大伙房水库表层沉积物重金属污染及潜在生态风险评价

大伙房水库是辽河流域典型水库饮用水源地。由于汇水区周边工矿废水的排放，重金属污染问题一直比较突出。为研究水库受重金属污染影响的情况，采用Hakanson潜在生态风险指数法对大伙房水库表层沉积物中重金属Cr、Cu、Zn、Cd、Pb的含量及分布进行分析，并对其污染程度及潜在生态风险危害进行评价，评价结果用地累积指数法进行验证。结果表明：大伙房水库表层沉积物中潜在生态危害最大的重金属元素为Cd，5种重金属元素潜在生态风险危害程度由大到小的顺序为Cd＞Cu＞Pb＞Cr＞Zn。

Potential ecological risk assessment of heavy metal pollution in surface sediment of the Dahuofang reservoir

The Dahuofang reservoir is a typical drinking water source in the Liaohe River basin. However, the heavy metal pollution is an important problem for the Dahuofang reservoir due to waste water discharges from the surround industrial enterprises. The contents and distribution of the heavy metal in the surface sediment of reservoir such as Cr, Cu, Zn, Cd and Pb were analyzed by a Hakanson potential ecological risk index method in order to study pollution situation. The pollution extent and potential ecological risk were evaluated, and the evaluation results were tested by a geoaccumulation index method. The results indicate that Cd is the primary pollution element of potential ecological risk in surface sediment of the Dahuofang reservoir. The ecological risk order of five pollution elements is as follows: Cd>Cu>Pb>Cr>Zn.