| Title: | Glyoxal induced atmospheric photosensitized chemistry leading to organic aerosol growth |
| Author(s): | Rossignol S; Aregahegn KZ; Tinel L; Fine L; Noziere B; George C; |
| Address: | "Universite de Lyon , Universite Lyon 1, Lyon, F-69626, France and CNRS, UMR5256, IRCELYON, Institut de Recherches sur la Catalyse et l'Environnement de Lyon , Villeurbanne, F-69626, France" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "In recent years, it has been proposed that gas phase glyoxal could significantly contribute to ambient organic aerosol (OA) mass through multiphase chemistry. Of particular interest is the reaction between glyoxal and ammonium cations producing light-absorbing compounds such as imidazole derivatives. It was recently shown that imidazole-2-carboxaldehyde (IC) can act as a photosensitizer, initiating aerosol growth in the presence of gaseous volatile organic compounds. Given the potential importance of this new photosensitized growth pathway for ambient OA, the related reaction mechanism was investigated at a molecular level. Bulk and flow tube experiments were performed to identify major products of the reaction of limonene with the triplet state of IC by direct (+/-)ESI-HRMS and UPLC/(+/-)HESI-HRMS analysis. Detection of recombination products of IC with limonene or with itself, in bulk and flow tube experiments, showed that IC is able to initiate a radical chemistry in the aerosol phase under realistic irradiation conditions. Furthermore, highly oxygenated limonene reaction products were detected, clearly explaining the observed OA growth. The chemistry of peroxy radicals derived from limonene upon addition of oxygen explains the formation of such low-volatile compounds without any traditional gas phase oxidant" |
| Keywords: | Aerosols/analysis/*chemistry Cyclohexenes/chemistry Environmental Monitoring/*methods Gases/analysis/chemistry Glyoxal/*chemistry Limonene Photochemical Processes Terpenes/chemistry; |
| Notes: | "MedlineRossignol, Stephanie Aregahegn, Kifle Z Tinel, Liselotte Fine, Ludovic Noziere, Barbara George, Christian eng Research Support, Non-U.S. Gov't 2014/02/22 Environ Sci Technol. 2014 Mar 18; 48(6):3218-27. doi: 10.1021/es405581g. Epub 2014 Feb 28" |
