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Environ Sci Technol

Title:		Effects of precursor concentration and acidic sulfate in aqueous glyoxal-OH radical oxidation and implications for secondary organic aerosol
Author(s):		Tan Y; Perri MJ; Seitzinger SP; Turpin BJ;
Address:		"Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA"
Journal Title:		Environ Sci Technol
Year:		2009
Volume:		43
Issue:		21
Page Number:		8105 - 8112
DOI:		10.1021/es901742f
ISSN/ISBN:		0013-936X (Print) 1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Previous experiments demonstrated that aqueous OH radical oxidation of glyoxal yields low-volatility compounds. When this chemistry takes place in clouds and fogs, followed by droplet evaporation (or if it occurs in aerosol water), the products are expected to remain partially in the particle phase, forming secondary organic aerosol (SOA). Acidic sulfate exists ubiquitously in atmospheric water and has been shown to enhance SOA formation through aerosol phase reactions. In this work, we investigate how starting concentrations of glyoxal (30-3000 microM) and the presence of acidic sulfate (0-840 microM) affect product formation in the aqueous reaction between glyoxal and OH radical. The oxalic acid yield decreased with increasing precursor concentrations, and the presence of sulfuric acid did not alter oxalic acid concentrations significantly. A dilute aqueous chemistry model successfully reproduced oxalic acid concentrations, when the experiment was performed at cloud-relevant concentrations (glyoxal <300 microM), but predictions deviated from measurements at increasing concentrations. Results elucidate similarities and differences in aqueous glyoxal chemistry in clouds and in wet aerosols. They validate for the first time the accuracy of model predictions at cloud-relevant concentrations. These results suggest that cloud processing of glyoxal could be an important source of SOA"
Keywords:		"Aerosols/*analysis Carbon/analysis Carboxylic Acids/chemistry Glyoxal/*chemistry Hydroxyl Radical/*chemistry Kinetics Oxidation-Reduction Spectrometry, Mass, Electrospray Ionization Sulfates/*chemistry Sulfuric Acids/*chemistry Time Factors Water/*chemist;"
Notes:		"MedlineTan, Yi Perri, Mark J Seitzinger, Sybil P Turpin, Barbara J eng Research Support, U.S. Gov't, Non-P.H.S. 2009/11/21 Environ Sci Technol. 2009 Nov 1; 43(21):8105-12. doi: 10.1021/es901742f"