IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
PM2.5 and PM10-2.5 chemical composition and source apportionmentnear a Hong Kong roadway
Cheng,Y(Cheng,Yan)[1,2,3]; Lee,SC(Lee,Shuncheng)[3]; Gu,ZL(Gu,Zhaolin)[1]; Ho,KF(Ho,Kinfai)[4]; Zhang,YW(Zhang,Yunwei)[1]; Huang,Y(Huang,Yu)[3]; Chow,JC(Chow,Judith C.)[1,2,5]; Watson,JG(Watson,John G.)[1,2,5]; Cao,JJ(Cao,Junji)[2]; Zhang,RJ(Zhang,Renjian)[6]
Source PublicationParticuology
AbstractTwenty-four-hour PM2.5 and PM10 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 PM2.5, PM10-2.5 (defined as PM10 − PM2.5), 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 PM2.5 and PM10-2.5. The annual average mass concentrations were 55.5 ± 25.5 and 25.9 ± 15.7 g/m3 for PM2.5 and PM10-2.5, respectively. EC, OM (OM = OC × 1.4), and ammonium sulfate comprised over ∼82% of PM2.5, accounting for ∼29%, ∼27%, and ∼25%, respectively, of the PM2.5 mass. Low OC/EC ratios (less than 1) for PM2.5 suggested that fresh diesel-engine exhaust was a major contributor. Seven sources were resolved for PM2.5 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 PM10-2.5. The average OC/EC ratio of PM10-2.5 was 7.8 ± 14.2, suggesting that sources other than vehicular exhaust were important contributors. The sources for PM10-2.5 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.
KeywordPM2.5 PM10-2.5 Roadside Chemical composition Source apportionment Hong Kong
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Affiliation1.Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2.State Key Laboratory of Loess Quaternary Geology, Institute of Earth and Environment, Chinese Academy of Sciences, Xi’an 710075, China;
3.Department of Civil and Structural Engineering, Research Center for Environmental Technology and Management, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;
4.School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China;
5.Division of Atmospheric Sciences, Desert Research Institute, NV 89512-1095, USA;
6.Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Recommended Citation
GB/T 7714
Cheng,Y,Lee,SC,Gu,ZL,et al. PM2.5 and PM10-2.5 chemical composition and source apportionmentnear a Hong Kong roadway[J]. Particuology,2015,18(2015):96-104.
APA Cheng,Y.,Lee,SC.,Gu,ZL.,Ho,KF.,Zhang,YW.,...&Zhang,RJ.(2015).PM2.5 and PM10-2.5 chemical composition and source apportionmentnear a Hong Kong roadway.Particuology,18(2015),96-104.
MLA Cheng,Y,et al."PM2.5 and PM10-2.5 chemical composition and source apportionmentnear a Hong Kong roadway".Particuology 18.2015(2015):96-104.
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