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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-908
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
08 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Non-polar organic compounds in aerosols in a typical city of Eastern China: Size distribution, gas-particle partitioning and tracer for PM2.5 source apportionment
Deming Han1, Qingyan Fu2, Song Gao2, Hao Xu1, Shan Liang1, Pengfei Cheng3, Xiaojia Chen1, Yong Zhou1, and Jinping Cheng1 1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2Shanghai Environmental Monitor Center, Shanghai 200235, China
3School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang 332005, Jiangxi, China
Abstract. Aerosol-associated non-polar organic compounds (NPOCs), including 15 polycyclic aromatic hydrocarbons (PAHs), 30 n–alkanes, 2 iso–alkanes, 5 hopanes and 5 steranes, were identified and quantified in PM2.5 samples using thermal desorption–gas chromatography/mass spectrometry (TD-GC/MS) method. The samples were collected in a typical city of Eastern China. The total concentrations of NPOCs were 31.7–388.7&thinsdp;ng m−3, and n–alkanes were the most abundant species (67.2 %). The heavy molecular weight PAHs (4- and 5-ring) contributed 67.88 % of the total PAHs, and the middle chain length n–alkanes (C25–C34) were the most abundant in n-alkanes. PAHs and n-alkanes were majorly distributed in 0.56–1.00 μm fraction. ∑(hopanes+steranes) were associated with the 0.32–1.00 μm fraction. Analysis showed that 83.0 % of NPOCs were originated from anthropogenic sources, especially pyrogenic sources such as fossil fuel combustion and biomass burning. The ratio–ratio plots indicated that NPOCs in local area were affected by photochemical degradation and emissions from mixed sources. Gas-particle partitioning model showed that the particle-phase fraction (φ) of light molecular weight NPOCs ranged from 2.4 % to 62.5 %, while that of heavy NPOCs accounted for more than 90.0 %. The data based on single particle phase and the data based on gas-particles phases incorporated with other PM2.5 compounds were used as input data for positive matrix factorization (PMF) model, respectively. Eight factors were extracted for both cases: secondary aerosol formation, vehicle exhaust, industrial emission, coal combustion, biomass burning, ship emission, dust and light NPOCs. This study provides new information on the profiles of PM2.5-associated NPOCs, size-specific distributions, photodegradation and their gas-particle partitioning. This will help us accurately identify the potential sources of aerosols and then asses the contributions from each source.

Citation: Han, D., Fu, Q., Gao, S., Xu, H., Liang, S., Cheng, P., Chen, X., Zhou, Y., and Cheng, J.: Non-polar organic compounds in aerosols in a typical city of Eastern China: Size distribution, gas-particle partitioning and tracer for PM2.5 source apportionment, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-908, in review, 2018.
Deming Han et al.
Deming Han et al.

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Short summary
Non-polar organic compounds (NPOCs) as one important class of particle constituents, served as good tracers for PM2.5 source apportionment. This research firstly systemically analyzed the characterization of size-specific aerosols-associated NPOCs, evaluated their gas-particle phase partitioning among different size aerosols, and assessed the impacts of partitioning and photodegradation to the aerosol source identifications, whihc will help us to identify more accurate sources of particles.
Non-polar organic compounds (NPOCs) as one important class of particle constituents, served as...
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