Atmospheric condensed-phase reactions of glyoxal with methylamine

Details Atmospheric condensed-phase reactions of glyoxal with methylamine Atmospheric condensed-phase reactions of glyoxal with methylamine

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3611819d&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 11, CiteID L11819

Physics

8

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Processes: Clouds And Aerosols, Atmospheric Composition And Structure: Constituent Sources And Sinks

Scientific paper

Glyoxal reacts with methylamine in drying cloud droplet/aerosol surrogates to form high molecular mass oligomers along with smaller amounts of 1,3-dimethylimidazole and light-absorbing compounds. The patterns observed by high-resolution time-of-flight aerosol mass spectrometry indicate that oligomers form from repeated imine units. The reactions are 1st order in each reactant: rate-limiting imine formation is followed by rapid dimer and oligomer formation. While excess methylamine evaporates from the droplet, half the glyoxal does not, due to self-oligomerization reactions that occur in the absence of methylamine. Glyoxal irreversibly traps volatile amine compounds in the aerosol phase, converting them into oligomers. This is the first reported mechanism for the formation of stable secondary organic aerosol (SOA) material from methylamine, a substance with only one carbon, and could produce as much as 11 Tg SOA yr-1 globally if glyoxal reacts exclusively by this pathway.

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