Precursor effects on SO2 oxidation |
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| Affiliation: | 1. Leibniz-Institute for Tropospheric Research, Permoserstr. 15, Leipzig, Germany;2. ARCHERS, CENSER, De La Salle University, Manila, Philippines;3. Institute of Environmental Science and Meteorology, University of the Philippines Diliman, Philippines;4. Department of Physics, Ateneo de Manila University, Quezon City, Philippines;5. Federal Environment Agency, Berlin, Germany;6. Manila Observatory, Quezon City, Philippines |
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| Abstract: | Smog chamber experiments were conducted to determine the relationships between SO2 oxidation and the gaseous precursors common in polluted air: NOz, NMHC (a mixture of 17 hydrocarbons) and SO2. SO2 oxidation to sulfate aerosols was first-order in SO2. The maximum rate of oxidation was strongly related to initial NMHC/NOx ratios, but over 6-h irradiation intervals, the conversion of SO2 to sulfate aerosol was only weakly related to initial NMHC/NOx ratios. For constant NMHC/NOx ratios. SO2 conversion was independent of NMHC and NO, concentrations. Typical SO2 oxidation rates for polluted air ranged from 2–8%/h. but the higher rates were sustained for only a few hours. SO2 lifetimes > 100 h are predicted from these experiments, in accord with kinetic simulations of photochemical smog and lifetimes derived from tropospheric data. |
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