Journal
ANALYTICAL CHEMISTRY
Volume 76, Issue 22, Pages 6535-6540Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac048975f
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Organic acids in the gas and aerosol phase from photooxidation of 1,3,5-tximethylbenzene in the presence of 300 ppb propene and 300 ppb NOx in smog chamber experiments were determined using a wet effluent diffusion denuder/aerosol collector coupled to ion chromatography (IC) with conductivity detection. Behind the IC, the samples were collected using a fraction collector, for identification of unresolved/unidentified organic acids with IC-mass spectrometry (MS). In total, 20 organic acids were found with MS of which 10 were identified. The organic acids identified offline by IC-MS were then further quantified based on the online IC data. The identification was additionally confirmed with gas chromatography-mass spectrometry. At the maximum aerosol concentration, organic acids comprised 20-45% of the total aerosol mass. The method has a detection limit of 10-100 ng/m(3) for the identified carboxylic acids.
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