Dicarbonyl products of the OH radical-initiated reaction of a series of aromatic hydrocarbons

Janet Arey, Genevieve Obermeyer, Sara M. Aschmann, Sulekha Chattopadhyay, Roland D. Cusick, Roger Atkinson

Research output: Contribution to journalArticle

Abstract

Aromatic hydrocarbons are important constituents of vehicle exhaust and of nonmethane organic compounds in ambient urban air. We used a derivatization technique with methane positive chemical ionization gas chromatography/mass spectrometry to investigate the carbonyl products formed from the OH radical-initiated reactions of toluene, the xylenes, and the trimethyl-benzenes. Characteristic diderivatized molecularions of dicarbonyl products were obtained. Consistent with previous studies, the 1,2-dicarbonyls glyoxal, methylglyoxal, and biacetyl were observed, as were all but one of the possible unsaturated 1,4-dicarbonyl coproducts. Unsaturated 1,4-diketones had formation yields similar to their potential coproduct 1,2-dicarbonyls. However, apart from HC(O)CH=CHCHO, unsaturated 1,4-dialdehydes and keto-aldehydes were generally observed in lower yield than their potential 1,2-dicarbonyl coproducts.

Original languageEnglish (US)
Pages (from-to)683-689
Number of pages7
JournalEnvironmental Science and Technology
Volume43
Issue number3
DOIs
StatePublished - Feb 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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