西安市二环内表层土壤重金属污染评价  

Assessment of heavy metal pollution in the urban topsoil of interior area of Xi'an

作　　者：陈秀端[1,2] 卢新卫[1] 杨光[1] 陈景辉[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062 [2]陕西教育学院环境与资源管理系,西安710061

出　　处：《干旱区资源与环境》2012年第11期81-86,共6页Journal of Arid Land Resources and Environment

基　　金：中央高校基本科研业务费专项(2010ZYGX014;GK200901008);教育部新世纪优秀人才支持计划项目(NCET-05-0861)资助

摘　　要：采用3S技术相结合的方法在西安二环内采集城市表层土壤样品78个,利用X-Ray荧光分析仪(XRF)测定土壤样品中Co、Cr、Cu、Mn、Ni、Pb、Zn、V等8种重金属元素的含量,将其与其他城市相比较,在此基础上进行污染评价。结果表明:西安二环内表层土壤中重金属Co、Cr、Cu、Mn、Ni、Pb、Zn、V的平均值分别为19.32、81.10、54.27、671.50、34.46、59.69、186.17、85.20mg.kg-1,均高于陕西省土壤背景值。西安二环内表层土壤中8种重金属综合污染水平属于中度污染。其中,56.41%的采样点为轻度污染,29.49%的采样点为中度污染,14.10%的采样点为重度污染。不同重金属元素呈现出不同的污染水平,Mn、Ni和V基本无污染累积,Co、Cu、Pb、Zn和Cr均有不同程度的污染,主要与工业生产、交通等人类活动有关。The systematic investigations were performed to evaluate concentrations and potential sources of urban topsoil in the interior area of the Second Ringroad of Xi＇an,Shaanxi Province.Combined with 3S technology,78 topsoil samples were collected from the interior area of the Second Ringroad,Xi＇an.Then the concentrations of copper（Cu）,cobalt（Co）,chromium（Cr）,manganese（Mn）,nickel（Ni）,lead（Pb）,zinc（Zn） and vanadium（V） were measured by X-ray fluorescence（XRF）.The contamination degree of 8 heavy metals was assessed according to the Muller index and Nemero index.The statistical results show that the mean of Co,Cr,Cu,Mn,Ni,Pb,Zn,V are 19.32,81.10,54.27,671.50,34.46,59.69,186.17,85.20 mg·kg^-1,respectively,which are higher than the background value of Shaanxi Province.This is especially true for Cu,Pb and Zn,which are 1.27-37.01、1.21-23.67 and 0.99-71.54 times their corresponding background values of Shaanxi soil.The integrated pollution level of topsoil samples collected from the interior area of the Second Ringroad in Xi＇an is moderate,of which 56.41% of the samples are slightly polluted,29.49% of sampling points are moderately polluted,14.10% of the sampling points are severe polluted.There is not obvious pollution for Mn,Ni,V,Cr;and the different accumulation levels of Co,Cu,Pb,Zn are related to transportation and other human activities.

关 键 词：表层土壤 重金属 污染 

分 类 号：X53[环境科学与工程—环境工程]