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Potentially Important Contribution of Gas-Phase Oxidation of Naphthalene and Methylnaphthalene to Secondary Organic Aerosol during Haze Events in Beijing
journal contribution
posted on 2019-01-09, 00:00 authored by Guancong Huang, Ying Liu, Min Shao, Yue Li, Qi Chen, Yan Zheng, Zhijun Wu, Yuechen Liu, Yusheng Wu, Min Hu, Xin Li, Sihua Lu, Chenjing Wang, Junyi Liu, Mei Zheng, Tong ZhuNaphthalene
(Nap) and methylnaphthalene (MN) are the most abundant
polycyclic aromatic hydrocarbons (PAHs) in atmosphere and have been
proposed to be important precursors of anthropogenic secondary organic
aerosol (SOA) derived from laboratory chamber experiments. In this
study, atmospheric Nap/MN and their gas-phase photooxidation products
were quantified by a Proton Transfer Reaction-Quadrupole interface
Time-of-Flight Mass Spectrometer (PTR-QiTOF) during the 2016 winter
in Beijing. Phthalic anhydride, a late generation product from Nap
under high-NOx conditions, appeared to
be more prominent than 2-formylcinnamaldehyde (early generation product),
possibly due to more sufficient oxidation during the haze. 1,2-Phthalic
acid (1,2-PhA), the hydrated form of phthalic anhydride, was capable
of partitioning into aerosol phase and served as a tracer to explore
the contribution of Nap to ambient SOA. The measured fraction in particle
phase (Fp) of 1,2-PhA averaged at 73 ±
13% with OA mass loadings of 52.5–87.8 μg/m3, lower than the value predicted by the absorptive partitioning model
(100%). Using tracer product-based and precursor consumption-based
methods, 2-ring PAHs (Nap and MN) were estimated to produce 14.9%
(an upper limit) of the SOA formed in the afternoon during the wintertime
haze, suggesting a comparable contribution of Nap and MN with
monocyclic-aromatics on urban SOA formation.
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Keywords
Important ContributionPhthalic anhydrideF pBeijing NaphthaleneMNGas-Phase Oxidationparticle phasecontribution of Napgeneration productgas-phase photooxidation productsaerosol phaseprecursor consumption-based methods2- ring PAHsOA mass loadingsSOA formationSecondary Organic Aerosoltracer product-basedphthalic anhydride2016 winterProton Transfer Reaction-Quadrupole interface Time-of-Flight Mass Spectrometerhigh-NO x conditionslaboratory chamber experimentsambient SOAHaze Events2- formylcinnamaldehydewintertime haze
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