织金县无公害农产品基地土壤重金属含量分析与评价

Analysis and assessment of heavy metals of soil in pollution free agriculture product bases in Zhijin County

采用土壤重金属单因子污染指数和综合污染指数评价方法,通过对织金县规划的7个无公害农产品生产基地土壤中重金属(Hg、As、Cd、Cr、Pb、Cu)含量进行调查与分析。结果表明:有5个基地Cd的单因子污染指数已超过警戒线,1个基地Cu的单因子污染指数已超过警戒线,1个基地Cu的单因子污染指数已造成轻度污染;但所调查的7个基地中重金属综合污染指数均小1,符合无公害农产品土壤环境质量要求。

Contents of heavy metals Hg, As, Cd, Cr, Pb and Cu at seven pollution-free agriculture product bases in Zhijin County were analyzed and environmental quality of the soil was assessed by using the single-factor contaminant index and comprehensive pollution index methods. The results showed that the single-factor contaminant index of Cd at five bases exceeded the warning level, while that of Cu at one base exceeded and at another, lightly polluted. All comprehensive pollution index was under 1.0, meating requirements for producing pollution free food.