孝感市孝南区农业土壤重金属污染的初步评价

Primary Appraisal for Heavy Metals Pollution in Agricultural Soils of Xiaonan District of Xiaogan City

为调查研究孝感市孝南区的农业土壤重金属污染状况,在该区典型土壤中采集了11个混合土壤样本。通过原子分光光度计对各土壤样本的重金属元素Cd、Cu、Pb、Cr和Zn的含量进行了测定,并采用单项污染指数法和内梅罗综合污染指数评价该区农业土壤重金属污染程度。结果表明:以国家土壤环境质量二级标准评价,内梅罗综合污染指数为1.695,说明该区农业土壤普遍受到了重金属污染,其中Cd为中度污染,是主要污染物,Cu、Pb、Cr和Zn均为安全级(清洁水平)。

To investigate heavy metals pollution in agricultural soils of Xiaonan district in Xiaogan City, eleven soil samples were collected from representative sites in the district. The contents of heavy metals （Cd,Cu,Pb,Cr,Zn） in soil samples were determined by atomic adsorption spectrophotometry. By adopting both the single factor index method and Nemerow multi-factor index method, the pollution indexes were calculated to assess pollution extent. Based on official standard values of soil quality in China, the results indicated that the soils were contaminated compoundly and the average integrated pollution index of the district was 1.695, revealing that the soils having been inter-mediately contaminated by Cd, Cu including Pb, Cr and Zn at safe grade.