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• W3013824857 abstract "Oxalic acid and sulfate salts are major components of aerosol particles. Here, we explore the potential for their respective precursor species, glyoxal and SO2, to form atmospheric brown carbon via aqueous-phase reactions in a series of bulk aqueous and flow chamber aerosol experiments. In bulk aqueous solutions, UV- and visible-light-absorbing products are observed at pH 3-4 and 5-6, respectively, with small but detectable yields of hydroxyquinone and polyketone products formed, especially at pH 6. Hydroxymethanesulfonate (HMS), C2, and C3 sulfonates are major products detected by electrospray ionization mass spectrometry (ESI-MS) at pH 5. Past studies have assumed that the reaction of formaldehyde and sulfite was the only atmospheric source of HMS. In flow chamber experiments involving sulfite aerosol and gas-phase glyoxal with only 1 min residence times, significant aerosol growth is observed. Rapid brown carbon formation is seen with aqueous aerosol particles at >80% relative humidity (RH). Brown carbon formation slows at 50-60% RH and when the aerosol particles are acidified with sulfuric acid but stops entirely only under dry conditions. This chemistry may therefore contribute to brown carbon production in cloud-processed pollution plumes as oxidizing volatile organic compounds (VOCs) interact with SO2 and water." @default.
• W3013824857 created "2020-04-03" @default.
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• W3013824857 date "2020-03-31" @default.
• W3013824857 modified "2023-10-15" @default.
• W3013824857 title "Brown Carbon Production by Aqueous-Phase Interactions of Glyoxal and SO₂" @default.
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• W3013824857 doi "https://doi.org/10.1021/acs.est.9b07852" @default.
• W3013824857 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32227881" @default.
• W3013824857 hasPublicationYear "2020" @default.
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