江苏昆山基本农田保护区土壤重金属含量分析与评价

本文对江苏省昆山市基本农田保护区52个监测点的土壤重金属含量进行了检测,检测项目为镉、铬、铅、汞、砷和pH,并用两种方法(土壤环境质量标准和土壤背景值标准)进行了评价。结果表明,除Cr以外,其他元素均已超出了该地区的平均背景值,超标程度依次为Hg>Pb>As>Cd,以土壤环境质量标准评价,其综合污染指数平均值为1.38,以土壤背景值为标准评价,其综合污染指数为1.17,污染水平及污染等级为轻污染。

The Analysis and Evaluation of the Content of Heavy Metal of Soil in the Basic Farmland Conservation Area in Kunshan County of Jiangsu Province,China

The analysis and evaluation of the content of heavy metal of soil in the basic farmland conservation area in Kunshan county of Jaingsu province, China is made in this paper. There are 52 monitoring sites and monitoring items and Cd, Cr, Pb, Hg, As and pH.Evaluation was made by using both standards of soil environmental quality and background values. The results indicated that the contents of heavy metal are above the natural background values except for Cr. The order is Hg>Pb>As>Cd. The soil's comprehensive pollution indicator, based on the soil environmental quality standard, was 1.38,while those, based on the background value standard, was 1.17.pollution grade was up to light pollution.