ポスター発表
- 第1日 6月22日（水） P会場（501，502，503）
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1P-31 PDF
α-pinene酸化体のプロトン付加分子のフラグメンテーション機構
α-Pinene, one of volatile organic compounds (VOCs), is the most abundant monoterpenes emitted from forests. α-Pinene forms secondary organic aerosols (SOAs) by undergoing oxidation reaction in the atmosphere. Potential of SOA formation depends on the property of the functional groups including in monoterpene oxidation products. However, few of structures of the oxidation products have been identified, and therefore the process of these formation has not yet been solved. In this study, α-pinene oxidation products, i.e., pinonic acid, pinolic acid and pinic acid, were measured by an atmospheric pressure corona discharge ionization mass spectrometry (APCDI-MS) and collision-induced dissociation (CID). Sequential loss of H2O + H2O + CO and H2O + H2O + C2H2O was observed for CID of protonated molecules of all samples, while H2O + CO + H2O and H2O + C2H2O + H2O were only observed for pinonic acid. Specific loss of H2CO3 + H2O and HCOOH + H2O was observed for pinic acid. These differences in fragmentation pathway were most likely attributed to presence or absence of intra-molecular hydrogen bonds in the samples.