泗河表层沉积物重金属污染特征及潜在生态危害评价

为研究泗河表层沉积物中重金属含量及其潜在生态危害程度，在泗河干流及支流共采集了7个底泥样品，分析测试了Hg、As、Cd、Pb、Cr、Ni、Cu、Zn、Mn共9种重金属元素，采用地累积指数法和潜在生态危害指数法对泗河表层沉积物中重金属的污染进行了分析和评价。结果表明，泗河表层沉积物中重金属污染主要以Hg和Cd为主。各种重金属的污染程度由强至弱依次为：Hg＞Cd＞Mn＞Zn＞Ni≈Pb≈Cu＞Cr＞As；各种重金属污染对泗河流域构成的潜在生态危害程度由强至弱的次序为：Hg＞Cd＞As＞Pb≈Cu＞Cr≈Zn。

Pollution Characteristic and Potential Ecological Risk Assessment of Heavy Metals in Surface Sediments from the Sihe River

In order to investigate the heavy metals concentrations and their potential ecological risks of the sediments in Si River, 7 sediments samples were sampled from both the trunks tream and tributaries for analyzing Hg, As, Cd, Pb, Cr, Ni, Cu, Zn and Mn. The Index of Geoaccumulation and the Potential Ecological Risk Index were employed to evaluate the pollution degree of heavy metals in the surface sediments. The results indicate that Hg and Cd are the predominant pollution elements. The descending order of pollution degree of various heavy metals is: Hg＞Cd＞Mn＞Zn＞Ni≈Pb≈Cu＞Cr＞As; the potential ecological risk intensity caused by different heavy metal is: Hg＞Cd＞As＞Pb≈Cu＞Cr≈Zn.