Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35752
Title: Source apportionment of atmospheric PAHs and their toxicity using PMF: Impact of gas/particle partitioning
Authors: Gao, B
Wang, XM
Zhao, XY
Ding, X
Fu, XX
Zhang, YL
He, QF
Zhang, Z
Liu, TY
Huang, ZZ
Chen, LG
Peng, Y
Guo, H 
Keywords: PAHs
PM2.5
Source apportionment
Toxicity
Partitioning
Issue Date: 2015
Publisher: Pergamon Press
Source: Atmospheric environment, 2015, v. 103, p. 114-120 How to cite?
Journal: Atmospheric environment 
Abstract: 24-h PM2.5 samples were simultaneously collected at six sites in a subtropical city of South China during November December, 2009. Particle-phase concentrations of polycyclic aromatic hydrocarbons (PAHs) and organic tracers such as hopanes for vehicular emissions (VE), levoglucosan for biomass burning (BB) and picene for coal combustion (CC) were determined. Meanwhile, their gas-phase concentrations were calculated from gas/particle (G/P) partitioning theory using the particle-phase concentrations. The 4 ring PAHs (fluoranthene to chrysene) had lower particle-phase fractions (10%-79%) than other species. Estimated BaPeq and lifetime cancer risk for particle-only (P-only) vs gas + particle (G + P) data sets showed similar values, indicating PAHs with 5-7 rings dominated the carcinogenicity of PAHs. Positive Matrix Factorization (PMF) was applied on both P-only and G + P data sets to estimate the source contributions to PAHs and their toxicity. Three common sources were identified: VE, BB and CC, with CC as the most significant source for both particulate (58%) and total (G + P, 40%) PAHs. While CC exhibited consistent contributions to BaPeq for P-only (66%) vs G + P (62%) solutions, VE and BB contributions were under- and overestimated by 68% and 47%, respectively by the P-only solution, as compared to the G + P solution. The results provide an insight on the impact of G/P partitioning on the source apportionment of PAHs and their toxicity.
URI: http://hdl.handle.net/10397/35752
ISSN: 1352-2310
DOI: 10.1016/j.atmosenv.2014.12.006
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