TY  - JOUR
AU  - Müller, L.
AU  - Reinnig, M.C.
AU  - Naumann, K.H.
AU  - Saathoff, H.
AU  - Mentel, T.F.
AU  - Donahue, N.M.
AU  - Hoffmann, T.
TI  - Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid - a mass spectrometric study of SOA aging
JO  - Atmospheric chemistry and physics
VL  - 12
SN  - 1680-7316
CY  - Katlenburg-Lindau
PB  - EGU
M1  - PreJuSER-23105
SP  - 1483 - 1496
PY  - 2012
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000300656500016
DO  - DOI:10.5194/acp-12-1483-2012
UR  - https://juser.fz-juelich.de/record/23105
ER  -