长江下游主要湖泊沉积物重金属污染及潜在生态风险评价

对巢湖、鄱阳湖和太湖表层沉积物中As、Cd、Cu、Hg、Zn、Ni、Cd和Pb等8种重金属污染特征进行了分析,并用Hkanson生态危害指数法评价其生态危害。结果表明,三大湖泊整个湖区中Hg和Cd含量的空间变化均较大,且含量均明显高于深层基准值。潜在生态风险评价结果显示,Hg和Cd所产生的生态风险危害程度在三大湖泊中均较高,为全区湖泊生态风险危害指数的主要贡献者,湖泊的生态风险性从低到高的排序分别是巢湖、太湖、鄱阳湖,巢湖和太湖的生态环境较好,鄱阳湖的生态环境相对较差。

Pollution of Heavy Metals in the Sediments from the Lower Reaches of the Yangtze River and Its Potential Ecological Risk Assessment

The pollution characteristics of As, Cd, Cu, Hg, Zn, Ni, Cd and Pb in the sediments of the Chaohu Lake, Poyang Lake and Taihu lake were analyzed, and the potential ecological risk of heavy metal pollution was assessed using Hakanson ecological risk index. The results showed that spatial variations in Hg and Cd contents were significantly higher than those in reference values. Potential ecological risk assessment results showed that the ecological risk of Hg and Cd produced by harmful levels was higher in the three lakes, which were a major contributor to ecological risk hazard index, the ecological risk follows the order of Poyang Lake > Taihu lake > Chaohu Lake,the ecological environments of the Chaohu Lake and Taihu lake were better, and that of the Poyang Lake was relatively poor.