湘江流域某冶炼厂周边土壤重金属含量检测及污染评价

来源期刊:中南大学学报(自然科学版)2013年第12期

论文作者:魏本杰 文新宇 朱生翠 曾晓希 汤建新

文章页码:5180 - 5188

关键词:土壤;重金属污染;评价;潜在生态危害

Key words:soil; heavy metal pollution; evaluation; potential ecological risk

摘    要:检测湘江流域某冶炼厂周边土壤中7种重金属元素(Cd,Pb,Cr,Cu,Zn,Ni,Hg)的含量,采用内梅罗单因子和综合因子污染指数法、Lars Hakanson潜在生态风险指数法对检测结果进行评价,并分析了2种环境评价方法的异同。内梅罗污染评价结果显示:土壤Cd污染程度最高,Zn和Hg已污染,Pb轻微污染,Cu,Ni和Cr等重金属未存在明显污染。Hakanson潜在生态风险指数法评价和前者评价结果的不同之处在于Zn的潜在生态风险较低,但是內梅罗污染评价结果较高。综合研究结果表明:采样区已受到重金属污染,存在一定的生态风险,对土壤污染较严重区域应予修复。

Abstract: The contents of heavy metals in the soil around one of the smelters beside Xiangjiang River including Cd, Pb, Cr, Cu, Zn, Ni and Hg were detected. The results of the test were evaluated with Nemerow single and comprehensive factor pollution index and Lars Hakanson’s ecological risk index which were subsequently studied on their similarities and differences as well. The outcomes from the former method show that the soil is polluted heavily by Cd, slightly by Pb, and also polluted by Zn and Hg but there is almost no pollution from Cu, Ni and Cr. However,compared with the higher Zn content obtained by Nemerow method, Hakanson’s ecological risk index method shows a low potential ecological risk due to Zn. The comprehensive studies indicate that the area of sampling is polluted by heavy metals with ecological risk, hence some measures should be taken to repair the soil in the areas with serious pollution.

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