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《Journal of Safety and Environment》 2012-02
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Heavy metal ingredient analysis in the dust of the Chinese urban areas

LEI Lei1,CHEN Yu-cheng2,LI Zhang-ping3,LI Cai-fa4(1 College of Resources & Environment,Southwest University,Chongqing 400716,China;2 Chongqing Key Lab of Agricultural Resources & Environment,Chongqing 400716,China;3 Library of Southwest University,Chongqing 400716,China; 4 The People's Government of Changning Municipality,Changning 421500,Hunan,China)  
The present paper intends to provide a heavy metal ingredient analysis in the dust of the Chinese urban streets based on the 3 720 samples collected from 39 large and media-sized cities in China.The results of our synthetic analysis indicate that the average content of eight heavy metals, such as that of As,Cd,Cr,Cu,Hg,Ni,Pb,Zn in the dusts over the streets of the above mentioned cities are respectively 17.82 mg/kg,3.67 mg/kg,152.85 mg/kg,143.58 mg/kg,0.66 mg/kg,46.74 mg/kg,220.88 mg/kg,602.30 mg/kg.The primary analysis findings also reveal that the distribution of such metals are in great variety and in skewed manner.Except for those of As,Cr and Hg,the ingredients of other metals prove to be lower than those in similar-sized cities of other countries.However,the ingredients of Cd,Hg and Pb tend to be the most severe pollutants in accordance with the related concentration coefficients.As to the Nemerrow index,geoaccumulation index and the potential ecological risk index,it is possible to divide the 39 cities involved into four types,that is,those extremely heavily contaminated by Cd-Hg-Pb-Zn-Cu(such as Tongling,Guangzhou,Zhuzhou,Xiangtan,Huizhou,Shaoguan),those 15 cities severely contaminated by Cd(such as Nanjing,Shanghai,Beijing,Wuhu,Shenyang,Hong Kong,Shijiazhuang,Hangzhou,Hefei,Urumqi and so on),and those seriously contaminated with Pb-Zn-Cu(e.g.Chengdu,Jinhua,Zhenjiang) and the rest 15 cities medium contaminated with the rest heavy metals involved.Generally speaking,cities in China south are more severely contaminated with heavy metals than those in the north.In addition,biggest cities are less contaminated with Cd,Hg,Cu and Zn than small towns,whereas biggest cities suffer worse contamination of Pb and Cr than those in towns.Besides,according to the functional zones,the contamination extent can also be categorized in the following order: industrial district residential area shopping centre scenic spots.
【Fund】: 西南大学博士基金项目(100112)
【CateGory Index】: X502
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