Effects of particle acidity and UV light on secondary organic aerosol formation from oxidation of aromatics in the absence of NOx |
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| Institution: | 1. Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry and Environment, Minnan Normal University, Zhangzhou 363000, China;2. Department of Applied Physics, University of Eastern Finland, Kuopio 70211, Finland;3. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;1. Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA, 92521, USA;2. Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), Riverside, CA, 92507, USA;3. Department of Chemical and Biomolecular Engineering, A. James Clark School of Engineering, University of Maryland, College Park, MD, 20742, USA;1. Universidad de Castilla-La Mancha, Facultad de Ciencias y Tecnologías Químicas, Avenida Camilo José Cela s/n, 13071, Ciudad Real, Spain;2. Universidad de Castilla-La Mancha, Instituto de Investigación en Combustión y Contaminación Atmosférica, Camino Moledores, s/n, 13071, Ciudad Real, Spain;3. Universidad de Castilla-La Mancha, Facultad de Ciencias Ambientales y Bioquímica, Avenida Carlos III s/n, 45071, Toledo, Spain |
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| Abstract: | Recent laboratory observations have shown that particle acidity increases secondary organic aerosol (SOA) yields. However, these studies have mainly focused on biogenic precursors such as isoprene and terpenes. In this paper, the effects of particle acidity on the SOA yields from aromatic precursors under both dark and UV–visible light conditions were characterized through controlled chamber experiments. SOA was produced from oxidation of toluene and 1,3,5-trimethylbenzene (135-TMB) with OH radicals created by ozonolysis of 2-methyl-2-butene (MB). Particle acidity, described with proton concentrations, varied with inorganic seed aerosol composition and humidity (20–52%). Overall, in the presence of acidic seeds, greater increases in SOA yields were observed for the toluene system than the 135-TMB system. UV irradiation reduced SOA yields for both toluene and 135-TMB systems to different extents. |
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