Photo-oxidation of low-volatility organics found in motor vehicle emissions: production and chemical evolution of organic aerosol mass

Environmental Science & Technology
Marissa A MiracoloAllen L Robinson

Abstract

Recent research has proposed that low-volatility organic vapors are an important class of secondary organic aerosol (SOA) precursors. Mixtures of low-volatility organics were photo-oxidized in a smog chamber under low- and high-NO(x) conditions. Separate experiments addressed emission surrogates (diesel fuel and motor oil) and single components (n-pentacosane). Both diesel fuel and motor oil are major components of exhaust from diesel engines. Diesel fuel is a complex mixture of intermediate volatility organic compounds (IVOCs), whereas motor oil is a complex mixture of semivolatile organic compounds (SVOCs). IVOCs exist exclusively in the vapor phase, while SVOCs exist in both the aerosol and vapor phase. Oxidation of SVOC vapors (motor oil and n-pentacosane) creates substantial SOA, but this SOA is largely offset by evaporation of primary organic aerosol (POA). The net effect is a cycling or pumping of SVOCs between the gas and particle phases, which creates more oxygenated organic aerosol (OA) but little new OA mass. Since gas-phase reactions are much faster than heterogeneous ones, the processing of SVOC vapors likely contributes to the production of highly oxidized OA. The interplay between gas-particle partitioning and ch...Continue Reading

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Citations

Jun 27, 2012·Environmental Science & Technology·Marissa A MiracoloAllen L Robinson
Sep 6, 2012·Environmental Science & Technology·Gabriel IsaacmanAllen H Goldstein
Dec 5, 2015·Critical Reviews in Toxicology·Annette Rohr, Jacob McDonald
Aug 30, 2014·Critical Reviews in Environmental Science and Technology·David A Morgott
Dec 22, 2016·Environmental Science & Technology·Drew R GentnerAllen L Robinson
Apr 20, 2016·Faraday Discussions·Ellis Shipley RobinsonEric Lipsky
Dec 28, 2017·Proceedings of the National Academy of Sciences of the United States of America·D A RidleyJ H Kroll
Apr 21, 2021·Faraday Discussions·John G WatsonJudith C Chow
Mar 24, 2012·The Journal of Physical Chemistry. a·Kaytlin M Henry, Neil M Donahue

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