations of heavy metals (HMs) in riparian sediments and leads to severe degradation of soil and water quality. However, the difference between the trapping effect of dams and the redistribution effects of the WSRS on HMs in riparian sediments, as well as the consecutively seasonal change of HMs after the WSRS, are rarely reported. To fill this gap, the concentrations of six HMs including Cd, Cr, Cu, Ni, Pb, and Zn in riparian sediments along the Xiaolangdi Dam (XLD) Reservoir and its downstream reach were investigated, and the contamination level and potential ecological risk of HMs were assessed, to differentiate the effects of the XLD and its WSRS on the concentration, contamination level, and potential ecological risks of HMs. The results indicated that the mean HM concentrations in riparian sediments were higher than the background values in the study area and showed significant spatial and temporal variations. However, the regional differences of HM concentrations caused by the trapping effect of the XLD were less than the seasonal differences caused by the redistribution effects of the WSRS. The contamination and ecological risk assessment indicated that riparian sediments in the study area were contaminated by the six HMs, particularly by Cd and Pb, which overall exhibited a high and moderate ecological risk, respectively. The sources for Pb were likely agricultural inputs, while the sources for Cd should be attributed to both industrial and agricultural inputs. Overall, the trapping effect of the XLD led to the accumulation of HMs in riparian sediments along the reservoir area, while the regulation effects of the WSRS resulted in the redistribution of HMs in riparian sediments from the reservoir area to the downstream reach.
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Affiliation(s)
- Qinghe Zhao
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
| | - Shengyan Ding
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China.
| | - Zhendong Hong
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
| | - Xiaoyu Ji
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
| | - Shuoqian Wang
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
| | - Mengwen Lu
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
| | - Yaru Jing
- Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions of the Ministry of Education, College of Geography and Environmental Science, Henan University, Kaifeng, P.R. China
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Liu Q, Sheng Y, Liu X. Efficacy of in situ active capping Cd highly contaminated sediments with nano-Fe 2O 3 modified biochar. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 290:118134. [PMID: 34523520 DOI: 10.1016/j.envpol.2021.118134] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 09/02/2021] [Accepted: 09/06/2021] [Indexed: 05/09/2023]
Abstract
Effective remediation of Cd polluted sediment is imperative for its potential damages to aquatic ecosystem. Biochar (BC) and nano-Fe2O3 modified BC (nFe2O3@BC) were conducted to remedy Cd highly contaminated sediments, and their performances, applicable conditions, and mechanisms were investigated. After 60 d capping, both BC and nFe2O3@BC capping inhibited Cd release from sediment to overlying water and porewater (reduction rates >99%). The released Cd concentrations in overlying water with nFe2O3@BC capping decreased by 1.6-11.0 times compared to those of BC capping, indicating nFe2O3@BC presented a higher capping efficiency. Notably, the increases of acidity and disturbance intensity of overlying water weakened the capping efficiencies of nFe2O3@BC and BC. BC capping was inappropriate in acidic and neutral waters (pH 3, 5, and 7) because Cd maintained a continuous release after 15 d, while nFe2O3@BC capping was valid in all pH treatments. Under 150 rpm stirring treatment, Cd release rates with BC and nFe2O3@BC capping decreased after 15 d and 30 d, respectively. At 0 and 100 rpm treatments, Cd releases treated by nFe2O3@BC capping finally kept a balance, indicating nFe2O3@BC was valid at low disturbance intensity. BC and nFe2O3@BC capping inhibited Cd release via weakening the influences of pH and disturbance on sediment. However, capping layers should be further processed because most adsorbed Cd in capping layers (>98%) would be re-released into overlying water. Meanwhile, excessive application of nFe2O3@BC could increase the risk of Fe release. The results provide novel insights into the potential applications of nFe2O3@BC and BC in situ capping of Cd polluted sediments in field remediation.
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Affiliation(s)
- Qunqun Liu
- Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yanqing Sheng
- Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
| | - Xiaozhu Liu
- Research Center for Coastal Environment Engineering Technology of Shandong Province, 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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Dou M, Liang L, Han Y, Jia R, Zhang Y. Eutrophication model driven by light and nutrients condition change in sluice-controlled river reaches. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:61647-61664. [PMID: 34189696 DOI: 10.1007/s11356-021-15002-1] [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: 11/19/2020] [Accepted: 06/15/2021] [Indexed: 06/13/2023]
Abstract
River eutrophication has become a challenging environmental problem worldwide because of the strong interference of anthropogenic activities and hydraulic structures. The driving mechanism of algae growth in sluice-controlled river reaches (SCRRs) is more complicated than that of natural rivers, because the operation mode of the sluices is an important influencing factor which changes the light and nutrient conditions of the water body. The main purpose of this study was to assess algal growth in SCRRs under external conditions and sluice regulation. In this study, a eutrophication model for SCRRs was developed based on the mechanism of river hydrodynamics and algae growth kinetics, considering the variation in underwater light intensity and nutrient condition. By choosing the light intensity, phosphorus concentration and sluice gate opening size as the influencing factors, 16 different combination conditions were proposed by orthogonal experimental design, and eutrophication of water bodies in the SCRRs was simulated using a eutrophication model. In the scenario design, four gate opening sizes were set, and the light intensity and nutrients were enlarged or reduced based on the original monitoring data. The results showed that both light intensity and nutrient concentration can promote the algal growth within a suitable range, and increasing the gate opening size can inhibit algal growth.
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Affiliation(s)
- Ming Dou
- School of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
- School of Ecology and Environment, Zhengzhou University, No. 100 Kexue Road, Zhengzhou, 450001, Henan, China.
| | - Li Liang
- School of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yuping Han
- The Yellow River Institute of Science, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China
| | - Ruipeng Jia
- School of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yan Zhang
- School of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
- Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang, 453000, China
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15
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Li N, Huang T, Li Y, Si F, Zhang H, Wen G. Inducing an extended naturally complete mixing period in a stratified reservoir via artificial destratification. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 745:140958. [PMID: 32738682 DOI: 10.1016/j.scitotenv.2020.140958] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 07/11/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Naturally complete mixing (i.e., ΔT <1 °C across the entire water column) driven by convection in winter is an ideal state for maintaining good water quality, as it spontaneously redistributes dissolved oxygen (DO) over the entire water column and prevents hypolimnetic anoxia and associated pollution. A complete mixing duration is quite short under natural mixing conditions, whereas artificial destratification systems can artificially induce an earlier occurrence of complete mixing, thereby prolonging the span of the naturally complete mixing period by several months. Based on multi-year in situ water quality measurements and meteorological data during natural and artificial mixing periods, this study evaluates the effects of water-lifting aerators (WLAs) and climatic factors on convective mixing processes and their duration. WLA-supplied turbulent kinetic energy (TKE) and WLA-induced hypolimnion warming significantly decrease the water stability and extend the naturally complete mixing period for 2.6-fold. The results indicate that an optimal WLA implementation should immediately achieve complete mixing when surface mixing occurs in autumn. By evaluating the influence of WLAs and other factors on convective mixing, this study provides insights for successful destratification system operations (i.e., WLAs) to replenish oxygen concentrations across the water column and minimize operating costs by taking advantage of climatic conditions. Although our study focuses on WLA-induced mixing, these observations can be applicable to other destratification systems in most of the stratified reservoirs and lakes.
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Affiliation(s)
- Nan Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tinglin Huang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Yang Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; School of Energy and Environment, Zhongyuan University of Technology, ZhengZhou 450007, China
| | - Fan Si
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Haihan Zhang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Gang Wen
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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16
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Drygiannaki I, Rao B, Dawson JA, Rakowska M, Reible DD, Hayman NT, Rosen GH, Colvin MA, Chadwick DB, Pitt R, Otto M, Steets B, Ervin J. Assessing sediment recontamination from metals in stormwater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 737:139726. [PMID: 32563112 DOI: 10.1016/j.scitotenv.2020.139726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 05/24/2020] [Accepted: 05/24/2020] [Indexed: 06/11/2023]
Abstract
Recontamination of sediments by stormwater is a major concern when evaluating the potential effectiveness of sediment remediation. Stormwater and sediment sampling were conducted in a mixed-use watershed at Paleta Creek in San Diego, CA to evaluate methods for assessing sediment recontamination by metals. Size-segregated stormwater contaminant loads with simultaneous receiving water and sediment measurements were used to identify dominant sources and contaminants with respect to their impact on sediment recontamination. Most of the stormwater contaminant loads of Cd, Cu, Pb, and Zn were associated with residential and highway sources from the upstream portions of the watershed and As, Ni and Hg were more significantly influenced by the downstream area of the watershed. Cd was strongly associated with large particles (>63 μm) and observed to settle in near shore areas with some attenuation due to mixing and dilution. Cu, in contrast, was associated more with the filtered fraction (<0.45 μm) and clay fraction (0.45-5 μm), resulting in less near shore sediment recontamination. Depositing sediment and other metals, particularly Cu and Hg, exhibited greater accumulation in settling traps than could be attributed to stormwater loads indicating the importance of other sources or resuspension of bay sediments on surficial sediment concentrations. Pb, Zn, Ni, and As showed influences of both stormwater and other sources. The study showed that measurement of size-segregated stormwater contaminant mass and concentrations combined with simultaneous measurements of deposition in sediment traps could differentiate between recontamination by stormwater and that of other sources.
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Affiliation(s)
| | - Balaji Rao
- Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA
| | - John A Dawson
- Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA
| | | | - Danny D Reible
- Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA.
| | - Nicholas T Hayman
- Naval Warfare Information Center Pacific, 53560 Hull St, San Diego, CA 92152-5001, USA
| | - Gunther H Rosen
- Naval Warfare Information Center Pacific, 53560 Hull St, San Diego, CA 92152-5001, USA
| | - Marienne A Colvin
- Naval Warfare Information Center Pacific, 53560 Hull St, San Diego, CA 92152-5001, USA
| | - D Bart Chadwick
- Naval Warfare Information Center Pacific, 53560 Hull St, San Diego, CA 92152-5001, USA
| | - Robert Pitt
- University of Alabama, Tuscaloosa, AL 35487, USA (Ret.)
| | - Megan Otto
- Geosyntec Consultants, 924 Anacapa St #4a, Santa Barbara, CA 93101, USA
| | - Brandon Steets
- Geosyntec Consultants, 924 Anacapa St #4a, Santa Barbara, CA 93101, USA
| | - Jared Ervin
- Geosyntec Consultants, 924 Anacapa St #4a, Santa Barbara, CA 93101, USA
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Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic. ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION 2020. [DOI: 10.3390/ijgi9040258] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A wide variety of geographic information system tools and methods was used for pre-dam topography reconstruction and reservoir bottom surveying in two dam reservoirs in the Ohře River, Czech Republic. The pre-dam topography was reconstructed based on archival aerial imagery and old maps. The benefits and drawbacks of these methods were tested and explained with emphasis on the fact that not all processed archival data are suitable for pre-dam topography modeling. Bathymetric surveying of a reservoir bottom is presently routine, but in this study, we used a wide combination of bathymetric mapping methods (sonar, ground penetration radar, and sub-bottom profiler) and topographic survey tools (LiDAR and photogrammetry), bringing great benefits for bottom dynamic analysis and data cross-validation. The data that we gathered made it possible to evaluate the formation of the inflow deltas in the reservoirs studied and assess the sediment reworking during recent seasonal drawdowns. A typical inflow delta was formed in the deeper of the two studied reservoirs, while the summer 2019 drawdown caused the formation and incision of a temporary drawdown channel and erosive downstream transport of approximately 1/10 of the delta body thickness in approximately 1/10 of the delta transverse size. No inflow delta was formed in the shallower of the studied reservoirs, but unexpectedly extensive sediment reworking was observed in the inflow part of the reservoir. Both the studied reservoirs and the pre-dam river floodplain have accumulated historical contamination by risk elements such as As, Hg, Pb; thus, the enhanced erosion of existing sediment bodies expected in the future, owing to more frequent droughts and global climate change, will endanger the ecological quality of the water and solids outflowing from the reservoirs.
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18
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Lécrivain N, Duparc A, Clément B, Naffrechoux E, Frossard V. Tracking sources and transfer of contamination according to pollutants variety at the sediment-biota interface using a clam as bioindicator in peri-alpine lakes. CHEMOSPHERE 2020; 238:124569. [PMID: 31442777 DOI: 10.1016/j.chemosphere.2019.124569] [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: 05/10/2019] [Revised: 08/08/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Point pollution sources may differently impact lakes littoral, possibly leading to local ecological risks. The concomitant chemical analysis of littoral-benthic organisms and sediment can provide insights into the bioavailability and thus the ecological risk of contaminants. In this study, the autochthonous Corbicula fluminea was used to assess the sources and transfer of six trace metals (TMs) and fourteen Polycyclic Aromatic Hydrocarbons (PAHs) to the littoral-benthic biota of a large lake. The contaminant concentrations spatially varied with a value scale from 1 to 280 000 times along the lake littoral in both the sediment and clams. Multiple linear regressions were performed to explain the spatial variability of Corbicula fluminea contamination by considering both watershed and in-lake sources. The concentration of the sum of PAHs in clams was significantly correlated with sediment contamination, suggesting that PAHs contamination of the benthic biota mainly occur from the sediment. Most of the internal TM concentrations of clams were significantly correlated with stormwater drainage areas in the lake watershed, highlighting the importance of stormwater runoffs in the littoral biota contamination. The transfer of TMs and PAHs was assessed through the bioconcentration factor defined as the ratio of internal and sediment concentrations. As, Cd, Cu, Zn and light molecular weight PAHs were more bioconcentrated in C. fluminea than Pb, Sn and heavy molecular weight PAHs, suggesting differences in their bioavailability. This study underlines the relevance of using autochthonous organisms as bioindicators of lake littoral biota contamination concomitantly with sediment matrices, and illustrates the challenge of tracking pollution sources in lakes.
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Affiliation(s)
- Nathalie Lécrivain
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69518, Vaulx-en-Velin, France.
| | - Antoine Duparc
- UMR 5553 LECA, Université Savoie Mont-Blanc, 73376, Le Bourget du Lac, France
| | - Bernard Clément
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69518, Vaulx-en-Velin, France
| | | | - Victor Frossard
- UMR 42 CARRTEL, Université Savoie Mont-Blanc, 73376, Le Bourget du Lac, France
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19
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Zhu X, Chatain V, Gautier M, Blanc-Biscarat D, Delolme C, Dumont N, Aubin JB, Lipeme Kouyi G. Combination of Lagrangian Discrete Phase Model and sediment physico-chemical characteristics for the prediction of the distribution of trace metal contamination in a stormwater detention basin. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 698:134263. [PMID: 31505363 DOI: 10.1016/j.scitotenv.2019.134263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 08/29/2019] [Accepted: 09/02/2019] [Indexed: 06/10/2023]
Abstract
Elevated trace metal concentrations in sediments pose a major problem for the management of stormwater detention basins. These basins provide a nature-based solution to remove particulate pollutants through settling, but the resuspension of these contaminated deposits may impact the quality of both surface and groundwater. A better understanding of trace metal distribution will help to improve basin design and sediment management. This study aims to predict the distribution of trace metal contamination in a stormwater detention basin through (i) investigation of the correlation between metal content in sediments and their settling velocity, and (ii) the coupling of such correlation with a Lagrangian Discrete Phase Model (LDPM). The correlation between Fe, Cr, Cu, Ni, Pb contents and the settling velocity is firstly investigated, based on the sediments collected from 6 sites (inlet and 5 traps at the bottom of a detention basin situated in Chassieu, France) during 5 campaigns in 2017. Results show that Fe is strongly correlated to settling velocity and can be considered as a good indicator of trace metal contents. The derived correlation is then combined with a LDPM for the prediction of trace metal distribution, producing results consistent with in situ measurements. The proposed methodology can be applied for other stormwater basins (dry or wet). As described in this article, the interactions between hydrodynamics and sediment physico-chemical characteristics is crucial for the design and management of stormwater detention basins, allowing managers to target the highest contaminated sediments.
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Affiliation(s)
- Xiaoxiao Zhu
- Univ Lyon, INSA Lyon, DEEP, F-69621 Villeurbanne Cedex, France.
| | - Vincent Chatain
- Univ Lyon, INSA Lyon, DEEP, F-69621 Villeurbanne Cedex, France
| | - Mathieu Gautier
- Univ Lyon, INSA Lyon, DEEP, F-69621 Villeurbanne Cedex, France
| | | | - Cécile Delolme
- Univ Lyon, INSA Lyon, DEEP, F-69621 Villeurbanne Cedex, France
| | - Nathalie Dumont
- Univ Lyon, INSA Lyon, DEEP, F-69621 Villeurbanne Cedex, France
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20
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Bao T, Wang P, Hu B, Shi Y. Investigation on the effects of sediment resuspension on the binding of colloidal organic matter to copper using fluorescence techniques. CHEMOSPHERE 2019; 236:124312. [PMID: 31545181 DOI: 10.1016/j.chemosphere.2019.07.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/03/2019] [Accepted: 07/05/2019] [Indexed: 06/10/2023]
Abstract
Colloidal organic matter (COM), an important component of dissolved organic matter (DOM), plays a significant role in the transport and cycling process of the heavy metals. In this study, COM was fractionated from DOM using 0.2 μm, 100 kDa, and 2 kDa ultrafiltration membranes and the fluorescence spectra of the COM fractions were obtained. Excitation and emission matrix-parallel factor analysis and two-dimensional fluorescence correlation spectroscopy were applied to investigate the effect of sediment resuspension on the heavy metal binding characteristics of COM fractions with different molecular weights. Compared with the DOM fractions, COM exhibited stronger binding affinities and more binding sites for Cu(II), which was attributed to the significant binding effects of the components of COM. Our results suggested that the protein-like components were mainly responsible for binding heavy metals in the high-molecular-weight fraction (>100 kDa), whereas the humic-like components were responsible in the low-molecular-weight fraction (<100 kDa). Furthermore, sediment resuspension significantly influenced the composition and heavy metal binding characteristics of COM. Following resuspension, the binding affinity of COM decreased significantly, which might be attributed to the binding competition from inorganic colloids. Thus, COM plays an important role in the binding and transportation behavior of heavy metals, which is an important consideration in shallow lake ecosystems.
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Affiliation(s)
- Tianli Bao
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China; College of Environment, Hohai University, Nanjing, 210098, People's Republic of China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China; College of Environment, Hohai University, Nanjing, 210098, People's Republic of China.
| | - Bin Hu
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China; College of Environment, Hohai University, Nanjing, 210098, People's Republic of China
| | - Yue Shi
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, People's Republic of China; College of Environment, Hohai University, Nanjing, 210098, People's Republic of China
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21
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Chassiot L, Francus P, De Coninck A, Lajeunesse P, Cloutier D, Labarre T. Spatial and temporal patterns of metallic pollution in Québec City, Canada: Sources and hazard assessment from reservoir sediment records. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 673:136-147. [PMID: 30986673 DOI: 10.1016/j.scitotenv.2019.04.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/31/2019] [Accepted: 04/01/2019] [Indexed: 06/09/2023]
Abstract
Québec City (QC, Canada) is an important urban center developed along the Saint-Charles River, at the confluence with the Saint-Lawrence River. Here, environmental issues related to pollution have been recently raised for sediments trapped upstream a dam built in the early 1970s. The major concern is about downstream transport of sediments and contaminants toward the Saint-Lawrence Estuary, a protected marine area of high socioeconomic value. This article deals with metallic contaminants in reservoir sediments collected along a longitudinal transect in the Saint-Charles River. The spatial and temporal patterns of metallic pollution have been assessed by the calculation of enrichment factors, geoaccumulation indexes, and metallic pollution index on 68 samples from a set of sediment cores and surface sediment samples. Severe to extreme pollutions are recorded with respect to silver (Ag), chromium (Cr), copper (Cu), mercury (Hg), and lead (Pb). Spatial analyses show contaminated samples are trapped in the downstream section of the river, where several point (industries, mall, harbor) and diffuse (dense urban habitat, road network) sources of pollution were evidenced using historical documents and multivariate statistics such as PCA/FA. A 50-yr sedimentary record indicates these metals were mainly delivered to the river system by the accumulation of fine-grained, organic-rich sediments during the 1970s and the 1980s. Since then, the commissioning of wastewater treatment plants in the city and environmental regulations likely played a key role to reduce the metallic yield in the Saint-Charles River. More recently, the river flow management within the reservoir favored the accumulation of much less contaminated sediments, burying the contamination. Yet, a significant environmental hazard remains if this sandy layer is removed by erosion, allowing for the remobilization and transport of contaminated sediments downstream toward the Saint-Lawrence River.
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Affiliation(s)
- Léo Chassiot
- INRS-ETE, 490 rue de la Couronne, Québec, QC G1R 9A9, Canada; GEOTOP, Geochemistry and Geodynamics Research Center, 201 Avenue du Président Kennedy, Montréal, QC H2X 3Y7, Canada; Département de Géographie, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada; Centre d'Études Nordiques, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada.
| | - Pierre Francus
- INRS-ETE, 490 rue de la Couronne, Québec, QC G1R 9A9, Canada; GEOTOP, Geochemistry and Geodynamics Research Center, 201 Avenue du Président Kennedy, Montréal, QC H2X 3Y7, Canada
| | | | - Patrick Lajeunesse
- Département de Géographie, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada; Centre d'Études Nordiques, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada
| | - Danielle Cloutier
- Département de Géographie, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada
| | - Thibault Labarre
- Département de Géographie, Université Laval, Pavillon Abitibi-Price, 2405 Rue de la Terrasse, Québec, QC G1V 0A6, Canada
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22
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Lécrivain N, Frossard V, Clément B. Changes in mobility of trace metals at the sediment-water-biota interfaces following laboratory drying and reimmersion of a lacustrine sediment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:14050-14058. [PMID: 30852750 DOI: 10.1007/s11356-019-04729-7] [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: 09/06/2018] [Accepted: 02/27/2019] [Indexed: 06/09/2023]
Abstract
Alterations in the timing, frequency, and magnitude of water level fluctuations (WLF) in lakes may result in important changes in abiotic parameters that can affect sediment-borne contaminant mobility at the sediment-water-biota interfaces in littoral zones. This study aims to assess the mobility of trace metals (TMs)-Cd, Cr, Cu, Ni, Pb, and Zn-under laboratory-simulated WLF (i.e., drying and reimmersion of sediments) through a three-pronged approach. One surficial sediment was sampled from the shoreline of a large French lake exhibiting an artificially limited WLF. A sample was enriched with a solution of TMs to ensure significant measurements of mobility. The spiked and naturally contaminated sediments were dried and reimmersed. The first approach consisted in measuring the mobility of TMs from the sediment to the water column under resuspensions of particles through leaching tests. The second approach assessed the partitioning of TMs between the different binding forms within the sediments through sequential extraction tests. The last approach tested the changes in TM bioconcentration in organisms exposed to sediment through microcosm assays. The hypothesis was that WLF may increase mobility from the sediment to the water column relative to mobility from the residual to easily mobilizable fractions within the sediments and consequently increase the bioconcentration of less inert trace metals, mostly Cd and Zn. This hypothesis was partly rejected as TM binding forms mainly increased toward the residual fractions within the sediment, especially for Cd and Zn, and bioconcentration mainly decreased following WLF. However, TM concentration increased in the water column when WLF included great resuspension of particles. The study also provides insights into the complex relationships among contaminant mobility to the water column, bioavailability, and bioconcentration, especially in the context of large abiotic disturbances such as WLF. These findings may be useful for further management strategies for WLF-regulated lakes and reservoirs.
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Affiliation(s)
- Nathalie Lécrivain
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69518, Vaulx-en-Velin, France.
| | - Victor Frossard
- Université Savoie Mont-Blanc, UMR 42 CARRTEL, 73376, Le Bourget du Lac, France
| | - Bernard Clément
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, F-69518, Vaulx-en-Velin, France
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23
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Bretier M, Dabrin A, Bessueille-Barbier F, Coquery M. The impact of dam flushing event on dissolved trace elements concentrations: Coupling integrative passive sampling and discrete monitoring. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 656:433-446. [PMID: 30522026 DOI: 10.1016/j.scitotenv.2018.11.303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 11/09/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
Sediments accumulation in reservoirs induces water storage capacities reduction and flood risks increases rendering dam flushing or dredging events compulsory for security reasons. Short transient events like dam flushing monitoring is still a great challenge because the suspended sediments and contaminants concentrations increases could occur over only few hours/days and cover tens of kilometres. Since 1942, 21 dam flushing events have been performed on the Upper Rhône River (from Lake Geneva in Switzerland to Lyon in France) in order to evacuate accumulated sediments behind the Verbois dam (Switzerland). We designed an original sampling strategy to assess the 2016 dam flushing event consequences on the spatio-temporal dynamics of dissolved trace elements concentration and to reveal how passive sampling monitoring (Diffusive Gradient in Thin films, DGT) could improve this evaluation. Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb, As and Hg dissolved concentrations were monitored by discrete and passive sampling at 3 stations over 160 km downstream the Verbois dam. Since dissolved Fe, Cu, Cd, Cr, Pb, Zn and Hg concentrations did not show great variations during the flushing event, the DGT efficiency was not fully demonstrated for these elements. In contrast, a sharp increase of Mn, Ni, Co and As dissolved concentrations (up to 22 times) was recorded, resulting mainly from a release from resuspended sediment. The dissolved As increase was mainly caused by reduced arsenic (AsIII) increase, even monitored 160 km downstream the Verbois dam. The DGT measurements were highly representative of trace elements concentrations and As speciation dynamics in comparison with discrete sampling. Although relatively high dispersion was highlighted for some elements DGT measurements during the flushing event, we showed that DGTs are robust and powerful time-integrative tools to monitor many trace elements more efficiently than discrete sampling during a short transient event on a large spatial scale.
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Affiliation(s)
- M Bretier
- Irstea, UR RiverLy, centre de Lyon-Villeurbanne, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France.
| | - A Dabrin
- Irstea, UR RiverLy, centre de Lyon-Villeurbanne, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France
| | - F Bessueille-Barbier
- Institut des Sciences Analytiques, Université de Lyon, CNRS, Université Claude Bernard Lyon 1, ENS Lyon, UMR5280, 5 rue de la Doua, F-69100 Villeurbanne, France
| | - M Coquery
- Irstea, UR RiverLy, centre de Lyon-Villeurbanne, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France
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Heavy Metals in Bottom Sediments of Reservoirs in the Lowland Area of Western Poland: Concentrations, Distribution, Sources and Ecological Risk. WATER 2018. [DOI: 10.3390/w11010056] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The paper presents the results of a study of heavy metals (HMs) concentrations in six retention reservoirs located in the lowland area of western Poland. The objectives of this study were to analyze the Cd, Cr, Cu, Ni, Pb and Zn concentrations, assess contamination and ecological risk, analyze the spatial variability of HM concentrations and identify potential sources and factors determining the concentration and spatial distribution. The bottom sediment pollution by HMs was assessed on the basis of the index of geo-accumulation (Igeo), enrichment factor (EF), pollution load index (PLI) and metal pollution index (MPI). To assess the ecological risk associated with multiple HMs, the mean probable effect concentration (PEC) quotient (Qm-PEC) and the toxic risk index (TRI) were used. In order to determine the similarities and differences between sampling sites in regard to the HM concentration, cluster analysis (CA) was applied. Principal component analysis (PCA) was performed to assess the impact of grain size, total organic matter (TOM) content and sampling site location on HM spatial distribution. Additionally, PCA was used to assess the impact of catchment, reservoir characteristics and hydrological conditions. The values of Igeo, EF, MPI and PLI show that Cd, Cr, Cu, Ni and Pb mainly originate from geogenic sources. In contrast, Zn concentrations come from point sources related to agriculture. The mean PEC quotient (Qm-PEC) and TRI value show that the greatest ecological risk occurred at the inlet to the reservoir and near the dam. The analysis showed that the HMs concentration depends on silt and sand content. However, the Pb, Cu, Cd and Zn concentrations are associated with TOM as well. The relationship between individual HMs and silt was stronger than with TOM. The PCA results indicate that HMs with the exception of Zn originate from geogenic sources—weathering of rock material. However, the Ni concentration may additionally depend on road traffic. The results show that a reservoir with more frequent water exchange has higher HMs concentrations, whereas the Zn concentration in bottom sediments is associated with agricultural point sources.
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Benabdelkader A, Taleb A, Probst JL, Belaidi N, Probst A. Anthropogenic contribution and influencing factors on metal features in fluvial sediments from a semi-arid Mediterranean river basin (Tafna River, Algeria): A multi-indices approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 626:899-914. [PMID: 29396350 DOI: 10.1016/j.scitotenv.2018.01.107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 01/11/2018] [Accepted: 01/12/2018] [Indexed: 06/07/2023]
Abstract
Metals in river sediments from a semi-arid Mediterranean basin were investigated from upstream to downstream during contrasting hydrological conditions in 2014 and 2015. The level and origin of the contamination were evaluated using several geochemical and isotopic indicators. Elements were grouped by their level of contamination: high (Pb > Cd > Zn > Cu) and low (Al, Fe, Cr, Co, Ni). Multiple local sources of contamination were identified (industrial, agricultural and domestic waste), as well as very specific ones (gasoline station) and diffuse pollution from atmospheric deposition (gasoline, ores, aerosols). During storm events, the upstream dams can either be secondary sources of contamination or dilutors through particles derived from natural erosion. The contamination was slowed downstream due to the river geomorphology, but eventually washed into the Mediterranean Sea by intense storm events. Naturally derived elements (Co, Ni, Cr, As) were associated with Al, Fe and Mn oxides or clays, and anthropogenic originated metals with phosphorus (Cd and Zn), sulphur (Cu) and POC (Pb enrichment). Cadmium and Pb were the most available metals upstream and at the outlet, but their availability was not strictly related to their degree of contamination. These conclusions could be drawn thanks to an approach by multiple indicators.
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Affiliation(s)
- A Benabdelkader
- EcoLab, Université de Toulouse, CNRS, Toulouse, France; LEcGEN, Université Abou Bekr Belkaid de Tlemcen, Tlemcen, Algeria
| | - A Taleb
- LEcGEN, Université Abou Bekr Belkaid de Tlemcen, Tlemcen, Algeria
| | - J L Probst
- EcoLab, Université de Toulouse, CNRS, Toulouse, France
| | - N Belaidi
- LEcGEN, Université Abou Bekr Belkaid de Tlemcen, Tlemcen, Algeria
| | - A Probst
- EcoLab, Université de Toulouse, CNRS, Toulouse, France.
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Dou M, Cao Y, Mi Q, Li G, Wang Y. Multi-phase transformation model of water quality in the sluice-controlled river reaches of Shayinghe River in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:6633-6647. [PMID: 29260470 DOI: 10.1007/s11356-017-0991-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 12/10/2017] [Indexed: 06/07/2023]
Abstract
To better understand the complex transformation mechanisms of pollutants in different phases in sluice-controlled river reaches (SCRRs), a multi-phase transformation model of water quality is proposed. This model mainly describes the interactions of the water body, suspended matter, deposited sediments, and organisms. Mathematical expressions were first derived to describe the mass transportation processes in different phases of the river system. The multi-phase transformation model in SCRRs was then established with defined physical mechanisms. Monitored data from the operation of Huaidian sluice were used to identify and validate the parameters of the transformation model and to simulate the spatial and temporal changes of pollutants in different phases. Four findings were made from the results. Firstly, the concentration values of pollutants in each phase in the upper and lower river reaches of the sluice are affected by flow, mode of sluice operation, and algal growth and enrichment. Secondly, the reaction processes in the upper and lower river reaches of the sluice indicate different dominant mechanisms according to the change in sluice operation. Thirdly, sluice operation leads to stronger exchanges between the water body and external materials because of the increased water disturbance. Fourthly, in the early period of the experiment, changes in the alga concentrations were mainly affected by water movement. In the later period, changes in the alga concentrations were mainly affected by the obstruction of the sluice in the upstream section, while these were affected by flow velocity, flow volume, and changes in nutrient concentration in the downstream section.
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Affiliation(s)
- Ming Dou
- College of Water Conservancy and Environment, Zhengzhou University, No. 100 Kexue Road, Zhengzhou, Henan, 450001, China.
| | - Yaxin Cao
- College of Water Conservancy and Environment, Zhengzhou University, No. 100 Kexue Road, Zhengzhou, Henan, 450001, China
| | - Qingbin Mi
- Zhengzhou University Research Institute of Industrial Technology Co., Ltd, Zhengzhou, 450000, China
| | - Guiqiu Li
- College of Water Conservancy and Environment, Zhengzhou University, No. 100 Kexue Road, Zhengzhou, Henan, 450001, China
| | - Yanyan Wang
- College of Water Conservancy and Environment, Zhengzhou University, No. 100 Kexue Road, Zhengzhou, Henan, 450001, China
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Frémion F, Mourier B, Courtin-Nomade A, Lenain JF, Annouri A, Fondanèche P, Hak T, Bordas F. Key parameters influencing metallic element mobility associated with sediments in a daily-managed reservoir. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 605-606:666-676. [PMID: 28675876 DOI: 10.1016/j.scitotenv.2017.06.236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 06/23/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
In a hydroelectric reservoir, sediments are subject to remobilization events, water-level fluctuations and physicochemical changes. Depending on their associated metallic content, surficial oxic to suboxic sediments could constitute a major source of metals. To identify the key parameters that control metallic elements in terms of their mobility and sensitivity to reservoir management, sediments were subject to resuspension and drying/wetting cycle experiments over a wide range of pH values, solid/liquid ratios (S/L) and redox (Eh) conditions. During these tests, special attention was also paid to the influence of pretreatments on samples, i.e., drying, aeration and the leachate composition (ultrapure water vs. natural water); on the preservation of the sediment characteristics; and especially on metallic element release. The results of this study show that the pH, S/L ratio and Eh parameters are key variables in metal solubilization; the pH influences metal mobility primarily through sorption-desorption phenomena as well as the dissolution of metallic-bearing phases, the S/L ratio modifies the sorption-desorption equilibria, and the Eh primarily affects the reducible sensitive phases and associated metallic elements through dissolution-precipitation processes. Under environmental conditions, evolution of these parameters can lead to a >20% solubilization of the most mobile elements, i.e., As and Cd. These results are influenced by the sample pretreatment and experimental conditions. In fact, even if the solubilization patterns show no significant differences between dry and wet sediment depending on the physicochemical conditions, the magnitude of their release is significantly affected. Drying pretreatment induces changes in metal speciation, notably altering the distribution of the most weakly bound elements; there is almost half the amount of metallic elements associated with the exchangeable fraction in dry compared to wet sediments. The solubilization percentages were higher in the ultrapure phase than in reservoir water primarily due to the low pH, which influenced the sorption equilibria.
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Affiliation(s)
- Franck Frémion
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Brice Mourier
- Université de Lyon, UMR5023 Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, Université Lyon 1, ENTPE, CNRS, 3, rue Maurice Audin, 69518 Vaulx-en-Velin, France
| | - Alexandra Courtin-Nomade
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France.
| | - Jean-François Lenain
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Amal Annouri
- Université Polytechnique Mohammed VI, LOT 660 - Hay Moulay Rachid, 43150 Ben Guerir, Morocco
| | - Patrice Fondanèche
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Thierry Hak
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
| | - François Bordas
- Groupement de Recherche Eau Sol Environnement, Université de Limoges, 123 avenue Albert Thomas, 87060 Limoges Cedex, France
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Climate Change Impacts on Sediment Quality of Subalpine Reservoirs: Implications on Management. WATER 2017. [DOI: 10.3390/w9090680] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Zhang H, Jiang Y, Ding M, Xie Z. Level, source identification, and risk analysis of heavy metal in surface sediments from river-lake ecosystems in the Poyang Lake, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:21902-21916. [PMID: 28780687 DOI: 10.1007/s11356-017-9855-y] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 07/31/2017] [Indexed: 06/07/2023]
Abstract
The concentrations, sources, and risks of heavy metals (Fe, Al, Mn, Cr, Co, Ni, Cu, Zn, As, Cd, W, Pb, and Tl) in sediments in five river-lake ecosystems in the Poyang Lake region were studied. The concentrations of the heavy metals varied spatially, with most of the highest concentrations in the Raohe river-lake ecosystem (RH). All heavy metals except As, Cd, W, and Tl were enriched in sediments possessing high total organic carbon contents or in finer sediments. Based on enrichment factors and statistical methods, it was found that Cd in sediments in the Xiushui (XS), Ganjiang (GJ), Xinjiang (XJ) river-lake ecosystems, and RH; Mn in the XS, GJ, and RH; and W in the XS and GJ were greatly affected by anthropogenic inputs. Moreover, the origins of Cu, Zn, and As require more attention due to the high concentrations found. The high enrichment factor of Cd in the sediments indicated that this metal might cause significant pollution in the environment. The results of the modified potential ecological risk index revealed that the XS, GJ, RH, and XJ were at considerable ecological risk, while the sediments in the Fuhe river-lake ecosystem (FH) were at moderate ecological risk, with Cd contributing the highest proportion of risk. The hazard score fundamentally validated the modified potential ecological risk analysis and revealed a mean toxicity of 57.80% to the benthic organisms in the RH.
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Affiliation(s)
- Hua Zhang
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education (Jiangxi Normal University), Nanchang, Jiangxi, 330022, China
- School of Geography & Environment, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang, Jiangxi, 330022, China
| | - Yinghui Jiang
- School of Geography & Environment, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang, Jiangxi, 330022, China
| | - Mingjun Ding
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education (Jiangxi Normal University), Nanchang, Jiangxi, 330022, China
- School of Geography & Environment, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang, Jiangxi, 330022, China
| | - Zhenglei Xie
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education (Jiangxi Normal University), Nanchang, Jiangxi, 330022, China.
- School of Geography & Environment, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang, Jiangxi, 330022, China.
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Espa P, Brignoli ML, Crosa G, Gentili G, Quadroni S. Controlled sediment flushing at the Cancano Reservoir (Italian Alps): Management of the operation and downstream environmental impact. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 182:1-12. [PMID: 27448244 DOI: 10.1016/j.jenvman.2016.07.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 07/06/2016] [Accepted: 07/09/2016] [Indexed: 06/06/2023]
Abstract
Sediment flushing may be effective to preserve reservoir storage, but concerns arise about sustainability for downstream freshwater ecosystems. We report on the controlled flushing of approximately 110,000 tons of silt from a 120 Mm(3) reservoir on the Adda River, the main tributary of Lake Como, Italy. Technical constraints prevented flushing during high flows, and the operation had to be spread out over three consecutive years (2010-2012) and, for each year, over a rather long time span (40-50 days). To mitigate the downstream impact, the suspended sediment concentration (SSC) of the evacuated water was controlled by regulating the dislodging works inside the reservoir, increasing the streamflow in the regulated tributaries, and operating an instream settling basin. SSC and water flow as well as benthic macroinvertebrates and trout were monitored as far as 28 km below the reservoir. At the most upstream gauging station, SSC peaked up to 100 g/l and ranged from 3.5 to 8 g/l on average per each operation. Stream quality metrics based on macroinvertebrate data evidenced the impairment due to flushing; however, the benthic community showed high resilience, recovering to pre-flushing conditions in 6-9 months. Trout data were biased by stocking and sport fishing and were more difficult to be interpreted. The trout population wouldn't seem remarkably altered, even if a non-negligible impact could be deduced through pre/post-event sample comparison.
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Affiliation(s)
- Paolo Espa
- Department of Science and High Technology, University of Insubria, Via GB Vico 46, 21100 Varese, Italy.
| | - Maria Laura Brignoli
- Department of Science and High Technology, University of Insubria, Via GB Vico 46, 21100 Varese, Italy
| | - Giuseppe Crosa
- Department of Theoretical and Applied Sciences, University of Insubria, 21100 Varese, Italy
| | | | - Silvia Quadroni
- Department of Theoretical and Applied Sciences, University of Insubria, 21100 Varese, Italy
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