宝鸡市街尘重金属元素含量及其环境风险分析  

Analysis of Content and Environmental Risk of Heavy Metal Elements in Street Dust of Baoji City

作　　者：王利军[1] 卢新卫[1] 雷凯[1] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安710062

出　　处：《土壤通报》2012年第1期200-205,共6页Chinese Journal of Soil Science

基　　金：教育部新世纪优秀人才支持计划(NCET-05-0861)项目;陕西师范大学青年基金资助项目资助

摘　　要：分析了宝鸡市街尘中重金属元素的含量,结果表明：宝鸡市街尘中Cu、Pb、Zn、Cr、Cd、As和Hg的平均含量分别为123.2、408.4、715.1、126.7、5.5、19.8和1.1μg g-1。在工业区、交通区及商业区,除Cr和As略微高于陕西省土壤元素背景值（1.6~2.2倍）,其他重金属元素均远远高于陕西省土壤元素背景值（5~64倍）。不同功能分区街尘中重金属元素含量存在显著差异,Hg在交通区含量最高,其他重金属元素均在工业区最高。地累积污染指数法的评价结果表明,宝鸡市街尘中除Cr和As的污染较轻外,其他重金属元素的污染均比较严重,尤其是Cu和Pb在工业区尤为突出。潜在生态风险指数法的评价结果表明,宝鸡市街尘中重金属元素的污染水平和生态危害达到了严重程度,其中,Cr和As属于中等污染,其他重金属元素达到了重度以上污染,Cu、Zn、Cr、As和Pb属于中等潜在生态危害,Hg和Cd达到严重潜在生态危害。The content of heavy metal elements in street dust of Baoji City was analyzed by XRF, AAS, and AFS, and the results shown that the mean concentrations of Cu, Pb, Zn, Cr, Cd, As, and Hg were 123.2, 408.4, 715.1, 126.7, 5.5, 19.8 and 1.1 μg g^-1, respectively. Compared with Shaanxi Soil Element Background Values （SSEBV）, they were very higher （5 - 64 times） than SSEBV in industry, traffic, and commerce districts, except for Cr and As （1.6 - 2.2 times）. The spatial distribution of heavy metal elements was that all analyzed heavy metals were highest in industrial district, except for Hg in traffic district. The environmental risk of heavy metal pollution in street dust of Baoji City was assessed by Geo-accumulation Pollution Index and Potential Ecologically Risk Index. The assessment results of Geo-accumulation Pollution Index shown that the pollution level for Cu, Pb, Zn, Cd, and Hg was very higher than Cr and As, especially for Cu and Pb in industrial district. The Potential Ecologically Risk assessment results shown that the level of heavy metal pollution and ecological harm were above heavy. The pollution level for Cu, Pb, Zn, Cd, and Hg was very higher than Cr and As. The ecological harm of Hg and Cd was very heavier than Cu, Zn, Cr, and As.

关 键 词：街尘 重金属 地累积污染指数 潜在生态风险指数 宝鸡市 

分 类 号：X53[环境科学与工程—环境工程]