洞庭湖平原区耕地环境质量初步评价

对洞庭湖平原区城郊耕地土壤中重金属Hg、Pb、Cr、Cd、Cu以及类金属As进行分析和测定,并对土壤重金属污染进行了环境质量评价。结果表明:城郊耕地土壤中重金属含量分别为Hg0.26mg/kg、Pb106.24mg/kg、Cr88.89mg/kg、Cd0.23mg/kg、Cu50.55mg/kg、As11.15mg/kg。与土壤背景值相比,除As外,5种重金属在土壤中均有不同程度的富集。耕地重金属污染物超标以铅、铜为主,镉、汞次之,其它元素均未超标。土壤综合污染指数为1.02,属轻度污染。

Primary Appraisal on Environmental Quality of Cultivated Land in Dongting Lake Plain

The heavy metals Hg, Pb, Cr, Cd, Cu and As were determined in cultivated land in Dongting Lake Plain. The appraisal for heavy metals pollution was made . Result indicated that the content of heavy metal was 0.23mg/kg for Cd, 0.26 mg/kg for Hg, 88.89 mg/kg for Cr, 106.24 mg/kg for Pb, 50.55 mg/kg for Cu ,11.15 mg/kg for As. The content of As was a bit lower than the background content. But the other five heavy metals has accumulated in different degree in tillable field. The heavy metal pollutants are mainly Pb and Cu, Hg and Cd secondary, Cr and As are under the polluted level. The comprehensive pollution indictor of the farm soils was 1.02, which is a trivial pollution grade.