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• W2427702933 endingPage "8800" @default.
• W2427702933 startingPage "8794" @default.
• W2427702933 abstract "Hydroxyl radical (OH) uptake by organic aerosols, followed by heterogeneous oxidation, happens nearly at the collision frequency. Oxidation complicates the use of organic molecular markers such as hopanes for source apportionment, since receptor models assume markers are stable during transport. We report the oxidation kinetics of organic molecular markers (C25−C32 n-alkanes, hopanes and steranes) in motor oil and primary organic aerosol emitted from a diesel engine at atmospherically relevant conditions inside a smog chamber. A thermal desorption aerosol gas chromatograph/mass spectrometer (TAG) and Aerodyne high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) were used to measure the changes in molecular comosition and bulk primary organic aerosol. From the measured changes in molecular composition, we calculated effective OH rate constants, effective relative rate constants, and effective uptake coefficients for molecular markers. Oxidation rates varied with marker volatility, with more volatile markers being oxidized at rates much faster than could be explained from heterogeneous oxidation. This rapid oxidation can be explained by significant gas-phase OH oxidation that dominates heterogeneous oxidation, resulting in overall oxidation lifetimes of 1 day or less. Based on our results, neglecting oxidation of molecular markers used for source apportionment could introduce significant error, since many common markers such as norhopane appear to be semivolatile under atmospheric conditions." @default.
• W2427702933 created "2016-06-24" @default.
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• W2427702933 date "2009-10-26" @default.
• W2427702933 modified "2023-10-01" @default.
• W2427702933 title "Effective Rate Constants and Uptake Coefficients for the Reactions of Organic Molecular Markers (<i>n</i>-Alkanes, Hopanes, and Steranes) in Motor Oil and Diesel Primary Organic Aerosols with Hydroxyl Radicals" @default.
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• W2427702933 doi "https://doi.org/10.1021/es901745h" @default.
• W2427702933 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19943648" @default.
• W2427702933 hasPublicationYear "2009" @default.
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