演題概要

ポスター発表

第2日　5月18日（木）　　P会場（多目的ホール）

2P-41　　PDF

揮発性有機化合物の分子情報を用いたプロトン移動反応質量分析法の感度計算

(¹米国立海洋大気庁・ ²横市大院生命ナノ・ ³カナダ国環研・ ⁴環境科学研究所)
^o関本奏子^1,2・ Li, Shao-meng³・ Yuan, Bin^1,4・ Koss, Abigail^1,4・ Coggon, Matthew^1,4・ Warneke, Carsten^1,4・ de Gouw, Joost^1,4

Proton-transfer-reaction mass spectrometry (PTR-MS) allows the detection of a large number of trace gases in air through proton-transfer reaction with H₃O⁺ reagent ions. Measurement sensitivities can be experimentally determined using calibration gases or calculated using the rate constant for the proton-transfer reaction, but rate constants have only been measured for a subset of compounds. Here we show that capture collision rate constants for proton-transfer reactions of H₃O⁺ with various different volatile organic compounds (VOCs) can be obtained using the molecular mass, elemental composition, and functionality of VOCs. This methodology makes it possible to comprehensively and accurately calculate the sensitivities of atmospherically important VOCs measured by PTR-MS.