Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16585-2008 http://www.atmos-chem-phys-discuss.net/8/16585/2008/ http://www.atmos-chem-phys-discuss.net/8/16585/2008/acpd-8-16585-2008.html http://www.atmos-chem-phys-discuss.net/8/16585/2008/acpd-8-16585-2008.pdf 16585 16608 2008-09-01 Secondary organic aerosol formation from reaction of tertiary amines with nitrate radical M. E. Erupe D. J. Price P. J. Silva phil.silva@usu.edu Q. G. J. Malloy L. Qi B. Warren D. R. Cocker III Department of Chemistry and Biochemistry, Utah State University, Logan, UT, USA Department of Chemical and Environmental Engineering and College of Engineering, Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, CA, USA Secondary organic aerosol formation from the reaction of tertiary amines with nitrate radical was investigated in an indoor environmental chamber. Particle chemistry was monitored using a high resolution aerosol mass spectrometer while gas-phase species were detected using a proton transfer reaction mass spectrometer. Trimethylamine, triethylamine and tributylamine were studied. Results indicate that tributylamine forms the most aerosol mass followed by trimethylamine and triethylamine respectively. Spectra from the aerosol mass spectrometer indicate the formation of complex non-salt aerosol products. We propose a reaction mechanism that proceeds via abstraction of a proton by nitrate radical followed by RO₂ chemistry. Rearrangement of the aminyl alkoxy radical through hydrogen shift leads to the formation of hydroxylated amides, which explain most of the higher mass ions in the mass spectra. These experiments show that oxidation of tertiary amines by nitrate radical may be an important night-time source of secondary organic aerosol. Angelino, S., Suess, D. T., and Prather, K. 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