矸石山周围土壤重金属污染的生态风险评价

Ecological Risk Assessment of Soils Polluted by Heavy Metals Around Coal Wastes Piles

为了解煤矸石堆放对周围土壤重金属污染的危害程度,对矸石山周围土壤采样分析,并采用Hakanson潜在生态风险指数法对土壤重金属污染进行了潜在生态风险评价。结果表明,煤矸石堆放对周围土壤造成重金属污染,其总的潜在生态风险程度为轻微,Pb的单个元素污染程度为很强,Cd是最主要的潜在生态风险因子。通过利用土壤背景值法和国家土壤标准法进行对比分析,表明Hakanson潜在生态危害指数法具有能同时兼顾两种评价方法的特点,可以较好地应用于矸石山周围土壤的评价。

Heavy metal elements were quantitatively analyzed in the soils around coal wastes piles. Potential ecological risk assessment of heavy metals pollution was performed by using Hakanson＇s ecological risk index. The results indicated heavy metal pollutions occurred in the soil around coal wastes piles. The degree of potential ecological assessment was light. Pb was worst of the degree of single element pollution .Cd was the worst of the potential ecological risk genes. At the same time, contrasted to the methods of soil background and nation＇s soil criterion, Hakanson＇s pollution ecological risk index was the best in the soil assessment around coal wastes piles, which has the characters of the methods of the soil background and the nation＇s soil criterion.