海南省文昌市水稻土重金属污染评价

Assessment on Heavy Metals Pollution of Paddy Soil in Wenchang City,Hainan Province

[目的]了解文昌市水稻土的重金属含量及污染状况。[方法]通过调查、采样和实验室分析,采用单因子污染指数法和内罗梅综合指数法进行评价。[结果]文昌市水稻土重金属Hg、Cr含量的平均值均高于全国土壤元素环境背景值。而重金属Cd、Pb、As含量的平均值均低于全国土壤元素环境背景值。文昌市表层土壤部分重金属的含量之间存在一定的相关性,Pb和Cr之间存在显著相关性(P<0.01),而Pb与Hg和Cd之间存在显著相关性(P<0.05)。从单项污染指数来看,文昌市水稻土各类重金属的污染指数平均值均小于1;从综合污染指数来看,文昌市水稻土综合污染指数平均值为0.29,属于安全级别。[结论]文昌市水稻土重金属含量状况处于较安全的水平。

[ Objective ] The research aimed to study the contents and pollution of heavy metal in the paddy soil of Wenchang City. [ Method] Investigation, sample collection and analysis had been made, as well as the single factor pollution index and Nemoro synthesis index had been adopted to evaluate heavy metal content in Wenchang. [ Result] Average contents of heavy metals Hg, Cr in Wenchang City paddy soil were higher than those of the corresponding elements of the national soil environmental background values, but Cd, Pb, As average contents in the soil were below the national soil environmental background values of heavy metals in soil. Some heavy-metal contents of surface soil had a certain degree of relevance. Pb and Cr had the significant correlation, while there was a significant correlation between Pb and Cd, Hg. Pollution index from the individual point of view, the city of the paddy soil category average pollution index of heavy metals were less than 1. The integrated pollution index of paddy soil on average reached 0.29, belonging to the security level. [ Conclusion ] The contents of heavy metals in Wenchang paddy soil were in safe level.