巴中市土壤重金属Cd、Pb的污染评价

论文通过对巴中市农田表层土壤重金属元素Cd、Pb的调查分析,采用单因子污染指数法、内梅罗污染指数法和地质累积指数法,对当地土壤重金属Cd和Pb进行了污染评价.单因子污染指数法与地质累积指数法评价结果一致表明:土壤Pb均未超标,安全等级为无污染.但单因子污染指数法与地质累积指数法对Cd的评价结果有明显差异,单因子污染指数法评价结果表明:Cd的安全等级为非污染,在Cd检测的344份样品中,Cd的超标率为11%;地质指数累积指数法评价结果表明:Cd的安全等级为轻污染,且样品超标率为32%.综合污染指数表明研究区Cd的污染级别为第三级别(污染程度为轻污染).所以应采取相关技术措施,防止重金属元素污染.

A Evaluate of Soil Lead and Cadmium Content in Rural Areas of Bazhong

In this paper,we made a pollution assessment toward the heavy metal elements Cd and Pb in the local soil with the method of single factor index evaluation method,Nemerow multi-factor index method and Geological accumulationpollution index method by means of Bazhong farmland surface soil heavy metal elements Cd and Pb investigation analysis.The evaluate results of the single factor index evaluation method and the Geological accumulationpollution index method consistently showed that:the soil Pb were not overweight,the safety level is no pollution.But the evaluation results of Cd have obvious difference between the single factor pollution index method and the geological accumulation index method,the evaluate result of the single factor index evaluation method showed that:the soil Cd's safety level is no pollution,the overproof rate is 11%among the 344detected samples of the Cd;the evaluate result of the geological accumulation pollution index method showed that:the soil Cd's safety level is light pollution,and the overproof rate of the samples is 32%.The Nemerow multi-factor index method showed the pollution level of the Cd in the research area was the third level(degree of contamination is light pollution).So measures to control the pollution of heavy metal elements in soil should be carried out.