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Liao K, Li W, Huang Z, Lin S, Fu L, Liu W, Fang H, Deng H. Comprehensive evaluation of the distribution, transport and ecological risk of heavy metals in intra-urban river sediments using high-resolution techniques. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 361:124808. [PMID: 39182813 DOI: 10.1016/j.envpol.2024.124808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 07/26/2024] [Accepted: 08/22/2024] [Indexed: 08/27/2024]
Abstract
Determining the distribution trends, transport mechanisms, and ecological risks of heavy metals (HMs) in urban river sediments is essential for the government to conduct appropriate remediation work. In this study, we collected sediment cores from the Yayao Waterway in Foshan City, China. The vertical distribution profiles of dissolved and labile Fe, Mn, Cd, Zn, Cu, Cr, Ni, Pb, As, and Co in the sediments were obtained using the thin-film diffusive gradient (DGT) and high-resolution peeper (HR-Peeper) techniques. In addition, the transport rates, contamination levels, and ecological concerns of the HMs were evaluated using the European Community Bureau of Reference (BCR) sequential extraction technique, the DGT-induced sediment fluxes (DIFS) model, and multiple contamination evaluation metrics. The results showed that most of the DGT-labile HMs were associated with Fe/Mn (hydrogen) oxides, and in particular, Zn, Ni, and Cr showed a significant negative correlation with Fe/Mn (p < 0.001). Additionally, Cd had the highest bioavailability (89.17%), and its net diffusive flux at the sediment-water interface (SWI) was positive, which indicated a high release risk from the sediment. However, the R-value of Cd based on the DGT-induced sediment fluxes (DIFS) operation was extremely low, suggesting that although Cd had the biggest supply pool of releases, its release rate was slow. The majority of sampling sites had significantly higher total HM contents in the surface sediments than the background values. The HM contamination in the sediments originated from human activities, primarily from industrial enterprises and with a large contribution from both agricultural and domestic sources. The most polluted HM with the highest ecological danger was Cd, followed by Cu, Zn, Ni, and As when the results of the four pollution evaluation indicators were combined. Consequently, the risk of contamination by HMs in inner-city river sediments should receive more attention.
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Affiliation(s)
- Kang Liao
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling, South China University of Technology, Guangzhou, 510006, China
| | - Weijie Li
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling, South China University of Technology, Guangzhou, 510006, China; The Key Laboratory of Water and Air Pollution Control of Guangdong Province, State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou, 510535, China.
| | - Zhiwei Huang
- The Key Laboratory of Water and Air Pollution Control of Guangdong Province, State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou, 510535, China
| | - Shu Lin
- The Key Laboratory of Water and Air Pollution Control of Guangdong Province, State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou, 510535, China
| | - Lingfang Fu
- The Key Laboratory of Water and Air Pollution Control of Guangdong Province, State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou, 510535, China
| | - Wei Liu
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling, South China University of Technology, Guangzhou, 510006, China
| | - Huaiyang Fang
- The Key Laboratory of Water and Air Pollution Control of Guangdong Province, State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou, 510535, China
| | - Hong Deng
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling, South China University of Technology, Guangzhou, 510006, China.
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Deep SS, Nasnodkar MR. Metal speciation in sediments and bioaccumulation in edible bivalves to assess metal toxicity in a sand mining impacted tropical (Aghanashini) estuary, southern India. MARINE POLLUTION BULLETIN 2023; 194:115455. [PMID: 37651887 DOI: 10.1016/j.marpolbul.2023.115455] [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: 08/18/2022] [Revised: 08/21/2023] [Accepted: 08/23/2023] [Indexed: 09/02/2023]
Abstract
The study aims to understand the metal toxicity through the relationship between bioavailability in sediments and bioaccumulation in edible bivalves in an estuary subjected to extensive sand mining. The higher deposition of total Fe, Mn, Ni and Zn in the middle region (core M) was ascribed to estuarine processes and proximity to anthropogenic sources. EF revealed moderate to severe enrichment of Ni and Cu in sediments. Igeo showed moderate degree of pollution from Co, moderate to strong pollution from Ni and strong to extreme level of pollution from Cu. In core N, the average bioavailable concentration of Fe, Mn, Zn, Cu, Co and Ni was 1.76 %, 43.18 %, 59.14 %, 62.11 %, 60.42 % and 27.33 % respectively. The average bioavailable concentration of Fe (61.23 %), Mn (56.87 %), Cu (67.98 %), Co (69.77 %) and Ni (40.99 %) was higher in the core M as compared to core N except for Zn (56.98 %). The significant (>25.00 %) proportion of metals in bioavailable fractions in cores N and M construed their non-natural sources. Metal speciation study indicated bioavailability to fauna that likely to enhance by extensive sand mining. The level of Fe, Mn, Zn, Cu and Ni in Saccostrea cucullate, Meretrix casta and Villorita cyprinoides revealed toxicity to bivalves and probably to humans.
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Affiliation(s)
- Sarang S Deep
- Marine Science, School of Earth, Ocean and Atmospheric Sciences, Goa University, Taleigao 403206, Goa, India
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Ma X, Yang L, Liu E, Dai J. Evaluating the release risk of potentially toxic elements from sediments in the New Zhuzhao River Estuary of Nansi Lake, using high-resolution technology and sequential extraction. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:353. [PMID: 36725771 DOI: 10.1007/s10661-022-10832-z] [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: 05/11/2022] [Accepted: 12/10/2022] [Indexed: 06/18/2023]
Abstract
Potentially toxic elements (PTEs) re-release from sediment is an essential process in the sediment-water interface (SWI), especially for the influent river estuary as an important accumulation site. In this study, the diffusive gradient in thin films (DGT), high-resolution dialysis (HR-peeper) technique, and BCR sequential extraction were employed to evaluate the release risk of PTEs (As, Cu, Pb, Zn, Cd) in the New Zhuzhao River Estuary of Nansi Lake. Results showed that Cd existed primarily in the non-residual fraction (accounting for 59.87%), and the residual fractions of As, Cu, Pb, and Zn accounted for a greater proportion (12.65 to 33.07%). The mobility of Cd was the highest with a risk assessment code of 33.53% reaching the medium risk category. The resupply capacity calculated by CDGT/CDis showed that As was the largest, with an average value of 0.43, indicating the strongest release capacity of As from the sediment to pore water. Furthermore, the diffusive fluxes using DGT and HR-peeper showed that As possesses a much higher potential to release upward overlying water than other elements.
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Affiliation(s)
- Xuan Ma
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Liyuan Yang
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China.
| | - Enfeng Liu
- College of Geography and Environment, Shandong Normal University, Jinan, 250358, People's Republic of China
| | - Jierui Dai
- Shandong Institute of Geological Survey, Jinan, 250013, China
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Xu F, Jia Y, Wang Y, Zhang F, Li L, Li Y, Ren L, Wang D, Zhang T. Does sand mining affect the remobilization of copper and zinc in sediments? - A case study of the Jialing River (China). ENVIRONMENTAL RESEARCH 2021; 200:111416. [PMID: 34090892 DOI: 10.1016/j.envres.2021.111416] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/23/2021] [Accepted: 05/24/2021] [Indexed: 06/12/2023]
Abstract
It is generally accepted that the sand mining industry causes severe destruction in river basin environments. In this study, six sediment cores were collected, and sequential extraction was applied in conjunction with the diffusive gradients in the thin films (DGT) technique to explore the effect of sand mining on the remobilization of Cu and Zn in the sediments. The results showed that Cu and Zn were mainly bound in the residual fraction in the sediments. CDGT-Cu/Zn in the sediments presented obvious increasing trends at the bottom (-9 to -12 cm) at the four sites that experienced sand mining and a decreasing trend at the sites with no sand mining disturbance. Cu and Zn also tended to be transported from the sediments to the overlying water at the four sand mining sites. A correlation analysis found that F1 and F3 correlated well with CDGT-Cu/Zn, indicating that the water/exchangeable fraction and oxidized fraction were the main fractions that led to increases in DGT-labile Cu and Zn in the sediments. Further analysis found that the introduction of oxygen (O2) was the main reason for the simultaneous release of sulfur (S), Cu and Zn in the sediments, as indicated by the "dark area" of AgI gel appearing at the same position as the "hot spot area" of Chelex gel. Two main sand mining effects on the release of Cu and Zn were hypothesized: (1) intense sand disturbance leads to the transfer of the water/exchangeable fraction (F1) to the DGT-labile fraction and (2) O2 introduction promotes the reaction of stable sulfide (F3), thus transferring it to the DGT-labile fraction. The above results indicated that the sand mining industry should be paid much attention in the Jialing River, as it can obviously cause labile Cu and Zn release into the water.
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Affiliation(s)
- Fei Xu
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Yuting Jia
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Yu Wang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Fubin Zhang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Lijuan Li
- Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agriculture Sciences, Beijing, 100081, China
| | - Yunxiang Li
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Liping Ren
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Dan Wang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China
| | - Tuo Zhang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China; Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agriculture Sciences, Beijing, 100081, China.
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Zhu Y, Wang H, Lv X, Zhang Y, Wang W. Effects of biochar and biofertilizer on cadmium-contaminated cotton growth and the antioxidative defense system. Sci Rep 2020; 10:20112. [PMID: 33208871 PMCID: PMC7674410 DOI: 10.1038/s41598-020-77142-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 10/29/2020] [Indexed: 11/09/2022] Open
Abstract
Consistent use of large amounts of fertilizers, pesticides, and mulch can cause the accumulation of harmful substances in cotton plants. Among these harmful substances, cadmium (Cd), an undegradable element, stands out as being particularly highly toxic to plants. The objective of this study was to evaluate the ability of biochar (3%) and biofertilizer (1.5%) to decrease Cd uptake, increase cotton dry weight, and modulate the activities of photosynthetic and peroxidase (POD), superoxide dismutase (SOD), catalase enzyme (CAT) in cotton (Gossypium hirsutum L.) grown in Cd-contaminated soil (0, 1, 2, or 4 mg Cd kg-1 soil) in pots. These studies showed that, as expected, exogenous Cd adversely affects cotton chlorophyll and photosynthesis. However, biochar and biofertilizer increased cotton dry weight by an average of 16.82% and 32.62%, respectively. Meanwhile, biochar and biofertilizer decreased the accumulation of Cd in cotton organs, and there was a significant reduction in the amount of Cd in bolls (P < 0.05). Biochar and biofertilizer have a positive impact on cotton chlorophyll content, net photosynthesis, stomatal conductance, transpiration rate, and intercellular CO2 concentration. Thus, the addition of biochar and biofertilizer promote cotton growth. However, biochar and biofertilizer increased the SOD activity of leaves (47.70% and 77.21%), CAT activity of leaves (35.40% and 72.82%), SOD activity of roots (33.62% and 39.37%), and CAT activity of roots (36.91% and 60.29%), respectively, and the addition of biochar and biofertilizer decreased the content of MDA and electrolyte leakage rate. Redundancy analyses showed that biochar and biofertilizer also improved SOD and POD activities by reducing the heavy metal-induced oxidative stress in cotton and reducing Cd uptake in cotton organs. Therefore, biochar and biofertilizer have a positive effect on the growth of cotton.
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Affiliation(s)
- Yongqi Zhu
- College of Agriculture, Shihezi University, Shihezi, 832003, Xinjiang, People's Republic of China
| | - Haijiang Wang
- College of Agriculture, Shihezi University, Shihezi, 832003, Xinjiang, People's Republic of China.
| | - Xin Lv
- College of Agriculture, Shihezi University, Shihezi, 832003, Xinjiang, People's Republic of China.
| | - Yutong Zhang
- College of Agriculture, Shihezi University, Shihezi, 832003, Xinjiang, People's Republic of China
| | - Weiju Wang
- College of Agriculture, Shihezi University, Shihezi, 832003, Xinjiang, People's Republic of China
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