南京市郊区基本农田保护区土壤重金属污染调查

为调查基本农田保护区土壤环境中重金属污染状况，江苏省农业环境监测站于1999年和2001年分别对南京市郊区基本农田土壤环境质量进行了监测，共计布设监测点14个，监项目为镉，铅，砷，汞，铬和pH，结果表明，1999年土壤样品的重金属检出率为97．1％，超标率为5．7％，2001年重金属检出率为100％，超标率为1．4％，1999年土壤样品中超标的重金属元素是镉，超标率为28．6％，2001年超标元素是汞，超标率为7．1％，1999年土壤综合污染指数为1．08，污染等级及污染水平均属轻污染；2001年土壤综合污染指数为0．76，污染等级为警戒线，污染水平达到尚清洁。

Investigation aboutthe Heavy Metal Pollution ofSoil in Basic Farmland Conservation Area on Nanjing Suburb

From 1999 to 2001, investigation about the heavy metal pollution of soil in basic farmland conservation area on Nanjing suburb was made. There were 14 monitoring sites, monitoring items were Cd, Pb, As, Hg, Cr and pH. Results indicated that in 1999, the detection rate of heavy metal was 97.1%, the nonattainment rate was 5.7%. In 2001, the detection rate of heavy metal was 100%, the nonattainment rate was 1.4%, the nonattainment element was Hg, its nonattainment rate was 7.1%. In 1999, the soil's comprehensive pollution indicator was 1.08, pollution grade was light pollution. In 2001, he soil's comprehensive pollution indicator was 0.76, pollution grade was up to warning grade.