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《Environmental Science》 2012-05
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Heavy Metals Pollution and Its Potential Ecological Risk of the Sediments in Three Gorges Reservoir During Its Impounding Period

WANG Jian-kang1,2,GAO Bo1,2,ZHOU Huai-dong1,2,LU Jin1,WANG Yu-chun1,2,YIN Shu-hua1,HAO Hong1,YUAN Hao1(1.Department of Water Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)  
In order to investigate the heavy metals concentrations and their potential ecological risks of sediments in Three Gorges Reservoir during its impounding period,24 sediment samples were collected from both the mainstream and tributaries for analyzing Cu,Pb,Zn,Cd,Ni,Cr,As and Hg.The index of geoaccumulation and the potential ecological risk index were then employed to evaluate the pollution degree of heavy metals in the sediments.The results indicate that the average contents of heavy metals in Three Gorges Reservoir: Cr is 86.31 mg·kg-1,Ni is 46.81 mg·kg-1,Cu is 76.03 mg·kg-1,Zn is 137.63 mg·kg-1,Cd is 0.75 mg·kg-1,Pb is 59.40 mg·kg-1,As is 18.07 mg·kg-1,Hg is 0.109 mg·kg-1,respectively.Average concentrations of heavy metals in sediments of Three Gorges Reservoir are relatively higher than those in sediment background of Yangtze River.The assessment by geoaccumulation index indicates that the pollution degree of heavy metals is: CdPbCuAsZnNiHgCr.The assessment by potential ecological risk index show that the potential ecological risk intensity caused by heavy metals is: CdHgCuAsPbCrZn,and Cd is the predominant element among them.In general,it is not significantly polluted during the impounding of Three Gorges Reservoir.
【Fund】: 国家水体污染控制与治理科技重大专项(2009ZX07104-001);; 水利部公益性行业科研专项经费项目(200901055)
【CateGory Index】: X524;X820.4
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