It is becoming generally accepted that the aqueous phase oxidation of SO2 by H2O2 is an important mechanism of SO2 oxidation in the atmosphere. There exists good agreement between the experimental studies of the kinetics of the reaction, however there is ambiguity in some of the parameters employed in extrapolating, laboratory results to the atmosphere. It is shown that measurements of H2O2 concentration in rainwater are lower than those expected in equilibrium with ambient air concentrations of H2O2. The possible role of free radicals in H2O2 chemistry and SO2 oxidation in atmospheric droplets is discussed. On the basis of the data available at present we may expect considerable uncertainty in predictions of SO2 oxidation rates via the SO2 and H2O2 reaction in the atmosphere and the relative contribution of this process to the overall conversion of atmospheric SO2 is still unclear.
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M. Radojević (1983) studied this question.
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