摘要
Health implications of inhaling and/or ingesting dust particles with high concentrations of heavy metals from urban soils are a subject of intense concern. Understanding the geochemistry of these metals is key to their effective management. Total concentrations of heavy metals,phosphorus (P) and 8 other elements from topsoil samples collected at 82 locations in Hangzhou City were measured to:a) assess their distribution in urban environments; and b) understand their differentiation as related to land use. Metal mobility was also studied using a three-step sequential chemical fractionation procedure. About 8.5%,1.2%,3.6%,11.0% and 30.3% of the soil samples had Cd,Cr,Cu,Pb,and Zn concentrations,respectively,above their allowable limits for public and private green areas and residential use. However,in commercial and industrial areas,most samples had metal concentrations below their allowable limits. Statistical analyses revealed that the 16 measured elements in urban soils could be divided into four groups based on natural or anthropic sources using a hierarchical cluster analysis. Additionally,Cu,Pb,and P showed similar spatial distributions with significant pollution in commercial zones,suggesting vehicle traffic or commercial activities as dominant pollutant sources. Also,Cd,Co,Cr,Ni,Zn,Mn and Fe had the highest concentrations in industrial locations,signifying that industrial activities were the main sources of these seven metals. Moreover,the data highlighted land-use as a major influence on heavy metal concentrations and forms found in topsoils with large proportions of soil Cd,Co,Cr,and Ni found in residual fractions and soil Cu,Pb and Zn mainly as extractable fractions.
Health implications of inhaling and/or ingesting dust particles with highconcentrations of heavy metals from urban soils are a subject of intense concern. Understanding thegeochemistry of these metals is key to their effective management. Total concentrations of heavymetals, phosphorus (P) and 8 other elements from topsoil samples collected at 82 locations inHangzhou City were measured to: a) assess their distribution in urban environments; and b)understand their differentiation as related to land use. Metal mobility was also studied using athree-step sequential chemical fractionation procedure. About 8.5%, 1.2%, 3.6%, 11.0% and 30.3% ofthe soil samples had Cd, Cr, Cu, Pb, and Zn concentrations, respectively, above their allowablelimits forpublic and private green areas and residential use. However, in commercial and industrialareas, most samples had metal concentrations below their allowable limits. Statistical analysesrevealed that the 16 measured elements in urban soils could be divided into four groups based onnatural or anthropic sources using a hierarchical cluster analysis. Additionally, Cu, Pb, and Pshowed similar spatial distributions with significant pollution in commercial zones, suggestingvehicle traffic or commercial activities as dominant pollutant sources. Also, Cd, Co, Cr, Ni, Zn, Mnand Fe had the highest concentrations in industrial locations, signifying that industrialactivities were the main sources of these seven metals. Moreover, the data highlighted land-useas amajor influence on heavy metal concentrations and forms found in topsoils with large proportions ofsoil Cd, Co, Cr, and Ni found in residual fractions and soil Cu, Pb and Zn mainly as extractablefractions.
基金
Project supported by the Natural Science Foundation of Zhejiang Province, China (No. M403038).
关键词
重金属
磷
城市土壤
杭州
anthropogenic pollution
heavy metals
phosphorus
urban soils
