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博斯腾湖表层沉积物重金属污染特征及等级评价
刘子龙, 闫豫君, 鲁建江, 刘锦花, 陈炳铭
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博斯腾湖表层沉积物重金属污染特征及等级评价
Pollution characteristics and pollution degree assessment of heavy metals in surface sediments from Bosten Lake
The concentrations and distribution characteristics of seven heavy metals ( Cu,Pb,Zn,Cr,Ni,Cd and Mn) were analyzed in fifteen surface sediment samples from Bosten Lake in Xinjiang Province in Northwest China,in order to evaluate pollution levels of heavy metals in the surface sediments in Bosten Lake ( Big lake area) .Heavy metal pollution in the sediments from Bosten Lake was analyzed and evaluated using geoaccumulation index( Igeo ) and potential ecological risk index( RI) .The results indicated that the concentrations of Cu,Ni,Mn and Cr in surface sediments from Bosten Lake were lower than the background values of soil in Xinjiang Province. The concentrations of Zn,Cd,and Pb were 2. 1,5. 1 and 2. 6 times higher,respectively,in surface sediments from Bosten Lake than the background concentrations.This indicates that there is a clear cumulative effect of Zn,Cd,and Pb.The distribution of various heavy metal contents reveals the regional distributive characteristic,the concentrations of seven heavy metals were obviously higher in west-center of Bosten Lake.According to the geoaccumulation index,the pollution degree of heavy metals in the surface sediments from Bosten Lake ranged from no pollution to moderate pollution,the pollution degree of Cd was the most serious.The potential ecological harm degree of heavy metal pollution in the surface sediments from Bosten Lake followed a descending order as: Cd>Pb>Cu>Ni>Zn>Mn>Cr,the potential ecological risks caused mainly by Cd.40% of the sites had reached up to the slight ecological harm,60% of the sites had reached up to the moderate ecological harm
重金属 / 污染特征 / 污染评价 / 沉积物 / 博斯腾湖 {{custom_keyword}} /
heavy metals / pollution characteristics / pollution assessment / sediment / Bosten Lake {{custom_keyword}} /
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