都江堰市城区周边农田土壤重金属污染状况分析与评价

Analysis and Assessment on Pollution Condition of Heavy Metals in Soil in the Farmland Around Dujiangyan City

以都江堰城区周边农耕地为对象,按照国标方法对土壤样本中的Cr、Cu、Cd、Pb、Zn五种重金属元素含量进行测定。结果表明,部分样本中的Cd、Cu含量超过国家土壤环境质量二级标准。采用单因子污染指数和土壤综合污染指数评价方法,以国家土壤环境质量二级标准为评价标准,对研究区内Cr、Cu、Cd、Pb、Zn重金属的污染状况进行评价,评价结果显示,Cu、Cd为主要污染元素,污染指数处于轻、中度污染,Cr、Pb、Zn对土壤尚未构成污染关系,研究区土壤重金属总体污染程度较轻。

In accordance with national standard methods,the content of the five heavy metals（Cr,Cu,Cd,Pb,Zn） in soil in the Farmland around Dujiangyan City were measured.The results showed that： Content of Cd,Cu in some samples exceeded the national standard value of soil environmental quality standard 2.With the second standard value for soil environmental quality as a assessment standard,using pollution indexes of single and comprehensive factors evaluation method,in the study area Cr,Cu,Cd,Pb,Zn status of heavy metal pollution evaluation,evaluation results：Only the content of Cu,Cd in the light and moderately polluted,as the main pollution elements,Cr,Pb,Zn are not pollution to soil,the overall pollution of heavy metals in study area is lighter.