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Poster Presentations
Day 2, June 11（Tue.） Room P1 (Multipurpose Hall)・Room P2 (Conference Room 101+102)
- 2P-40（1A-O1-1430）
High Accuracy Analysis of Functional Groups of α-Pinene Oxidation Products Using Positive-/Negative-Ion Collision-Induced Dissociation Mass Spectrometry (CID-MS) and Derivatization Reactions
(Yokohama City Univ.)
oDaisuke Fukuyama, Kanako Sekimoto
α-Pinene (C10H16) are oxidized by ozone (O3), hydroxyl radicals, and NO3 radicals in the atmosphere. They can be converted to highly oxidized multifunctional organic compounds, which are significantly involved in secondary organic aerosol (SOA) formation. It is important for atmospheric chemistry to identify and quantify functional group of oxidation products of α-pinene. However, the structures of all oxidation products are still not understood. In this study, we investigated functional groups of the oxidation products of α-pinene by using a combined positive-/negative-ion atmospheric pressure corona discharge ionization (APCDI) without chromatography and collision-induced dissociation (CID) methods. We report neutral species dissociated by CID are related to the type of functional group and the protonation/deprotonation position. We identified functional groups of the actual oxidation products of α-pinene using this relationship. These results were confirmed by positive-ion ESI-CID-MS using derivatization reactions (oximation of carbonyls by O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine, methyl esterification of carboxylic acids by trimethylsilyl diazomethane, and acylation of alcohols by acetic anhydride).