Heavy Metals Pollution Status and Its Stability Assessment in Surface Sediments of Urban Lake-- A Case Study of Moshui Lake in Wuhan
城市湖泊表层沉积物中的重金属污染现状及其风险评价——以武汉墨水湖为例

Trace heavy metals can cause direct or indirect damages to aquatic ecosystem and human health. To evaluate the heavy metal pollution status of urban lakes, the concentrations and distribution of five trace metals Cr, Cu, Ni, Pb and Zn were detected in the surface sediments of Moshui Lake located in Wuhan City, and the pollution extent and stability were analysed. High pollution extent of heavy metal was found for the surface sediments in this urban lake. All these 5 trace metals'contents exceeded the least effect level(LEL)at all the sampling sites, with most of them exceeding the severe effect level(SEL). A distinct spatial heterogeneity was found in these heavy metals distribution, and the Stability Assessment Code(SAC)was in the order of Zn