江苏省东海县部分耕地土壤重金属分布与评价

Distribution and Evaluation of Contamination of Heavy Metals in Selected Farmland Soils in Donghai County of Jiangsu Province

通过对江苏省东海县部分无公害农产品生产基地进行监测,对该地区表层土壤重金属元素含量状况及其分布进行了分析与评价。结果表明。所监测的不同区域耕地土壤铜、汞、砷、铅、镉、铬含量变幅分别为12.04～27.39、0.016～0.190、3.39～8.00、21.18～34.60、0.060～0.233、44.1～79.4mg.kg-1,平均含量分别为19.68、0.036、6.17、25.64、0.11、61.56mg.kg-1。所监测的土壤铜、汞、砷、铅、镉、铬6种重金属单项污染指数Pi<1,综合污染指数P综≤0.7,污染程度呈由西向东逐渐加重趋势,但土壤重金属单项及综合污染指数均符合规定标准,表明所监测的耕地土壤重金属环境质量良好,符合无公害农产品生产基地重金属环境质量要求。

Pollution-free production bases were monitored and contents and distribution of several heavy metals in selected soils were analyzed and evaluated in Donghai county in the present study.The results showed that the content ranges of Cu,Hg,As,Pb,Cd,Cr were in a ranges of: 12.04～27.39;0.016～0.190;3.39～8.00;21.18～34.60;0.060～0.233;44.1～79.4 mg·kg-1;and the average contents were:19.68;0.036;6.17;25.64;0.11;61.56 mg·kg-1;respectively.Individual pollution index(Pi) <1 and comprehensive pollution index(Pc) ≤0.7 of Cu,Hg,As,Pb,Cd,Cr,the degree of pollution became stronger and stronger from the west to the east.But the Pi and Pc were normal and the farming soils could meet official criteria for pollution-free production bases.