کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1193671 1492339 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A deuterium-labeling study on the reproduction of hydronium ions in the PTR-MS detection of ethanol
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A deuterium-labeling study on the reproduction of hydronium ions in the PTR-MS detection of ethanol
چکیده انگلیسی

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 162 Td 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.

The contribution of the channel reproducing H3O+ in the PTR-MS detection of ethanol was determined by detecting H2DO+ produced in reactions of H3O+ with deuterium-labeled ethanols.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volume 285, Issues 1–2, 1 August 2009, Pages 95–99
نویسندگان
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