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Title
Measuring isoprene hydroxy hydroperoxides and Isoprene epoxydiols using a novel funnel SRI-ToF-MS / Bernhard Mentler
AuthorMentler, Bernhard
Thesis advisorHansel, Armin
PublishedInnsbruck, Juli 2018
Descriptionv, 63 Seiten : Illustrationen, Diagramme
Institutional NoteUniversität Innsbruck, Masterarbeit, 2018
Date of SubmissionAugust 2018
LanguageEnglish
Document typeMaster Thesis
Keywords (DE)Isopren Hydroxy Hydroperoxid / Isopren Epoxydiol / Funnel SRI-ToF-MS
URNurn:nbn:at:at-ubi:1-25151 Persistent Identifier (URN)
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 The work is publicly available
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Measuring isoprene hydroxy hydroperoxides and Isoprene epoxydiols using a novel funnel SRI-ToF-MS [3.83 mb]
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Abstract (English)

The oxidation of isoprene in the earth atmosphere can be separated in a high NOx pathway and a low NOx pathway. ISOPOOH (isoprene hydroxy hydroperoxide) and as a further result IEPOX (isoprene epoxidiol) are the pristine isoprene oxidation products. Previous experiments have shown, that ISOPOOH converts on metal surfaces to methyl vinyl ketone (MVK) and methacrolein (MACR) [Rivera-Rios et al., 2014]. As a consequence, standard versions of commercial SRI-ToF-MS (Selective Reagent Ion Time of Flight Mass Spectrometer) detected ISOPOOH as MVK or MACR and the experimental results were incorrect. Confronted with this problem, we developed a novel prototype of SRI-ToF-MS without metal surfaces in the drift tube, the Funnel SRI-ToF-MS. [Rivera-Rios et al., 2014] describes ISOPOOH conversion on metal surfaces to methyl vinyl ketone or methacrolein and formaldehyde. In this master thesis I come to the conclusion that a diol with the chemical formula C5H10O2 and a hydroxy carbonyl with chemical formula C5H8O2 are also created by ISOPOOH conversion on metal surfaces. I also show that chemical ionisation of ISOPOOH using H3O+ and NO+ primary ions leads to massive fragmentation. In ambient air measurements the fragments can interfere. A new primary ion mode is thus of high importance to detect ISOPOOH without fragmentation.

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