Journal Article PreJuSER-23105

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Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid - a mass spectrometric study of SOA aging

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2012
EGU Katlenburg-Lindau

Atmospheric chemistry and physics 12, 1483 - 1496 () [10.5194/acp-12-1483-2012]

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Abstract: This paper presents the results of mass spectrometric investigations of the OH-initiated oxidative aging of alpha-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 alpha-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 alpha-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 alpha-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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Note: We thank the AIDA team at KIT for their effective support during the measurement campaign and the EUROCHAMP-2 project within the EC 7th framework programme for financial support.

Contributing Institute(s):
  1. Troposphäre (IEK-8)
Research Program(s):
  1. Atmosphäre und Klima (P23)

Appears in the scientific report 2012
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Medline ; Creative Commons Attribution CC BY 3.0 ; DOAJ ; OpenAccess ; Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2012-11-13, last modified 2024-07-12


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