title: Mobility and sulfidization of heavy metals in sediments of a shallow eutrophic lake, Lake Taihu, 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.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China. Electronic address: huoshouliang@126.com.
authors.forename: Shouliang
authors.initials: S
authors.lastname: Huo
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Jingtian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Yeager
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China. Electronic address: xibeidou@263.net.
authors.forename: Beidou
authors.initials: B
authors.lastname: Xi
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Yanwen
authors.initials: Y
authors.lastname: Qin
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Zhuoshi
authors.initials: Z
authors.lastname: He
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
authors.forename: Fengchang
authors.initials: F
authors.lastname: Wu
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical
keywords: DGT (diffusive gradients in thin films); Heavy metals; Sulfidization process