萍乡蔬菜种植区土壤中重金属含量及潜在生态危害研究

摘要

为了解萍乡蔬菜种植区土壤环境质量和污染状况,采用综合污染指数法和潜在生态危害指数法对采样区土壤的环境质量进行了评价.结果表明,所有重金属的均值均未超过土壤环境质量标准中的二级标准,其单项污染指数依次为Hg>Ni>Cd>Cu>Zn>Pb>As>Cr,其中Cd、Hg、Pb、Ni含量均高于对应元素的江西省土壤重金属背景值,但土壤的综合污染指数和潜在生态危害指数都较低.总的来说,萍乡蔬菜种植区土壤环境质量处于清洁和安全范围内,生态风险较低.%In order to find out the heavy metals concentrations and their potential ecological risks of Top soil in Pingxiang's Vegetable Growing Areas, thirty top soil samples were collected from Pingxiang and analyzed for the concentrations of Cd, Hg, As, Pb, Cr, Cu, Zn and Ni. The Nemerow Synthetical Pollution Index and the Potential Ecologic Risk Index were then employed to evaluate the pollution degree of heavy metals in the top soil. The results of statistical analysis indicated that, among heavy met-als, the pollution of Hg is the most serious, and then followed by this order Ni>Cd>Cu>Zn>Pb>As>Cr. Except Cd, Hg, Pb and Ni, other heavy metals concentrations lower than the background levels in the area. The comprehensive assessment shows that the soil environmental quality of Top soil in Pingxiang is quite clean and safe.