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以郴州废弃矿区土壤为研究对象,对矿区所采集的12个土壤样品进行重金属含量调查及综合污染程度分析,并采用地累积指数法对重金属污染程度进行评价。结果表明,土样中重金属Pb、Zn、Cd的平均含量分别为:3 149.36 mg/kg、3 848.75 mg/kg、26.74 mg/kg。Zn和Cd达到极严重污染程度,Pb达到强污染严重水平。采用BCR连续提取法对土壤中Pb、Zn、Cd三种重金属元素的形态进行分析,结果表明Pb主要以可还原态存在,Zn主要以残渣态存在,Cd主要以弱酸提取态存在。
Taking the soil of abandoned mining area in Chenzhou as the research object, 12 soil samples collected from the mining area were investigated for heavy metal content and the degree of comprehensive pollution, and the degree of heavy metal pollution was evaluated by using the cumulative index method. The results showed that the average contents of Pb, Zn and Cd in soil samples were 3 149.36 mg / kg, 3 848.75 mg / kg and 26.74 mg / kg, respectively. Zn and Cd reached very serious levels of pollution, Pb reached a severe level of strong pollution. The BCR continuous extraction method was used to analyze the forms of Pb, Zn and Cd in soil. The results showed that Pb mainly existed in reducible state, while Zn mainly existed in residual state, while Cd mainly existed in weakly acidic state.