Fisseha, RebekaDommen, JosefSax, MirjamPaulsen, DwaneKalberer, MarkusMaurer, RolfHöfler, FrankWeingartner, ErnestBaltensperger, Urs2024-08-142024-08-142004-10-150003-27001520-688210.1021/ac048975fhttps://irf.fhnw.ch/handle/11654/46781Organic acids in the gas and aerosol phase from photooxidation of 1,3,5-trimethylbenzene 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/m3 for the identified carboxylic acids.en660 - Technische Chemie01A - Beitrag in wissenschaftlicher Zeitschrift6535-6540