Radical-initiated formation of organosulfates and surfactants in atmospheric aerosols

Details Radical-initiated formation of organosulfates and surfactants in atmospheric aerosols Radical-initiated formation of organosulfates and surfactants in atmospheric aerosols

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3705806n&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 5, CiteID L05806

Physics

6

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Many atmospheric aerosols contain both organic compounds and inorganic material, such as sulfate salts. In this work, we show that these sulfates could trigger some chemical transformations of the organic compounds by producing sulfate radicals, SO4-, when exposed to UV light (280-320 nm). In particular, we show by mass spectrometry (LC/ESI-MSMS) that isoprene, methyl vinyl ketone, methacrolein, and α-pinene in irradiated sulfate solutions (ammonium and sodium sulfate) produce the same organosulfates as previously identified in aerosols, and even some that had remained unidentified until now. With a typical time constant of 9 h instead of 4600 days for esterifications, these radical reactions would be a plausible origin for the atmospheric organosulfates. These reactions also produced efficient surfactants, possibly resembling the long-chain organosulfates found in the experiments. Thus, photochemistry in mixed sulfate/organic aerosols could increase cloud condensation nuclei (CCN) numbers, which would be supported by previous atmospheric observations.

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