乌江流域沉积物重金属污染特征及生态危害评价

Pollution of Heavy Metals in Sediments and Its Evaluation of Potential Ecological Harm in Wujiang River

根据2006年对乌江流域25个采样点沉积物中重金属的调查结果,对重金属含量分布及富集特征进行分析,并采用瑞典科学家Hakanson提出的潜在生态危害指数法对其生态危害程度进行评价。结果表明:在研究的区域内重金属中,Pb元素的富集度相对最高,其次是Hg、Cu、Cd。从空间上看,潜在生态危害系数评价结果显示:Hg元素属于强生态危害,Cd属于中等生态危害,Pb和Cu属于轻度生态危害。

Based on analyzing the data of heavy metals in the sediments in the Wujiang River,the accumulating degree and the potential ecological risk of heavy metals were analyzed and assessed by using the method of accumulation coefficients and the method of potential ecological indices presented by Hakanson.The results showed that the accumulating degree of Pb appears high among all these heavy metal in sediment,As second and that of Hg,Cu and Cd.From space,the results of assessment of potential ecological risk demonstrated that Hg was belonged to the strong potential ecological risk level.Cd was belonged to the middling potential ecological risk level.Pb and Cu were belonged to the slight potential ecological risk level.