贵阳市耕地土壤重金属分布特征及评价

Distribution and Evaluation of Heavy Metals in Cultivated Soil of Guiyang

对贵阳市4郊区1市3县耕地土壤重金属As、Pb、Cd、Cr、Hg污染现状进行了调查和分析。结果表明:土壤中重金属含量在地区内及地区间差异都较大,除Cr外,As、Pb、Cd、Hg富集度较高;1市3县是贵阳市主要工业区,土壤属轻度污染,明显高于4郊区;Cd元素污染十分突出,其次是Hg和As。分析认为磷化工、煤化工及铁合金等工业与之密切相关,需进一步深入研究。

Investigation and assessment of concentrations of heavy metals （As, Pb, Cd, Cr, and Hg） in the cultivated soils in Guiyang （including four suburbs, one city and three counties that are Huaxi, Wudang, Xiaohe and Baiyun District, Qingzheng City, Xi Feng, Kaiyang and Xiuwen County） were carried out. Results showed that the contents of heavy metals varied largely both within and between the regions. They were all relatively high, except Cr, in all the area investigated. The average contents of heavy metals in the main industrial areas including Qingzheng City and three counties were obviously higher than in the other areas of Guiyang. Cd was the most important contributor of heavy metal pollution of the soil and was followed by Hg and As, which was presumed to have resulted from the presence of phosphorus chemical industry, coal chemical industry and ferroalloy industry in those area.