Determination of Secondary Organic Aerosol Products from the Photooxidation of Toluene and Their Implications in Ambient PM sub(2.5)

Smog chamber experiments were carried out in which toluene/nitrogen oxides mixtures were irradiated, and the resulting aerosol mixture was drawn through a denuder filter combination so that the gas and particle phases could be determined. The smog chamber was operated as a continuous stirred reactor...

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Bibliographic Details
Published in:Journal of atmospheric chemistry 2004-01, Vol.47 (1), p.79-79
Main Authors: Kleindienst, TE, Conver, T S, McIver, C D, Edney, E O
Format: Article
Language:English
Online Access:Get full text
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Summary:Smog chamber experiments were carried out in which toluene/nitrogen oxides mixtures were irradiated, and the resulting aerosol mixture was drawn through a denuder filter combination so that the gas and particle phases could be determined. The smog chamber was operated as a continuous stirred reactor with a residence time of 4 h. Chemical analysis was performed via gas chromatography ion trap mass spectroscopy. Results revealed the presence of carbonyl oxidation products, including polyketones, hydroxy ketones, keto acids, and hydroxy keto acids. The highly oxidized compounds produced suggested the types of compounds that could serve as indicator compounds in ambient PM sub(2.5) to establish the contribution of toluene secondary organic aerosol products to the organic fraction. Two compounds, 2,3-dihydroxy-4-oxobutanoic acid and 2,3-dihydroxy-4-oxopentanoic acid, were identified as candidate marker compounds.
ISSN:0167-7764
DOI:10.1023/B:JOCH.0000012305.94498.28