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《Earth and Environment》 2009-04
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Comparison of Heavy Metal Contaminations in Different Ranking Urban Soils:A Case Study of Zhengzhou,Zhongmu and Hansi,Henan,China

CHU Chun-jie1,MA Jian-hua2,and ZHU Yu-tao3(1.Department of Environment and Geography,Pingdingshan University,Pingdingshan 467000,China;2.Institute of Natural Resources and Environment science,Henan University,Kaifeng 475004,China;3.Maritime Bureau of Zhenjiang,Jiangsu Province,Zhenjiang 212000,China)  
An attempt was made to investigate heavy metal pollution in urban soils as exemplified by Zhengzhou City,Zhongmu County and Hansi Town,which share similar natural conditions but have different levels of urbanization and industrialization.The contents of Pb,Cd,Cu,Zn,Cr and Ni in soil samples,collected from these areas mentioned above,were analyzed through indoor determination.By adopting the approach of index of geoaccumulation,the results showed that:(1) The main contaminated elements in urban soils are Pb,Cd,Zn and Cr.However,there does not basically exist exogenous accumulation of Cu and Ni.Due to artificial disturbance,heavy metals in urban soils show great variability.(2) Pollution of Pb and Cd is chiefly caused by waste gases from traffic transportation and industrial activities,and Zn pollution is mainly caused by residential daily lives,traffic transportation and industrial activities.The pollution degree of heavy metals in industrial districts,traffic areas and residential regions is obviously higher than that of other urban functional types.(3) The accumulated pollution of Pb and Cd in these study areas follows the order of Zhengzhou CityHansi TownZhongmu Countycontrasted area,and Zn follows the order of Zhongmu CountyZhengzhou CityHansi Towncontrasted area,but Cr pollution among these three town areas changes little,with the exception that Cr pollution is slight in the contrasted area.Differences in heavy metal contaminations for the three urban soils are due to long-term accumulation effects of human activities as well as urbanization and industrialization in recent years.
【Fund】: 河南省重点科技攻关项目(0721021500)
【CateGory Index】: X53
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