应用沉积物富集系数法和潜在生态风险指数法评价重庆梁滩河沉积物重金属污染风险.结果表明:整个梁滩河沉积物重金属均有不同程度的富集,单个重金属的富集程度由大到小依次为:Cd,Cu,As,Zn,Pb,Ni,Cr.沉积物中Cu,Zn和Pb出现富集,其主要来源为天然地球化学过程;Cr和Ni来源于人为源,但富集不大；Cd和As来源于人为源,且出现富集,应重点监控.以三峡库区土壤背景值为参比,除龙凤桥河段处于中等生态风险等级外,其他河段都处于生态风险强的等级；单个重金属元素的生态风险由大到小依次为:Cd,As,Cu,Pb,Ni,Zn,Cr.%Risk assessment of heavy metals pollution in the sediment of Liangtan River in Chongqing was done by application of sediment enrichment factors and potential ecological risk index, respectively. The results show that all the river sediments are at different enrichment levels, and heavy metal elements enrichment levels decline according to the sequence of Cd, Cu, As, Zn, Pb, Ni and Cr. The enrichments of Cu, Zn and Pb may be as a result of natural geochemical process, the enrichments of Cr and Ni are minor though they may come from the source of human activities, the enrichments of Cd and As are very serious and come from the source of human activities, and the assessment on the basis of background values of soil heavy metals in the Three Gorges Reservoir Region indicates that the surface layer sediment of Liangtan River, except Longfengqiao, represents higher ecological risks and the descending sequence of various heavy metals' ecological risks is Cd, As, Cu, Pb, Ni, Zn and Cr.
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