涓水下游某地沉积物的重金属污染评价

Assessment of Heavy Metal Contamination in Sediments from the Lower Reaches of Juanshui River

采集湘江支流涓水下游涓水二桥附近0-80 cm深的河流沉积物为样品,运用地累积指数法和潜在生态危害指数法对样品中Cr、Cu、Cd、Pb、Hg、As这6种重金属污染进行评价。结果表明:运用地累积指数法评价各重金属造成的危害由强至弱为Pb>As>Cd>Cr>Cu>Hg;运用潜在生态危害指数法评价各重金属造成的危害由强至弱为Cd>Hg>As>Pb>Cu>Cr;总体上,2种评价方法都呈现出随着深度的下降,重金属对土壤的危害程度降低的趋势。这对以后涓水流域重金属污染研究有一定的参考价值。

8 samples were collected from the 0-80 cm deep river sediments at sampling points near the second bridge in the lower reaches of Juanshui River,a tributary of Xiangjiang River,and the contents of Cr,Cu,Cd,Pb,Hg and As were detected.The geoaccumulation index and the potential ecological risk index were used to evaluate heavy metal pollution.The results suggested that the damage caused by heavy metals by geoaccumulation index was Pb>As>Cd>Cr>Cu>Hg.The potential ecological risk index method evaluated the damage caused by heavy metals as Cd>Hg>As>Pb>Cu>Cr.In general,the two evaluation methods showed a trend that the damage degree of heavy metals to soil decreased with the increase of depth.This has a certain reference value for the future study of heavy metal pollution in the Juanshui River basin.