长株潭矿山土壤重金属的分布及污染评价

Distribution and pollution evaluation of heavy metals in mine soils of Chang-Zhu-Tan city region

对长株潭4个矿区尾砂矿土壤进行了5种重金属Cd、Pb、Cu、Mn、Zn含量的测定与分析,并采用单因子污染指数法和尼梅罗综合污染指数法对研究区域重金属污染进行评价。结果表明:4个矿区土壤N、P、K含量均没有达到植物正常生长土壤的水平。与湖南省土壤重金属元素背景值相比较,多数土壤重金属元素Pb、Cd、Mn、Cu、Zn含量都明显偏高,4个矿区不同类型土壤5种重金属的综合污染指数均>3,最高为931.2,最低为7.8,远远超过了重污染等级,其中以Cd的污染最严重。

The concentration of Cd,Pb,Cu,Mn,Zn in mine soils of Chang-Zhu-Tan city region were measured,and their pollution state was evulated by using the single-factor polluted index and N.L.Nemerow integrated polluted index.The results indicated that the concentration of N,P,K was not arrived the normal level in which plants would develop.Compared with the mean contents of these five heavy metals in soils in Hunan province,the Pb,Cd,Mn,Cu,Zn contents were obviously higher in four studied mines.The integrated polluted index of these five heavy metals were more than 3,the highest index was 931.2,the lowest index was 7.8.Cd heavy metal was mostly polluted in all soils.