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10.5194/acpd-9-24411-2009
http://www.atmos-chem-phys-discuss.net/9/24411/2009/
http://www.atmos-chem-phys-discuss.net/9/24411/2009/acpd-9-24411-2009.html
http://www.atmos-chem-phys-discuss.net/9/24411/2009/acpd-9-24411-2009.pdf
24411
24422
2009-11-16
Mechanism of UV-light induced SO<sub>2</sub> oxidation to H<sub>2</sub>SO<sub>4</sub>
A. Sorokin
andrey.sorokin@mpi-hd.mpg.de
Max Planck Institute for Nuclear Physics, P.O. Box 103980, 69029 Heidelberg, Germany
The electron-excited chemistry of sulfur dioxide oxidation induced by UV
irradiation of air with trace O<sub>3</sub> and SO<sub>2</sub> is considered. The
importance of this mechanism is evaluated based on recent laboratory
experiments on SO<sub>2</sub> oxidation in a laminar tube with air induced by
UV irradiation. Results show that under respective conditions the route of
SO<sub>2</sub> oxidation involving electron excited oxygen molecules may be as
efficient as a known OH-radical mechanism. Hence, an influence of UV
irradiation on SO<sub>2</sub> oxidation chemistry, if confirmed, may provide an
additional external source affecting the oxidation and aerosol formation
processes in atmosphere.
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