Aqueous reactions of small, water soluble aldehydes with amines or ammonium salts have been shown to be important for atmospheric brown carbon formation processes. The extent to which photolysis of these brown carbon compounds changes the chemical composition and light absorption of these systems is not well understood or characterized. We photolyze aged reaction systems of aqueous carbonyls (e.g., glycolaldehyde, glyoxal, methylglyoxal, and hydroxyacetone) and ammonium sulfate and monitor light absorption and chemical composition via UV-visible spectroscopy and mass spectrometry. Photobleaching and photobrowning varies with wavelength and aldehyde identity, while mass spectrometry shows that the chemical composition changes significantly upon photolysis.<br/>

Photolysis of aqueous atmospheric aerosol mimics

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.