Lim, Yong Bin Kim, Hwajin Kim, Jin Young Turpin, Barbara J. 2024-01-20T03:03:53Z 2024-01-20T03:03:53Z 2021-09-05 2016-10-11 1680-7316 https://pubs.kist.re.kr/handle/201004/123568 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. English COPERNICUS GESELLSCHAFT MBH SECONDARY ORGANIC AEROSOL OH RADICAL OXIDATION GAS-PHASE REACTIONS ATMOSPHERIC CHEMISTRY AQUEOUS-PHASE REACTIVE UPTAKE ORGANOSULFATE FORMATION MASS-SPECTROMETRY CHLORIDE ADDUCTS CLOUD-WATER Photochemical organonitrate formation in wet aerosols Article 10.5194/acp-16-12631-2016 1 ATMOSPHERIC CHEMISTRY AND PHYSICS, v.16, no.19, pp.12631 - 12647 ATMOSPHERIC CHEMISTRY AND PHYSICS 16 19 12631 12647 scie scopus 000385403100002 2-s2.0-84991607860 Environmental Sciences Meteorology & Atmospheric Sciences Environmental Sciences & Ecology Meteorology & Atmospheric Sciences Article SECONDARY ORGANIC AEROSOL OH RADICAL OXIDATION GAS-PHASE REACTIONS ATMOSPHERIC CHEMISTRY AQUEOUS-PHASE REACTIVE UPTAKE ORGANOSULFATE FORMATION MASS-SPECTROMETRY CHLORIDE ADDUCTS CLOUD-WATER