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Atmos. Chem. Phys. Discuss., 9, 15567-15594, 2009
www.atmos-chem-phys-discuss.net/9/15567/2009/ doi:10.5194/acpd-9-15567-2009 © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. |
Secondary organic material formed by methylglyoxal in aqueous aerosol mimics – Part 2: Product identification using Aerosol-CIMS
Department of Chemical Engineering, Columbia University, New York, NY, USA
Abstract. We used chemical ionization mass spectrometry with a volatilization flow tube inlet (Aerosol-CIMS) to characterize secondary organic material formed by methylglyoxal with ammonium sulfate in aqueous aerosol mimics. Bulk reaction mixtures were diluted and atomized to form submicron aerosol particles. Organics were detected using Aerosol-CIMS in positive and negative ion mode using I− and H3O+·(H2O)n as reagent ions. The results are consistent with aldol condensation products, carbon-nitrogen species, sulfur-containing compounds, and oligomeric species up to 759 amu. These results support previous observations by us and others that ammonium sulfate plays a critical role in the SOA formation chemistry of dicarbonyl compounds.
Citation: Sareen, N., Shapiro, E. L., Schwier, A. N., and McNeill, V. F.: Secondary organic material formed by methylglyoxal in aqueous aerosol mimics – Part 2: Product identification using Aerosol-CIMS, Atmos. Chem. Phys. Discuss., 9, 15567-15594, doi:10.5194/acpd-9-15567-2009, 2009.