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© 2018. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Aerosol-associated non-polar organic compounds (NPOCs), including 15 polycyclic aromatic hydrocarbons (PAHs), 30 n-alkanes, 2iso-alkanes, 5 hopanes and 5 steranes, were identified and quantified inPM2.5 samples using the thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) method. The samples were mainly collected in autumn and winter in a typical city of eastern China. The total concentrations of NPOCs were 31.7–388.7 ng m-3, and n-alkanes were the most abundant species (67.2 %). The heavy-molecular-weight PAHs (four- and five-ring) contributed 67.9 % of the total PAHs, and the middle-chain-lengthn-alkanes (C25C34) were the most abundant (72.3 %) in n-alkanes. PAHs and n-alkanes were mainly distributed in the 0.56–1.00 µm fraction, while (hopanes + steranes) were associated with the 0.32–1.00 µm fraction, suggesting condensation of combustion products was their important origin. The ratio–ratio plots indicated that NPOCs in the local area were affected by photochemical degradation. To reduce the uncertainty caused by only particle NPOC data for source apportionment, the particle and predicted gaseous-phase NPOCs, incorporated with otherPM2.5 compound were used as input data for the positive matrix factorization (PMF) model. Eight factors were extracted for both cases: secondary aerosol formation, vehicle exhaust, industrial emission, coal combustion, biomass burning, ship emission, and dust and light NPOCs. These findings highlight the emissions from different aerosol-associated NPOC origins, which caused different size-specific distributions, photodegradation and gas–particle partitioning, which further affectPM2.5 source apportionment. Considering these effects on organic tracers will help us accurately identify the potential sources of aerosols and then asses the contributions from each source.

Details

Title
Non-polar organic compounds in autumn and winter aerosols in a typical city of eastern China: size distribution and impact of gas–particle partitioning on PM2.5 source apportionment
Author
Han, Deming 1   VIAFID ORCID Logo  ; Fu, Qingyan 2 ; Gao, Song 2 ; Li, Li 3   VIAFID ORCID Logo  ; Ma, Yingge 3 ; Qiao, Liping 3 ; Xu, Hao 1 ; Liang, Shan 1 ; Cheng, Pengfei 4 ; Chen, Xiaojia 1 ; Zhou, Yong 1 ; Yu, Jian Zhen 5   VIAFID ORCID Logo  ; Cheng, Jinping 1 

 School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 
 Shanghai Environmental Monitor Centre, Shanghai 200235, China 
 State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Science, Shanghai 200233, China 
 School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang 332005, Jiangxi, China 
 Department of Chemistry, the Hong Kong University of Science and Technology, Hong Kong 999077, China 
Pages
9375-9391
Publication year
2018
Publication date
2018
Publisher
Copernicus GmbH
ISSN
16807316
e-ISSN
16807324
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2066622554
Copyright
© 2018. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.