Abstract
A limited survey of rainwater composition covering 80 precipitation events was carried out to establish the levels of soluble metal ions which may influence the oxidation rate of SO 2 in the aqueous phase. For 40 of the samples sodium sulphite was added at low concentrations and the rate of oxidation of S(IV) to S(VI) established. The first order rate constant k s(IV) was found to vary over three orders of magnitude, from 10 −5 to 10 −2 s −1. pH and iron concentrations were found to be the most important factors affecting the rate. There was poor correlation between the rate of oxidation and the manganese, copper and zinc concentrations. The absolute values of the rate constants are lower than those used in recent modelling studies of atmospheric droplets and the importance of iron relative to manganese also differs from earlier studies.
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