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Identification of polymers as major components of atmospheric organic aerosols
Authors:Kalberer M  Paulsen D  Sax M  Steinbacher M  Dommen J  Prevot A S H  Fisseha R  Weingartner E  Frankevich V  Zenobi R  Baltensperger U
Institution:Department of Chemistry and Applied Biosciences, ETH Zurich, 8053 Zurich, Switzerland. kalberer@org.chem.ethz.ch
Abstract:Results from photooxidation of aromatic compounds in a reaction chamber show that a substantial fraction of the organic aerosol mass is composed of polymers. This polymerization results from reactions of carbonyls and their hydrates. After aging for more than 20 hours, about 50% of the particle mass consists of polymers with a molecular mass up to 1000 daltons. This results in a lower volatility of this secondary organic aerosol and a higher aerosol yield than a model using vapor pressures of individual organic species would predict.
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