HPLC–MS determination of the oxidation products of the reaction between α- and β-pinene and OH radicals
2002
Bergh, V. van den | Coeckelberghs, H. | Vanhees, I. | Boer, R. de | Compernolle, F. | Vinckier, C.
Biogenic non-methane hydrocarbons such as isoprene, α-pinene, and β-pinene, are emitted by forests in very large quantities. To evaluate the role of α- and β-pinene and their contribution to the global production of trace gases and especially aerosol precursors, a study of the oxidation mechanism of α- and β-pinene with hydroxyl radicals must be conducted.The degradation products of both monoterpenes with hydroxyl radicals were identified and quantified in a fast-flow reactor. The products were collected on a liquid-nitrogen trap coated with a 2,4-DNPH solution to which two internal standards (benzaldehyde-2,4-DNPH and tolualdehyde-2,4-DNPH) had been added. The collection method was based on the in situ conversion of aldehyde and/or ketone compounds to their 2,4–dinitrophenylhydrazone derivatives. The derivatives were analyzed by HPLC–MS using APCI(–). TIC chromatograms and mass spectral data for the various oxidation products are presented.For α-pinene, pinonaldehyde is the most important degradation product, with smaller amounts of acetone, formaldehyde, campholenealdehyde, and acetaldehyde. For β-pinene, nopinone and formaldehyde are the most abundant products, of almost equal importance, whereas acetone and acetaldehyde are minor compounds.
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