Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-20723-2008 http://www.atmos-chem-phys-discuss.net/8/20723/2008/ http://www.atmos-chem-phys-discuss.net/8/20723/2008/acpd-8-20723-2008.html http://www.atmos-chem-phys-discuss.net/8/20723/2008/acpd-8-20723-2008.pdf 20723 20748 2008-12-11 The potential contribution of organic salts to new particle growth K. C. Barsanti barsanti@ucar.edu P. H. McMurry J. N. Smith Atmospheric Chemistry Division, National Center for Atmospheric Research,\newline Boulder, CO, USA Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA Field and lab measurements suggest that low-molecular weight (MW) organic acids and bases exist in accumulation and nucleation mode particles, despite their relatively high pure-liquid vapor pressures. The mechanism(s) by which such compounds contribute to the mass growth of existing aerosol particles and newly formed particles has not been thoroughly explored. One mechanism by which low-MW compounds may contribute to new particle growth is through the formation of organic salts. In this paper we use thermodynamic modeling to explore the potential for organic salt formation by atmospherically relevant organic acids and bases for two system types: one in which the relative contribution of ammonia vs. amines in forming organic salts was evaluated, the other in which the decrease in volatility of organic acids and bases due to organic salt formation was assessed. The modeling approach employed relied heavily on group contribution and other estimation methods for necessary physical and chemical parameters. 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