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《Research of Environmental Sciences》 2013-08
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Health Risk Assessment of Trace Elements of PM_(2.5) Exposure for the Elderly Subpopulation in Tianjin,China

WANG Zhao1,HAN Bin2,NI Tian-ru1,LI Peng-hui1,BAI Zhi-peng2 1.College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China 2.State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China  
To investigate exposure characteristics of PM2.5,a panel study was conducted for elderly subpopulation in Tianjin.Totally 101 elderly participants with mean age 67 were selected and their exposure to PM2.5 were monitored longitudinally in summer(13th June-2nd July) and winter(30th November-12th December) of 2011.Personal and indoor PM2.5 samples were collected by a personal environmental sampler.Ambient PM2.5 samples were obtained by a median-volume PM2.5 sampler.All samples were analyzed using inductively coupled plasma-mass spectroscopy(ICP-MS) for trace elements(V,Cr,Mn,Co,Ni,Cu,Zn,As,Cd and Pb).The results showed that the personal,indoor and ambient PM2.5concentrations were(124.2±75.2) μg/m3,(120.0±48.9) μg/m3,(98.6±33.3) μg/m3 for summer,and(170.8±126.6) μg/m3,(164.9±125.7) μg/m3,(140.0±87.7) μg/m3 for winter,respectively.The result of the concentration analysis for trace elements showed that Zn was the most abundant element,accounting for over 37% of the total trace element concentration in summer(324.18-345.65 ng/m3) and over 35% in winter(148.36-362.00 ng/m3).The hazards quotients(HQ) of 6 non-cancer-risk elements(V,Cr,Mn,Cu,Zn and Pb) were below 1.The HQ of Cr and Mn were higher than 0.1,which might have non-cancer-risk for the elderly subpopulation.The median value of Incremental Lifetime Cancer Risk(ILCR) of As was 1.12×10-5.The total ILCR and ILCRs of As and Cd were all higher than the acceptable risk level of 10-6,indicating an unacceptable potential cancer risk.
【Fund】: 国家重点基础研究发展计划(973)项目(2011CB503801);; 国家自然科学基金项目(20977054)
【CateGory Index】: X820.4
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