ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-1483-2012 Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid – a mass spectrometric study of SOA aging Müller L. 1 Reinnig M.-C. 1 Naumann K. H. 2 Saathoff H. 2 Mentel T. F. 3 Donahue N. M. 4 Hoffmann T. 1 Johannes Gutenberg-Universität, Institute for inorganic Chemistry and analytical Chemistry, Duesbergweg 10–14, 55128 Mainz, Germany Karlsruhe Institute of Technology Institute for Meteorology and Climate Research (IMK-AAF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany Forschungszentrum Jülich GmbH, ICG-2: Troposphäre, 52425 Jülich, Germany Carnegie Mellon University Department of Chemical Engineering, 5000 Forbes Avenue, Pittsburgh, PA 15213-3890, USA 08 02 2012 12 3 1483 1496 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/1483/2012/acp-12-1483-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/1483/2012/acp-12-1483-2012.pdf

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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