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The heterogeneous reactionSO2 + H2O2 <img border="0" src="/img/rarrow.gif" width="24" height="9"> H2SO4 on ice at228 K has been studied in a low temperature coated-wall flow tube. With H2O2 in excess ofSO2, the loss of SO2 on an ice surface is time dependent with the reaction most efficient on a freshly exposed surface. The deactivation of thesurface arises because the protons formed in the reaction inhibit the dissociation of adsorbedSO2. This lowers the surface concentrations of HSO3-, a participant in the rate-determining step of the oxidationmechanism. For a fixed SO2 partial pressure of 1.4 x 10-4Pa, the reaction probabilities for SO2 loss on a freshly exposed surface scale linearly withH2O2 partial pressures between 2.7 x 10-3 and 2.7x 10-2 Pa because the H2O2 surface coverage is unsaturated in this regime. Conversely, the reaction probabilitiesdecrease as the partial pressure of SO2 is raised from 2.7 x 10-5 to 1.3x 10-3 Pa, for a fixed H2O2 partial pressure of 8.7x 10-3 Pa. This is expected if the rate determining step for the mechanism involvesHSO3- rather than SO2. It may also arise to some degree if there is competition between gas phaseSO2 and H2O2 for adsorption sites. The reaction is sufficiently fast that the lifetime ofSO2 within ice clouds could be controlled by this heterogeneous reaction and not by the gas-phase reaction with OH

Oxidation of SO 2 by H 2 O 2 on ice surfaces at 228 K: a sink for SO 2 in ice clouds

Oxidation of SO ₂ by H ₂ O ₂ on ice surfaces at 228 K: a sink for SO ₂ in ice clouds