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Li S, Yang C, Peng C, Li H, Liu B, Chen C, Chen B, Bai J, Lin C. Effects of elevated sulfate concentration on the mobility of arsenic in the sediment-water interface. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 154:311-320. [PMID: 29482126 DOI: 10.1016/j.ecoenv.2018.02.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 02/11/2018] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
The adsorption/desorption of arsenic (As) at the sediment-water interface in lakes is the key to understanding whether As can enter the ecosystem and participate in material circulation. In this study, the concentrations of As(III), total arsenic [As(T)], sulfide, iron (Fe), and dissolved organic carbon (DOC) in overlying water were observed after the initial sulfate (SO42-) concentrations were increased by four gradients in the presence and absence of microbial systems. The results indicate that increased SO42- concentrations in overlying water triggered As desorption from sediments. Approximately 10% of the desorbed As was desorbed directly as arsenite or arsenate by competitive adsorption sites on the iron salt surface; 21% was due to the reduction of iron (hydr)oxides; and 69% was due to microbial activity, as compared with a system with no microbial activity. The intensity of microbial activity was controlled by the SO42- and DOC concentrations in the overlying water. In anaerobic systems, which had SO42- and DOC concentrations higher than 47 and 7 mg/L, respectively, microbial activity was promoted by SO42- and DOC; As(III) was desorbed under these indoor simulation conditions. When either the SO42- or DOC concentration was lower than its respective threshold of 47 or 7 mg/L, or when either of these indices was below its concentration limit, it was difficult for microorganisms to use SO42- and DOC to enhance their own activities. Therefore, conditions were insufficient for As desorption. The migration of As in lake sediments was dominated by microbial activity, which was co-limited by SO42- and DOC. The concentrations of SO42- and DOC in the overlying water are thus important for the prevention and control of As pollution in lakes. We recommend controlling SO42- and DOC concentrations as a method for controlling As inner-source pollution in lake water.
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Affiliation(s)
- Shiyu Li
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China; Institute of Environment Sciences, Department of Biology Science, University of Quebec at Montreal, Montreal, Canada C3H 3P8
| | - Changliang Yang
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China.
| | - Changhui Peng
- Institute of Environment Sciences, Department of Biology Science, University of Quebec at Montreal, Montreal, Canada C3H 3P8
| | - Haixia Li
- Institute of Environment Sciences, Department of Biology Science, University of Quebec at Montreal, Montreal, Canada C3H 3P8; Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
| | - Bin Liu
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China
| | - Chuan Chen
- Institute of International rivers and eco-security, Yunnan University, Kunming 650091, China
| | - Bingyu Chen
- Institute of International rivers and eco-security, Yunnan University, Kunming 650091, China
| | - Jinyue Bai
- Institute of International rivers and eco-security, Yunnan University, Kunming 650091, China
| | - Chen Lin
- Institute of International rivers and eco-security, Yunnan University, Kunming 650091, China
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Zhang E, Liu E, Shen J, Cao Y, Li Y. One century sedimentary record of lead and zinc pollution in Yangzong Lake, a highland lake in southwestern China. J Environ Sci (China) 2012; 24:1189-1196. [PMID: 23513438 DOI: 10.1016/s1001-0742(11)60896-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Reconstruction of trace metal pollution histories and sources may help us to regulate current pollutant discharge. This is especially important for the highland lakes in southwestern China, which are facing trace metals pollution. We present sedimentary records of 11 metals accumulated in Yangzong Lake since the 1870's, a highland lake in southwestern China. Pollution of lead and zinc (Pb and Zn) was differentiated based on principal component analysis, geochemical normalization, and lead isotope ratios. Nearly all the metals as well as grain size composition show generally constant values before the mid-1980's, denoting stable detrital input in the catchment. Fluctuations in the concentrations of the metals as well as grain size composition since the mid-1980's indicate an increase in soil erosion with strengthened human disturbance in the catchment. After geochemical normalization, Pb and Zn showed constant values before 1990 AD and then a gradual increase in parallel with the variations in 208Pb/206Pb and 207Pb/206Pb ratios, indicating that Pb and Zn pollution occurred. Combining the data of 208pb/206Pb and 207Pb/6Pb ratios in the sediments of Yangzong Lake, leaded gasoline, Pb-Zn ore and coal, and consumption or production historical trends, we deduced that the enhanced Pb and Zn pollution in Yangzong Lake is caused primarily by ore mining and refining.
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Affiliation(s)
- Enlou Zhang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
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