Studies on Nitrate-Affected SO_2 Oxidation and Their Perspectives

摘要

The widely held view that reactions of relatively low rate constants may be safely neglected in the modelling of aqueous phase chemistry should be verified. As shown for the cross-activation of S(IV) and nitrate, the neglected reactions may accelerate, possibly by orders of magnitude, due to an increase of the concentration of inorganic components in desiccating aerosols. The use of a chamber reactor for "confining a cloud in a cage" and treating it as a modified gas phase is suggested, here, as an approach to reasonably simplified modelling of chemical composition changes in real clouds. A comparison between the results obtained using a large volume chamber reactor and those calculated from the aqueous phase model, based on data collected using small laboratory reactors, should shed light on the importance of gas-side and liquid-side resistances to mass transfer.