%0 Journal Article
%A Müller, L.
%A Reinnig, M.C.
%A Naumann, K.H.
%A Saathoff, H.
%A Mentel, T.F.
%A Donahue, N.M.
%A Hoffmann, T.
%T Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid - a mass spectrometric study of SOA aging
%J Atmospheric chemistry and physics
%V 12
%@ 1680-7316
%C Katlenburg-Lindau
%I EGU
%M PreJuSER-23105
%P 1483 - 1496
%D 2012
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000300656500016
%R 10.5194/acp-12-1483-2012
%U https://juser.fz-juelich.de/record/23105