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Photochemical organonitrate formation in wet aerosols

Cited 22 time in Web of Science Cited 23 time in Scopus
Authors

Lim, Yong Bin; Kim, Hwajin; Kim, Jin Young; Turpin, Barbara J.

Issue Date
2016-10
Publisher
COPERNICUS GESELLSCHAFT MBH
Citation
ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol.16 No.19, pp.12631-12647
Abstract
Water is the most abundant component of atmospheric fine aerosol. However, despite rapid progress, multiphase chemistry involving wet aerosols is still poorly understood. In this work, we report results from smog chamber photooxidation of glyoxal-and OH-containing ammonium sulfate or sulfuric acid particles in the presence of NOx and O-3 at high and low relative humidity. Particles were analyzed using ultra-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS). During the 3 h irradiation, OH oxidation products of glyoxal that are also produced in dilute aqueous solutions (e.g., oxalic acids and tartaric acids) were formed in both ammonium sulfate (AS) aerosols and sulfuric acid (SA) aerosols. However, the major products were organonitrogens (CHNO), organosulfates (CHOS), and organonitrogen sulfates (CHNOS). These were also the dominant products formed in the dark chamber, indicating non-radical formation. In the humid chamber (>70% relative humidity, RH), two main products for both AS and SA aerosols were organonitrates, which appeared at m/z(-) 147 and 226. They were formed in the aqueous phase via non-radical reactions of glyoxal and nitric acid, and their formation was enhanced by photochemistry because of the photochemical formation of nitric acid via reactions of peroxy radicals, NOx and OH during the irradiation.
ISSN
1680-7316
URI
https://hdl.handle.net/10371/203187
DOI
https://doi.org/10.5194/acp-16-12631-2016
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  • Graduate School of Public Health
  • Department of Environmental Health Sciences
Research Area Aerosol Health Effect, Atmospheric chemistry monitoring and modeling, Chemistry and life cycles of aerosol, 대기화학 모니터링 및 모델링, 대기환경 오염원 및 특성 규명

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