ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-1-2011 Physico-chemical characterization of SOA derived from catechol and guaiacol – a model substance for the aromatic fraction of atmospheric HULIS Ofner J. 1 Krüger H.-U. 1 Grothe H. 2 Schmitt-Kopplin P. 3 5 Whitmore K. 4 Zetzsch C. 1 Atmospheric Chemistry Research Laboratory, University of Bayreuth, Germany Institute of Materials Chemistry, Vienna University of Technology, Austria Institute of Ecological Chemistry, Helmholtz Zentrum Munich, Germany University Service Centre for Transmission Electron Microscopy, Vienna University of Technology, Austria Department for Chemical-Technical Analysis, Research Center Weihenstephan for Brewing and Food Quality, Technical University Munich, Freising-Weihenstephan, Germany 03 01 2011 11 1 1 15 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/1/2011/acp-11-1-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/1/2011/acp-11-1-2011.pdf

Secondary organic aerosol (SOA) was produced from the aromatic precursors catechol and guaiacol by reaction with ozone in the presence and absence of simulated sunlight and humidity and investigated for its properties as a proxy for HUmic-LIke Substances (HULIS). Beside a small particle size, a relatively low molecular weight and typical optical features in the UV/VIS spectral range, HULIS contain a typical aromatic and/or olefinic chemical structure and highly oxidized functional groups within a high chemical diversity. Various methods were used to characterize the secondary organic aerosols obtained: Fourier transform infrared spectroscopy (FTIR) demonstrated the formation of several carbonyl containing functional groups as well as structural and functional differences between aerosols formed at different environmental conditions. UV/VIS spectroscopy of filter samples showed that the particulate matter absorbs far into the visible range up to more than 500 nm. Ultrahigh resolved mass spectroscopy (ICR-FT/MS) determined O/C-ratios between 0.3 and 1 and observed <i>m/z</i> ratios between 200 and 450 to be most abundant. Temperature-programmed-pyrolysis mass spectroscopy (TPP-MS) identified carboxylic acids and lactones/esters as major functional groups. Particle sizing using a condensation-nucleus-counter and differential-mobility-particle-sizer (CNC/DMPS) monitored the formation of small particles during the SOA formation process. Particle imaging, using field-emission-gun scanning electron microscopy (FEG-SEM), showed spherical particles, forming clusters and chains. We conclude that catechol and guaiacol are appropriate precursors for studies of the processing of aromatic SOA with atmospheric HULIS properties on the laboratory scale.

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