南湾水库表层沉积物重金属污染及潜在生态风险评价

Heavy Metal Pollution in Sediments of Nanwan Reservoir and Assessment of Its Potential Ecological Risk

测定了南湾水库沉积物中5种重金属元素(Hg、Cd、Pb、As、Cu)的含量,并根据Hakanson潜在生态风险指数法对南湾水库沉积物中重金属污染元素导致的生态风险进行了分析。结果表明,各采样点Hg、As、Cd、Cu和Pb的含量范围分别为0.13～0.31mg/kg、10.01～19.45mg/kg、0.26～0.60mg/kg、24.17～39.67mg/kg和10.20～19.66mg/kg。西双河和马家畈有中度Hg污染;马家畈、潭石咀和夏家冲有中度As污染;西双河有中度Cd污染;西双河、马家畈、潭石咀和大庙有中度Cu污染。南湾水库沉积物重金属污染的潜在生态风险属轻微级别。

This experiment measured the contents of typical heavy metal pollutants（Hg,Cd,Pb,As,Cu） and analyzed the potential ecological risks of heavy metal in the sediments of Nanwan reservoir using the index techniques of single factor and Hakanson ecological risk.The results showed that the contents of the five heavy metals were 0.13-0.31 mg/kg,10.01-19.45 mg/kg,0.26-0.60 mg/kg,24.17-39.67 mg/kg and 10.20-19.66 mg/kg.There were moderate Hg pollution in Xishuanghe and Majiafan,moderate As pollution in Majiafan,Tanshizui and Xiajiachong,moderate Cd pollution in Xishuanghe,moderate Cu pollution in Xishuanghe,Majiafan,Tanshizui and Damiao,and moderate Pb pollution in Majiafan.The potential ecological risk of heavy metal pollution in the sediments of Nanwan reservoir was in the light rank.