Formation of Polyketones in Irradiated Toluene/Propylene/NO x /Air Mixtures

A laboratory study was carried out to investigate the formation of polyketones in secondary organic aerosol from photooxidation of the aromatic hydrocarbon toluene, a major constituent of automobile exhaust. The laboratory experiments consisted of irradiating toluene/propylene/NO x /air mixtures in...

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Bibliographic Details
Published in:Aerosol science and technology 2001-01, Vol.35 (6), p.998-1008
Main Authors: Edney, E.O., Driscoll, D. J., Weathers, W. S., Kleindienst, T. E., Conver, T. S., McIver, C. D., Li, W.
Format: Article
Language:English
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Summary:A laboratory study was carried out to investigate the formation of polyketones in secondary organic aerosol from photooxidation of the aromatic hydrocarbon toluene, a major constituent of automobile exhaust. The laboratory experiments consisted of irradiating toluene/propylene/NO x /air mixtures in a smog chamber operated in the dynamic mode and collecting submicron secondary organic aerosol samples on Zefluor filters and on stainless steel disks in a low pressure cascade impactor. Carbonyl oxidation products in methanol extracts of the filters were derivatized using O-(2,3,4,5,6,-pentafluorobenzyl)-hydroxylamine, and the oxime derivatives were detected with a positive chemical ionization gas chromatography ion trap mass spectroscopy (GC-ITMS) system. Infrared spectra of the cascade impactor samples were used to determine the chemical functional group concentrations of the aerosol. The results of the GC-ITMS and infrared spectral analyses were consistent with the formation of multifunctional oxygenates, including hydroxy diones as well as triones, tetraones, and pentaones.
ISSN:0278-6826
1521-7388
DOI:10.1080/027868201753306769