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Mobility and sulfidization of heavy metals in sediments of a shallow eutrophic lake, Lake Taihu, China
作者姓名:Shouliang Huo  Jingtian Zhang  Kevin M. Yeager  Beidou Xi  Yanwen Qin  Zhuoshi He  Fengchang Wu
作者单位:State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,Department Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
基金项目:This study is supported by theMega-projects of Science Researchfor Water Environment Improvement (No. 2012ZX07101-002)and the National Natural Science Foundation of China (No.41303085).
摘    要:The technique of DGT (diffusive gradients in thin films) using three diffusive gel thicknesses was applied to estimate the mobility and bioavailability of heavy metals in sediments and porewater of Lake Taihu, China. The DGT results showed significantly positive correlations between Co, Pb, Cd and Mn, and Ni and Fe concentrations in porewater. Cu and Zn showed a significantly negative correlation with Mn, due to Cu combination with carbonates and Zn derived from agricultural pollution, respectively. The rank order of average concentrations of Co, Ni and Cd at each station was DGT1.92 >DGT0.78 >DGT0.39, suggesting stronger resupply from sediments to porewater when using thicker diffusive gels. Comparing centrifugation and DGT measurements, Co, Ni and Cd are highly labile; Mn and Fe are moderately labile; and Cu, Zn and Pb are slightly labile. The variations of AVS concentrations in sediment cores indicate that metal sulfides in deeper layers are easily diffused into surface sediments.

关 键 词:Sulfidization  process  Heavy  metals  DGT  (diffusive  gradients  in  thin  films)
收稿时间:2014/12/22 0:00:00
修稿时间:2014/12/24 0:00:00

Mobility and sulfidization of heavy metals in sediments of a shallow eutrophic lake, Lake Taihu, China
Shouliang Huo,Jingtian Zhang,Kevin M. Yeager,Beidou Xi,Yanwen Qin,Zhuoshi He,Fengchang Wu.Mobility and sulfidization of heavy metals in sediments of a shallow eutrophic lake, Lake Taihu, China[J].Journal of Environmental Sciences,2015,27(5):1-11.
Authors:Shouliang Huo  Jingtian Zhang  Kevin M Yeager  Beidou Xi  Yanwen Qin  Zhuoshi He and Fengchang Wu
Institution:State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,Department Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
Abstract:The technique of DGT (diffusive gradients in thin films) using three diffusive gel thicknesses was applied to estimate the mobility and bioavailability of heavy metals in sediments and porewater of Lake Taihu, China. The DGT results showed significantly positive correlations between Co, Pb, Cd and Mn, and Ni and Fe concentrations in porewater. Cu and Zn showed a significantly negative correlation with Mn, due to Cu combination with carbonates and Zn derived from agricultural pollution, respectively. The rank order of average concentrations of Co, Ni and Cd at each station was DGT1.92 >DGT0.78 >DGT0.39, suggesting stronger resupply from sediments to porewater when using thicker diffusive gels. Comparing centrifugation and DGT measurements, Co, Ni and Cd are highly labile; Mn and Fe are moderately labile; and Cu, Zn and Pb are slightly labile. The variations of AVS concentrations in sediment cores indicate that metal sulfides in deeper layers are easily diffused into surface sediments.
Keywords:Sulfidization process  Heavy metals  DGT (diffusive gradients in thin films)
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