Products of the gas-phase reactions of o-, m- and p-xylene with the OH radical in the presence and absence of NO_x

Abstract

The products of the gas-phase reactions of the OH radical with o-, m- and p-xylene, in the presence and absence of NO_x, have been investigated using direct air sampling, atmospheric-pressure ionisation tandem mass spectrometry (API–MS). Partially and fully deuteriated xylenes were also studied. In addition to ion peaks due to tolualdehydes and dimethylphenols, ion peaks observed from the xylene, [²H₆]xylene and [²H₁₀]xylene reactions are attributed to the [M+H]⁺ ions of the C₄-unsaturated dicarbonyl HC(O)CH=CHCHO, C₅-unsaturated dicarbonyls such as CH₃C(O)CH=CHCHO and its isomers, C₆-unsaturated dicarbonyls such as CH₃C(O)CH=CHC(O)CH₃ and its isomers, C₈-di-unsaturated dicarbonyls such as CH₃C(O)C(CH₃)=CHCH=CHCHO and its isomers, C₈-unsaturated epoxy-dicarbonyls and, possibly, C₈-epoxy-cyclohexenones, and their partially and fully deuteriated analogues. Possible reaction mechanisms leading to the observed products are presented.

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