成都市河流表层沉积物重金属污染及潜在生态风险评价

Pollution of heavy metals in the surface sediments from rivers in Chengdu and their potential ecological risk

根据流经成都市内的三条河流(府河、南河、沙河)表层沉积物重金属数据,采用Hakanson潜在生态危害指数法对重金属的潜在生态风险进行了评价。结果表明(1)重金属潜在的生态危害因子(Eri)说明大多属于轻微生态危害范畴,产生生态危害的主要重金属是Hg、Cd,Cu、Pb次之,As影响最小;(2)多种重金属的生态系统的潜在生态风险指数(RI)表明河流重金属污染属于轻微生态危害和接近中等生态危害,其受危害程度由强至弱的次序为:府河,南河,沙河。

Based on the data of heavy metals in the surface sediments from three rivers in Chengdu, which include the Shahe river, Fuhe river and Nanhe River, the potential ecological risk of heavy metals were analyzed and assessed by using the method of potential ecological risk indices presented by Hakanson. The results shows that （ 1 ） The contamination factor （Er^i） of surface sediments from rivers is light and the main factor caused ecological hazard is mercury and cadmium, following by copper, lead and Arsenic. （ 2 ） The contamination level of surface sediments are from light to moderate; Fuhe river is more serious than Nanhe river and Shahe river.