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| Titel |
The Chemistry of Isoprene Hydroxy Hydroperoxides (ISOPOOH) |
| VerfasserIn |
Jean Rivera, John Crounse, Tran Nguyen, Werner Jud, Jason St. Clair, Tomas Mikoviny, Jessica Gilman, Brian Lerner, Alex Teng, Kelvin Bates, John Seinfeld, Joost DeGouw, Armin Wisthaler, Armin Hansel, Paul Wennberg, Frank Keutsch |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105799
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| Publikation (Nr.) |
 EGU/EGU2015-5378.pdf |
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| Zusammenfassung |
| Organic hydroperoxides are important oxidation products of volatile organic compounds,
especially under low-NOx conditions. Despite their large global importance, the
low-NOx pathways are not well understood. High-NOx oxidation pathways that
typically produce carbonyls have been studied extensively. The formation of organic
hydroperoxides makes the study of low-NOx pathways challenging, as this class of
compounds is not commercially available and the synthetic methods used to prepare them
are still underdeveloped. This poses challenges for both quantification of these
low-NOx products as well as characterization of instruments with them. Isoprene
hydroxyhydroperoxides (ISOPOOH) are the main first-generation products of the low-NOx
isoprene oxidation pathway; it is estimated that globally over 50% of isoprene peroxy radicals
form ISOPOOH. We present a study of the kinetics of the formation of several
ISOPOOH isomers as well as their atmospheric sinks. We also present instrument
characterization studies that demonstrate that ISOPOOH is an interference in both GC and
PTR-MS measurements. In these instruments ISOPOOH isomers are observed as
the corresponding products (carbonyls) of the high-NOx pathway. We discuss the
interference mechanism as well as the implications of this interference on studies of
OH reactivity, O:C ratios, OH recycling and secondary organic aerosol formation. |
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