Authors:	Müller, Lars Reinnig, Marc-Christopher Naumann, K. H. Saathoff, H. Mentel, T. F. Donahue, N. M. Hoffmann, Thorsten
Title:	Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid : a mass spectrometric study of SOA aging
Online publication date:	4-Oct-2022
Year of first publication:	2012
Language:	english
Abstract:	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.
DDC:	540 Chemie 540 Chemistry and allied sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7800
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/3.0/
Journal:	Atmospheric chemistry and physics 12 3
Pages or article number:	1483 1496
Publisher:	Copernicus Publ.
Publisher place:	Göttingen
Issue date:	2012
ISSN:	1680-7324 1680-7316
Publisher URL:	http://dx.doi.org/10.5194/acp-12-1483-2012
Publisher DOI:	10.5194/acp-12-1483-2012
Appears in collections:	DFG-OA-Publizieren (2012 - 2017)