β-caryophyllinic acid: An atmospheric tracer for β-caryophyllene secondary organic aerosol

The chemical compositions of ambient PM2.5 samples, collected in Research Triangle Park, North Carolina, USA, and a sample of secondary organic aerosol, formed by irradiating a mixture of the sesquiterpene (SQT), β‐caryophyllene, and oxides of nitrogen in a smog chamber, were chemically analyzed usi...

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Bibliographic Details
Published in:Geophysical research letters 2007-03, Vol.34 (5), p.n/a
Main Authors: Jaoui, Mohammed, Lewandowski, Michael, Kleindienst, Tadeusz E., Offenberg, John H., Edney, Edward O.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Secondary Organic aerosol
Sesquiterpene
Tracer
β-Caryophyllene
β-Caryophyllinic acid
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Summary:The chemical compositions of ambient PM2.5 samples, collected in Research Triangle Park, North Carolina, USA, and a sample of secondary organic aerosol, formed by irradiating a mixture of the sesquiterpene (SQT), β‐caryophyllene, and oxides of nitrogen in a smog chamber, were chemically analyzed using derivative‐based GC‐MS methods. The analyses showed the presence of an oxidized compound, tentatively identified as β‐caryophyllinic acid, in both the ambient PM2.5 field samples and in the smog chamber sample. The seasonal concentrations of β‐caryophyllinic acid in the ambient PM2.5 samples were 0.5, 0.9, 7.0, and 0.5 ng m−3 during the winter, spring, summer and fall respectively. To our knowledge, this is the first time that an oxidation product of a sesquiterpene, a hydrocarbon with high secondary organic aerosol yields and emitted from plants and trees in significant quantities, has been detected in ambient PM2.5 samples.
ISSN:0094-8276
1944-8007
DOI:10.1029/2006GL028827