A deuterium-labeling study on the reproduction of hydronium ions in the PTR-MS detection of ethanol
A deuterium-labeling study on the reproduction of hydronium ions in the PTR-MS detection of ethanol
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DOI：
10.1016/j.ijms.2009.05.001
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发表时间：
2009-08-01
影响因子：
1.8
通讯作者：
Tanimoto, Hiroshi
中科院分区：
文献类型：
--
作者：
Inomata, Satoshi;Tanimoto, Hiroshi
用质子转移反应质谱（PTR-MS）研究了水合氢离子（H3 O+）与乙醇（C2 H5 OH）和氘标记乙醇（CD 3CH 2 OH和CH 3CD 2 OH）的反应。除了H3 O+与C2 H5 OH的质子化反应外，先前还暗示了产生C2 H5+、CH 2 OH+和H3 O+离子的三个裂解过程。在本文中，我们报告了这四个通道的分支比在六个不同的场强（E/N比）的漂移管。通过检测H3 O+与氘标记的乙醇（CD 3CH 2 OH和CH 3CD 2 OH）反应中产生的m/z 20处的H2 DO+离子来确定再现水合氢离子（H3 O+）的通道的贡献。发现在E/N比的108和162 Td之间，H3 O+离子的再现是显著的，然而，它不能定量地解释PTR-MS对乙醇的低检测灵敏度，表明存在未鉴定的反应通道。未识别的反应通道可能是H3 O +-再生通道本身，因为在该实验中，由于损失过程，例如H2 DO+和H2O之间的H/D交换，该通道的贡献将被低估。(C)2009爱思唯尔有限公司版权所有。
The reactions of hydronium ions (H3O+) with ethanol (C2H5OH) and deuterium-labeled ethanols (CD3CH2OH and CH3CD2OH) were investigated by means of proton transfer reaction mass spectrometry (PTR-MS). Besides the protonation reaction of H3O+ with C2H5OH, three fragmentation processes yielding C2H5+, CH2OH+, and H3O+ ions were previously implied. In this paper, we report the branching ratios for those four channels at six different field strengths (E/N ratios) of the drift tube. The contribution of the channel that reproduces hydronium ions (H3O+) was determined by detecting H2DO+ ions at m/z 20 produced in reactions of H3O+ with deuterium-labeled ethanols (CD3CH2OH and CH3CD2OH). The reproduction of H3O+ ions was found to be significant between 108 and 162Td of the E/N ratio, however, it did not quantitatively account for the low detection sensitivity of ethanol by PTR-MS, suggesting the presence of unidentified reaction channel(s). The unidentified reaction channel(s) might be the H3O+-reproducing channel itself, because the contribution from this channel would be underestimated in this experiment due to loss process(es) such as an H/D exchange between H2DO+ and H2O. (C) 2009 Elsevier B.V. All rights reserved.