Title

Water-soluble organic compounds in ambient aerosol: A study using positive ion mode electrospray ionization Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry

Document Type

Conference Proceeding

Publication Date

4-7-2013

Abstract

Water-soluble organic compounds of atmospheric aerosol were analyzed using positive electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Ambient aerosol collected at a nonurban high elevation site near Steamboat Springs, CO. Approximately, 2400 molecular formulas were assigned to the positive ions containing carbon, hydrogen, oxygen, nitrogen, and sulfur atoms in the range of m/z 100-800. The double bond equivalents (DBE) range, mean O:C, mean H:C, and oxidation state of carbon were 0 - 18, 0.25 ± 0.15, 1.39 ± 0.29, and -0.89 ± 0.23, respectively. A majority of the CHOS, CHNOS, and CHS formulas were highly unsaturated with mean DBE values of 12, 13, and 10, respectively. A majority of the CHNO and CHO formulas were more saturated with mean DBE values of 5 and 3, respectively. Several CHNO formulas were observed to be common with those of other studies including biomass burning aerosol and aged products of limonene ozonolysis.

Publication Title

245th American Chemical Society & Exposition