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| Titel |
Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid – a mass spectrometric study of SOA aging |
| VerfasserIn |
L. Müller, M.-C. Reinnig, K. H. Naumann, H. Saathoff, T. F. Mentel, N. M. Donahue, T. Hoffmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 3 ; Nr. 12, no. 3 (2012-02-08), S.1483-1496 |
| Datensatznummer |
250010641
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| Publikation (Nr.) |
 copernicus.org/acp-12-1483-2012.pdf |
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| Zusammenfassung |
| This paper presents the results of mass spectrometric investigations of the
OH-initiated oxidative aging of α-pinene SOA under simulated
tropospheric conditions at the large aerosol chamber facility AIDA,
Karlsruhe Institute of Technology. In particular, the OH-initiated oxidation
of pure pinic and pinonic acid, two well-known oxidation products of
α-pinene, was investigated. Two complementary analytical techniques were
used, on-line atmospheric pressure chemical ionization/mass spectrometry
(APCI/MS) and filter sampling followed by liquid chromatography/mass
spectrometry (LC/ESI-MS). The results show that
3-methyl-1,2,3-butanetricarboxylic acid (MBTCA), a very low volatile
α-pinene SOA product and a tracer compound for terpene SOA, is formed
from the oxidation of pinonic acid and that this oxidation takes place in
the gas phase. This finding is confirmed by temperature-dependent aging
experiments on whole SOA formed from α-pinene, in which the yield of
MBTCA scales with the pinonic acid fraction in the gas phase. Based on the
results, several feasible gas-phase radical mechanisms are discussed to
explain the formation of MBTCA from OH-initiated pinonic acid oxidation. |
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