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《Urban Environment & Urban Ecology》 2011-04
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Chemical Speciation of Heavy Metals and Health Risk Assessment in Dust of Qingdao Urban Parks

QIAN Yi,LIU Zheng-yan(College of Environment and Safety Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)  
The total amount of heavy metals and their distributions of chemical speciation were analysed in the dust samples from different parks of the four districts in Qingdao,including Shinan,Shibei,Sifang and Licang Districts,and the health risk of heavy metals in dust in these parks was evaluated.The result showed that soil and dust in the urban parks in Qingdao City were all polluted in different extents by four kinds of heavy metals: Cu,Zn,Pb and Cd.And the content of Cu in Licang District was in the top among the four districts,as well as Zn,Pb,and Cd.The content of Cu in the dust of the parks in Shinan District was the lowest,as well as Pb and Cd.The content of Zn in Shibei District was the lowest.Cu mainly existed as the organic phase,while Zn mainly existed as carbonates and Fe-Mn oxides,Pb Fe-Mn oxides,Cd Fe-Mn oxides and residual fraction.The order of non-cancer hazard indexes of these four heavy metals was Pb Cu Cd Zn.Their indexes were all lower than their threshold values,which involved no non-carcinogenic risk to the human health.And Cd involved no carcinogenic risk to humans.
【Fund】: 国家自然科学基金资助项目(40601062)
【CateGory Index】: X53
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