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| Titel |
Measuring isoprene hydroxy hydroperoxides (ISOPOOH) and isoprene epoxydiols (IEPOX) with a novel SRI-ToF-MS |
| VerfasserIn |
Bernhard Mentler, Ben Lepesant, Werner Jud, Martin Breitenlechner, Frank Keutsch, Armin Hansel |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153898
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| Publikation (Nr.) |
 EGU/EGU2017-18933.pdf |
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| Zusammenfassung |
| The global emission rate of isoprene is estimated to be 540 Tg C per year. Hence, isoprene has an important impact on the oxidation capacity of the atmosphere. In low NOx regions isoprene predominantly reacts with OH producing Isoprene hydroxy hydroperoxides (ISOPOOH) and isoprene epoxidiols (IEPOX). Recent experiments have shown that ISOPOOH converts on metal surfaces to methyl vinyl ketone and methacrolein, the isoprene oxidation products under high NOx conditions. Therefore standard SRI-ToF-MS (Selective Reagent Ion – Time of Flight – Mass Spectrometer) instruments with metal drift tubes detect ISOPOOH as methyl vinyl ketone and methacrolein.
We have developed a novel SRI-ToF-MS prototype without metal surfaces in the drift tube. In NO+ primary ion mode ISOPOOH can be detected as C5H9O+. The new SRI-ToF-MS also uses NH4+ primary ions. This NH4+ mode enables detection of the isomers ISOPOOH and IEPOX without fragmentation.
Furthermore, we reveal more metal surface conversion products of the different ISOPOOH isomers. A C5-diol (C5H10O2) and a C5-hydroxy carbonyl (C5H8O2) are also products from ISOPOOH conversion on metal surfaces. |
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