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The aqueous oxidation of SO2 by OH radicals
Abstract The reaction of aqueous hydroxyl radicals with bisulphite ion has been proposed as a significant and in some cases a primary pathway by which SO2 is oxidized to sulphate in tropospheric cloud. It is shown that many uncertainties still remain with regard to the kinetics and mechanism of this oxidation process. Illustrative computations indicate that reaction schemes taking account of the aqueous oxidation of SO2 by OH in existing models of cloud chemistry are inconsistent with the mechanisms on which they are based and yield a wide range of oxidation rates. Calculations are presented which suggest that the reaction of the SO5 − radical with bisulphite ion is rate determining, although the rate constant remains uncertain. The products of this reaction must be identified before the mechanism of sulphate production can be elucidated and the relevance of this process to tropospheric SO2 oxidation reliably assessed.
The aqueous oxidation of SO2 by OH radicals
Abstract The reaction of aqueous hydroxyl radicals with bisulphite ion has been proposed as a significant and in some cases a primary pathway by which SO2 is oxidized to sulphate in tropospheric cloud. It is shown that many uncertainties still remain with regard to the kinetics and mechanism of this oxidation process. Illustrative computations indicate that reaction schemes taking account of the aqueous oxidation of SO2 by OH in existing models of cloud chemistry are inconsistent with the mechanisms on which they are based and yield a wide range of oxidation rates. Calculations are presented which suggest that the reaction of the SO5 − radical with bisulphite ion is rate determining, although the rate constant remains uncertain. The products of this reaction must be identified before the mechanism of sulphate production can be elucidated and the relevance of this process to tropospheric SO2 oxidation reliably assessed.
The aqueous oxidation of SO2 by OH radicals
McElroy, W.J. (author)
Atmospheric Environment ; 20 ; 323-330
1985-06-10
8 pages
Article (Journal)
Electronic Resource
English
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