重庆都市经济圈土壤重金属的分布和评价

对重庆都市经济圈所包含的11区土壤中的As、Cd、Cr、Cu、Hg、Ni、Pb、Zn等8种重金属的分布状况进行调查评价。单因子污染评价结果表明,研究区内的重金属污染以Cd的污染最为严重。重金属污染的顺序为Cd>Ni>Cu>Cr>Zn>Hg>As>Pb。内梅罗综合污染指数评价结果表明,各区污染顺序为九龙坡区>渝北区>北碚区>沙坪坝区>江北区>巴南区>江津区>南岸区>长寿区>大渡口区>渝中区。研究区西北部污染情况最为严重,轻污染区主要分布在都市经济圈的西南、东南和东北。

Distribution and Evaluation of Heavy Metal in Chongqing Metropolitan Economic Circle

The soil of Chongqing metropolitan economic area has been studied to investigate the distribution and assess the heavy metals in 11 districts.The results of single-factor assessment showed that the primary heavy metal contamination was Cd.The degree of pollution followed the order as Cd>Ni>Cu>Cr>Zn>Hg>As>Pb.The Nemerow Synthetical Pollution Indexes showed that Jiulongpo was the heaviest pollution district in the study area.The order in decreasing degree of pollution of the districts was Jiulong-po,Yubei,Beibei,Shapingba,Jiangbei,Banan,Jiangjin,Nan'an,Changshou,Dadukou,Yuzhong.The most serious contamination was in the north west and the slight pollution area mainly in south west,south east and north east of the study area.