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《Environmental Science and Management》 2017-05
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Sedimentation Flux and Its Evaluation of Dry and Wet Atmospheric Deposition of Heavy Metal Elements in North Tianjin

Wang Weixing;Cao Shuping;Li Gongke;Zhang Yana;Tianjin Institute of Geological Survey;  
Dry and wet deposition is an important way for harmful substances to enter the soil,and is an important factor to affect the security of farmland ecosystem. The atmospheric deposition of heavy metals in Jizhou District of northern Tianjin city has the following characteristics:( 1) Annual sediment flux of heavy metal elements from large to small in turn is Zn Pb Cr Cu Ni As Cd Hg,Pb and Zn are the most important elements in the dry and wet atmospheric deposition of heavy metals,the annual sedimentation flux of mountain area is less than that of plain,which indicates that the air environment quality of mountain area is better than that of plain area,compared with the Tianjin urban district,Beijing plain area and the whole country,the annual sediment flux of dry and wet atmospheric deposition of heavy metals in Jizhou district is relatively low;( 2) The Cd,Pb,Zn and Hg were significantly higher than the average value of the soil,especially the Cd,which indicated that the dry and wet atmospheric deposition may be an important source of Cd in soil;( 3) According to the results of dry and wet atmospheric deposition environmental geochemical evaluation,the results of single index and comprehensive index of dry and wet atmospheric deposition are all one,which indicates that the atmospheric environment quality is very good.
【Fund】: 中国地质调查局项目(12120113002000);; 天津市国土资源和房屋管理局项目(国土房任[2014]32号)
【CateGory Index】: X51;X823
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