Abstract
IN an attempt to derive a mechanism for the formation of atmospheric sulphate particles, several workers have investigated the oxidation of sulphur dioxide1. The mechanisms proposed for such conversion have centred on either the absorption of sulphur dioxide by water droplets and the aqueous phase oxidation of the sulphite, enhanced by catalytic activity2, or gas phase photochemical reactions involving sulphur dioxide, air, moisture and olefinic hydrocarbons3. More recently, however, consideration has been given to non-photochemical reactions between these gases, in the absence of free water surfaces, which lead to particulate formation.
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