海南省万宁市水稻土重金属污染的初步研究

Pollution of Heavy Metals in Paddy Soil in Wanning,Hainan Province

为调查万宁市水稻田土壤的重金属污染状况,在该地区12个乡镇的典型土壤中采集了19个混合土壤样本,并对各土壤样本中的重金属元素Hg、Cd、Cr、Pb和As的含量进行了测定。依据国家土壤环境质量二级标准,用单项污染指数法和内梅罗综合污染指数法评价土壤重金属的污染程度。结果表明:各乡镇水稻土壤均未受到重金属Hg、Cd、Cr、Pb和As的污染;从全市范围来看,综合污染指数仅为0.22,说明全市水稻土壤环境清洁,处于安全水平。

In order to investigate the condition of heavy metal pollution in the paddy soil in Wanning, 19 mixed soil samples were collected in the typical soils of 12 villages and towns, and their contents of Hg, Cd, Cr, Pb and As were detected. According to the second class standard of the national soil environment quality, pollution severity of heavy metals in the soil was evaluated by monomial pollution index method and Nemerow synthetic pollution index method. The results indicated that the paddy soils in Wanning were not polluted by Hg, Cd, Cr, Pb and As. From the whole area of Wanning the synthetic pollution index was only 0.22, indicating the paddy soil in the whole Wanning was clean and at a safe level.