龙井市近郊农田土壤重金属污染评价

目的]为了解吉林省龙井市近郊农田土壤中重金属污染状况。方法]结合国家《土壤环境质量标准（》GB15618-1995）中的二级标准,采用单因子污染指数法和内梅罗综合污染指数法,对龙井市近郊龙池村农田土壤中重金属铜、锌、铅、镉含量进行调查。结果]单因子污染指数大小顺序为镉〉锌〉铜〉铅,主要污染元素为镉。不同耕作类型旱田与水田土壤综合污染指数分别为1.341、.66。2种耕作类型土壤均超过警戒范围,为轻度污染,而水田土壤污染相对严重。结论]龙井市近郊农田土壤重金属综合污染指数为1.57,其污染状况为轻度污染。

Evaluation of Heavy Metal Pollutions in Farmland Soil of Suburb in Longjing City

Objective] The research aimed to study the heavy metal pollution status in farmland soil of suburb in Longjing City,Jilin Province.Method] The heavy metals(Cu,Zn,Pb and Cd) contents in farmland soil of Longchi village,Longjing City were evaluated based on the second grade of national soil environmental quality standard(GB15618-1995).Single factor pollution index and Nemerow integrated index were applied for the evaluation.Result] The single factor index was in order of Cd>Zn>Cu>Pb.Cd was found to be a major heavy metal contaminant in the soil.For the different farming types of dry land and paddy land,the integrated pollution index was 1.34 and 1.66 respectively.Both farming types were found to be above warning range and the pollution rankings were light.The paddy land was polluted more severely.Conclusion]The integrated pollution index in the farmland of suburb in Longjing City was 1.57 and the pollution ranking was light.