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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L24811,
6 PP., 2007
doi:10.1029/2007GL031338
3-methyl-1,2,3-butanetricarboxylic acid: An atmospheric tracer for terpene secondary organic aerosol
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Department of Chemistry, California Institute of Technology, Pasadena, California, USA
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Department of Chemistry, University of Antwerp, Antwerp, Belgium
Alion Science and Technology, Research Triangle Park, North Carolina, USA
National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
Departments of Chemical Engineering and Environmental Science and Engineering, California Institute of Technology, Pasadena, California, USA
Department of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University, Ghent, Belgium
Department of Pharmaceutical Sciences, University of Antwerp, Antwerp, Belgium
Highly oxygenated compounds assigned to be oxidation products of α-pinene have recently been observed in substantial concentrations in ambient aerosols. Here, we confirm the unknown α-pinene tracer compound with molecular weight (MW) 204 as the C8-tricarboxylic acid 3-methyl-1,2,3-butanetricarboxylic acid. Its gas and liquid chromatographic behaviors and its mass spectral characteristics in electron ionization and negative ion electrospray ionization perfectly agree with those of a synthesized reference compound. The formation of this compound is explained by further reaction of cis-pinonic acid involving participation of the OH radical. This study illustrates that complex, multi-generation chemistry holds for the photooxidation of α-pinene in the presence of NOx.
Received 16 July 2007; accepted 22 October 2007; published 27 December 2007.
Citation: (2007), 3-methyl-1,2,3-butanetricarboxylic acid: An atmospheric tracer for terpene secondary organic aerosol, Geophys. Res. Lett., 34, L24811, doi:10.1029/2007GL031338.
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