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Determining Proton-Transfer Reaction Rate Constants for Volatile Organic Compounds using the Protonated Acetone Reagent

机译:使用质子化丙酮试剂测定挥发性有机化合物的质子转移反应速率常数

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Reaction rate constants for the protonation of volatile organic compounds (VOCs) by the hydronium ion reagent have been measured previously using proton-transfer reaction mass spectrometry (PTR-MS) and selected-ion flow tube (SIFT) MS. The protonation of VOCs depends on the proton affinity of the VOC as compared to the ionizing reagent (e.g. water, PA 691.0 kJ/mol). when the proton affinity of the VOC is greater than that of the reagent, the reaction is exergonic and protonation can occur. In this work, quadrupole ion trap mass spectrometry (QITMS) is used to measure VOC proton-transfer rate constants using two ionizing reagents, the hydronium ion reagent and protonated acetone reagent. The ability to control ion-molecule reaction times in the QITMS makes this an attractive approach for quantitatively measuring VOC reaction rate constants. The goal of this work is to determine the reaction rate constants in the QITMS so that these reactions can be used to quantify VOCs.
机译:通过先前使用质子 - 转移反应质谱(PTR-MS)和选择离子流量管(SIFT)MS,通过先前测量瓦辛基离子试剂的挥发性有机化合物(VOC)质量的反应速率常数。与电离试剂相比,VOC的质子化取决于VOC的质子亲和力(例如水,PA 691.0 kJ / mol)。当VOC的质子亲和力大于试剂的亲和力时,反应是出现的Exergony和质子化。在这项工作中,使用两个电离试剂,氢铁离子试剂和质子化丙酮试剂来使用四极离子阱质谱(QITMS)来测量VOC质子转移率常数。控制QITMS中的离子分子反应时间的能力使得这种具有定量测量VOC反应速率常数的有吸引力的方法。这项工作的目标是确定QITMS中的反应速率常数,以便这些反应可用于量化VOC。

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