新乡市居民小区土壤几种主要重金属元素含量水平及风险评价

Heavy Metals Content and Ecological Risk Assessment in Soil of Residential Areas in Xinxiang City

利用原子吸收对新乡市居民小区表层土壤的Pb、Cd、Cu、Zn的含量进行了分析,阐明了这几种重金属元素的分布特征,并用单因子污染指数法,内梅罗综合污染指数法和潜在生态风险指数法对其进行了评价。结果表明:Pb在个别居民小区呈现富积现象,Cd、Zn在居民小区内的累积强度较大。新乡市居民小区土壤均受到重度污染,新乡市居民小区土壤潜在生态风险处于极高风险水平,各重金属元素的潜在生态风险指数大小顺序为Cd>Cu>Pb=Zn。

The contents of Pb,Cd,Cu,and Zn on the surface soil of living areas in Xinxiang City were analyzed by atomic absorption,and the distribution of these heavy metals was clarified.They were evaluated by single-factor pollution index method,Nemerow comprehensive pollution index method and potential ecological risk index method.The results showed that there was an accumulating phenomenon of Pb in individual community and the accumulation intensity of Cd and Zn in the community was high.Soil of Xinxiang City living areas had been seriously polluted.The potential risk of soil in Xinxiang City living areas was at a very high level.The potential ecological risk indices of these heavy metals were in the order of Cd Cu Pb = Zn.