怀化市菜地土壤及蔬菜重金属污染状况调查与评价

对怀化市郊区主要蔬菜产区土壤、蔬菜中重金属(Pb,Cd,Cr,As,Hg)含量调查与分析,采用重金属单项污染指数评价方法,对土壤重金属污染状况进行评价,以国家规定的无公害蔬菜标准评价蔬菜重金属污染状况。结果表明,怀化市郊区蔬菜地土壤不同程度地受到重金属污染,依次是Cd>As>Cr>Hg>Pb;蔬菜除镉和铅含量超过国家规定的无公害蔬菜标准,其他几种重金属含量未超标。

Survey and Evaluation of Heavy Metal Contamination of Soils and Vegetables in Huaihua

The contents of heavy metal(Pb,Cd,Cr,As,Hg)in the soil and the vegetables in the main vegetable production area in Huaihuawere are examined and analyzed to evaluate the status of heavy metal contamination.The evaluation of the soil is by the means of single pollution index,the vegetables by terms of the standard of pollution-free vegetable.The results show that the soil are polluted in various degrees by heavy metals,in the order of Cd>As>Cr>Hg>Pb.The contents of heavy metals in fairly portion of the vegetables does not exceed the State's standard,but there are Cd and Pb indexes of the contents exceeded the State's standard.