PM_(2.5) and PM_(10-2.5) chemical composition and source apportionment near a Hong Kong roadway

查看全文 作　　者：Yan [1,2,3]Cheng;Shuncheng [3]Lee;Zhaolin [1]Gu;Kinfai [4]Ho;Yunwei [1]Zhang;Yu [3]Huang;Judith [1,2,5]C.Chow;John [1,2,5]G.Watson;Junji [2]Cao;Renjian [6]Zhang

机构地区：[1]Department of Environmental Science and Technology,School of Human Settlements and Civil Engineering,Xi'an Jiaotong University;[2]State Key Laboratory of Loess Quaternary Geology,Institute of Earth and Environment,Chinese Academy of Sciences;[3]Department of Civil and Structural Engineering,Research Center for Environmental Technology and Management,The Hong Kong Polytechnic University;[4]School of Public Health and Primary Care,The Chinese University of Hong Kong;[5]Division of Atmospheric Sciences,Desert Research Institute;[6]Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Particuology》索引2015年第13卷第1期,共9页

基　　金：project was supported by Hong Kong Polytechnic University(G-YX3L,G-YF23);the Natural Science Foundation of China (NSFC-21107084);State Key Laboratory of Loess & Quaternary Geology(SKLLQG0804),Chinese Academy of Sciences 摘　　要：Twenty-four-hour PM_(2.5) and PM_(10) samples were collected simultaneously at a highly trafficked roadside site in Hong Kong every sixth day from October 2004 to September 2005.The mass concentrations of PM_(2.5),PM_(10-2.5)(defined as PM_(10)- PM_(2.5)),organic carbon(OC),elemental carbon(EC),water-soluble ions,and up to 25 elements were determined.Investigation of the chemical compositions and potential sources revealed distinct differences between PM_(2.5) and PM_(10-2.5).The annual average mass concentrations were 55.5±25.5 and 25.9±15.7 ug/m^3 for PM_(2.5) and PM_(10-2.5),respectively.EC,OM(OM =OC×1.4),and ammonium sulfate comprised over ~82% of PM_(2.5),accounting for^29%,~27%,and ~25%,respectively,of the PM_(2.5) mass.Low OC/EC ratios(less than 1) for PM_(2.5) suggested that fresh diesel-engine exhaust was a major contributor.Seven sources were resolved for PM_(2.5) by positive matrix factorization(PMF) model,including vehicle emissions(~29%),secondary inorganic aerosols(~27%),waste incinerator/biomass burning(~23%),residual oil combustion(~10%),marine aerosols(~6%),industrial exhaust(~4%),and resuspended road dust(~1%).EC and OM comprised only ~19%of PM_(10-2.5).The average OC/EC ratio of PM_(10-2.5) was 7.8±14.2,suggesting that sources other than vehicular exhaust were important contributors.The sources for PM_(10-2.5) determined by the PMF model included ~20%traffic-generated resuspension(e.g.,tire dust/brake linear/petrol evaporation),~17% locally resuspended road dust,~17% marine aerosols,~12% secondary aerosols/field burning,and ~11%vehicle emissions. 关键词：化学成分 PM2.5 来源解析香港汽车尾气排放组成巷道质量浓度

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PM_(2.5) and PM_(10-2.5) chemical composition and source apportionment near a Hong Kong roadway

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