Abstract
Kinetics and product distribution of the reaction of dimethylsulfoxide (DMSO) and methanesulfinate (MSI −) with OH radicals and H 2O 2 in the aqueous phase are reported in this work. DMSO is found to be very stable in pure water or in solutions containing H 2O 2. On the other hand, it reacts very rapidly ( k=4.5×10 9 M −1 s −1) with OH radicals. MSI − has been identified as the main intermediate product, while methanesulfonate (MS −) and sulfate were the final products due to the very fast reaction of MSI − with OH radicals ( k=1.2×10 10 M −1 s −1). MS − has been identified as the major end product (yield higher than 95%) of both DMSO and MSI − reactions by OH radicals in aqueous solutions. The potential implications of these reactions for the biogenic sulfur cycle in the atmosphere are presented and discussed.
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