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| Contents, Forms and Distributions of Heavy Metals in Surface Water and Sediments from Yangtze Estuary |
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| KeyWord:Yangtze estuary; sediment; heavy metals; fractions; ecological risk |
| Author Name | Affiliation | | LI Ting-ting | College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China | | WANG Jing-gang | College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China | | WANG Ying | The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China | | LI Li-fang | College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China | | YIN Shi-lei | College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: |
| Contents, forms and distributions of heavy metals（Cd, Cr, Cu, Hg, Ni, Pb and Zn） and metalloid As in surface water and sediments from the nearshore zones of the Yangtze Estuary were studied. Concentrations of all heavy metals and metalloid As in the surface water were lower than the Class I levels of GB 3838—2002 Surface Water Environment Quality Standards, whereas the mean concentrations of all metals in the sediments were higher in 2012 than in 2007. The concentrations of most metals in the sediments were higher from the southern than from the northern branch, due to more inputs of sewage and pollutants. The median concentrations of As, Cr and Ni in the sediments were higher than the threshold effect levels（TEL）, implying potential ecological risks. Fractionations showed that As, Cr and Ni in the sediments were mainly present in the residual fraction. High Cd in the exchangeable and carbonate bound fractions indicated a higher ecological risk. There were obviously positive correlations between all metals with an exception of Hg and As. All metals had positive correlations with active iron and aluminum oxides and Mn except Zn, and with TOC except Hg. |
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