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Oxidation Of Substituted Catechols At The Air-Water Interface: Production Of Carboxylic Acids, Quinones, And Polyphenols, Elizabeth A. Pillar, Marcelo I. Guzman
Oxidation Of Substituted Catechols At The Air-Water Interface: Production Of Carboxylic Acids, Quinones, And Polyphenols, Elizabeth A. Pillar, Marcelo I. Guzman
Chemistry Faculty Publications
Anthropogenic activities contribute benzene, toluene, and anisole to the environment, which in the atmosphere are converted into the respective phenols, cresols, and methoxyphenols by fast gas-phase reaction with hydroxyl radicals (HO(•)). Further processing of the latter species by HO(•) decreases their vapor pressure as a second hydroxyl group is incorporated to accelerate their oxidative aging at interfaces and in aqueous particles. This work shows how catechol, pyrogallol, 3-methylcatechol, 4-methylcatechol, and 3-methoxycatechol (all proxies for oxygenated aromatics derived from benzene, toluene, and anisole) react at the air-water interface with increasing O3(g) during τc ≈ 1 μs contact time and contrasts their …
Heterogeneous Oxidation Of Catechol, Elizabeth A. Pillar, Ruixin Zhou, Marcelo I. Guzman
Heterogeneous Oxidation Of Catechol, Elizabeth A. Pillar, Ruixin Zhou, Marcelo I. Guzman
Chemistry Faculty Publications
Natural and anthropogenic emissions of aromatic hydrocarbons from biomass burning, agro-industrial settings, and fossil fuel combustion contribute precursors to secondary aerosol formation (SOA). How these compounds are processed under humid tropospheric conditions is the focus of current attention to understand their environmental fate. This work shows how catechol thin films, a model for oxygenated aromatic hydrocarbons present in biomass burning and combustion aerosols, undergo heterogeneous oxidation at the air–solid interface under variable relative humidity (RH = 0–90%). The maximum reactive uptake coefficient of O3(g) by catechol γO3 = (7.49 ± 0.35) × 10–6 occurs for …
Chemical Composition Of Air Masses Transported From Asia To The U.S. West Coast During Itct 2k2: Fossil Fuel Combustion Versus Biomass-Burning Signatures, J. A. De Gouw, O. R. Cooper, C. Warneke, P. K. Hudson, F. C. Fehsenfeld, J. S. Holloway, G. Hübler, Jr K. Nicks, J. B. Nowak, D. D. Parrish, T. B. Ryerson, E. L. Atlas, Stephen G. Donnelly Ph.D., S. M. Schauffler, V. Stroud, K. Johnson, G. R. Carmichael, D. G. Streets
Chemical Composition Of Air Masses Transported From Asia To The U.S. West Coast During Itct 2k2: Fossil Fuel Combustion Versus Biomass-Burning Signatures, J. A. De Gouw, O. R. Cooper, C. Warneke, P. K. Hudson, F. C. Fehsenfeld, J. S. Holloway, G. Hübler, Jr K. Nicks, J. B. Nowak, D. D. Parrish, T. B. Ryerson, E. L. Atlas, Stephen G. Donnelly Ph.D., S. M. Schauffler, V. Stroud, K. Johnson, G. R. Carmichael, D. G. Streets
Chemistry Faculty Publications
As part of the Intercontinental Transport and Chemical Transformation experiment in 2002 (ITCT 2K2), a National Oceanic and Atmospheric Administration (NOAA) WP-3D research aircraft was used to study the long-range transport of Asian air masses toward the west coast of North America. During research flights on 5 and 17 May, strong enhancements of carbon monoxide (CO) and other species were observed in air masses that had been transported from Asia. The hydrocarbon composition of the air masses indicated that the highest CO levels were related to fossil fuel use. During the flights on 5 and 17 May and other days, …