TRACE ELEMENTAL CONCENTRATIONS INTHE SOIL OF THE URBAN-RURAL FRINGE ZONE: POLLUTION ASSESSMENT,SPATIAL DISTRIBUTION AND SOURCE APPROXIMATION Xianghong Liu,Linhua Sun,Haitao Zhang

摘要

Soil pollution in the urban-rural fringe zone is of great significance in current China.In this study,a total of 124 surface soil samples in the urban-rural fringe zone in Suzhou,northern Anhui province,China have been collected and measured for the concentrations of seven kinds of elements (Cr,Cu,Fe,Mn,Pb,V and Zn),the results indicate that the elements have the following decreasing order: Fe > Mn > V > Cr > Zn > Cu > Pb,and their mean concentrations are 27829,564,75.3,59.1,47.9,23.5 and.13.1 mg/kg,respectively.Based on the results of single pollution,the geo-accumulation and the Nemerow composite indexes,most of the samples show noslightly pollution.The spatial distributions of the elemental concentrations,along with statistical analyses,imply that two sources are responsible for the elemental concentrations in the soils,the geogenic (mainly Cr,Fe and V) and anthropogenic (mainly Pb,Mn,Zn and Cu),and their mean contributions are calculated to be 53.4% and 46.6%,respectively.