废弃矿区土壤重金属污染程度及生态风险评价研究

采用内梅罗指数法、地累积指数法对废弃矿区土壤重金属污染程度进行分析，并用潜在生态危害指数评价生态危害情况。研究结果表明，内梅罗指数法筛选Zn、Pb、Cd、As是主要污染因子，综合污染指数分别为16.30、9.48、20.16和7.07，属于重度污染；除点位11、12和14以外，其他11个点位的污染程度均为重度污染。地累积指数法筛选出Zn、Pb、Cd三种元素，未污染的元素为Ni、Hg、Cr、Ag，主要的污染点位是点位1、2、3。潜在生态危害指数法评价结果表明，主要污染因子为Cd、Hg两种元素，轻度污染的元素为Zn、Pb、Cu、As、Ni、Cr，主要的污染点位是点位1、2、3。

Study on degree of heavy metal pollution and ecological risk assessment in soil of abandoned mining area

The pollution degree of heavy metals in the soil of abandoned mining area was analyzed by Nemero index method and land accumulation index method，and the potential ecological risk assessment method was used to evaluate the ecological hazards.The results showed that Zn，Pb，Cd and As were the main pollution factors by Nemero index method.The comprehensive pollution indexes were 16.30，9.48，20.16 and 7.07，which belonged to heavy pollution.Except for 11，12 and 14 points，the other 11 points were heavy pollution.Three elements，Zn，Pb and Cd，were screened out by land accumulation index method.The uncontaminated elements are Ni，Hg，Cr and Ag，and the main pollution points are 1，2 and 3.The evaluation results of potential ecological hazard index method showed that the main pollution factors are Cd and Hg，the light pollution elements are Zn，Pb，Cu，As，Ni and Cr，and the main pollution points are 1，2 and 3.