Influence of Fe and mn ions on the incorporation of radioactive 35SO2 by sulfate aerosols
Abstract
The rate of incorporation of radiolabeled sulfur dioxide has been determined in submicron sized ammonium sulfate droplet aerosols with and without catalytic metal ions (Fe3+, Mn2+). The sulfate droplets were generated by nebulizing solutions with a multiple jet Collison nebulizer and aged up to 30 min in a 10 m3 plug-flow reaction duct. Radiolabeled 35SO2 was metered into purified air to provide a concentration of 5 ppm. Three different atmospheres were studied: SO2 in purified air, SO2 in the presence of ammonium sulfate aerosol (1 mg m-3, 1 μm MMAD), and SO2 in the presence of ammonium sulfate aerosol containing Fe3+ and Mn2+ ions. No measurable SO2 conversion was detected in samples from atmospheres without the catalytic metal ions. A net SO2 conversion rate equivalent to 0.02 % h-1 was observed in the presence of Fe3+ and Mn2+ ions. © 1985.
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