The iron(III)-catalyzed autoxidation of sulfur(IV)-oxides results in the formation of two different oxidation products of sulfur(IV): dithionate, S2O62-, and sulfate, SO42-. The yield of these reaction products depends on the experimental conditions. Under the studied conditions ([Fe(III)]:[SIV)]=1:10, pH = 2-4) dithionate is the minor reaction product. The formation of dithionate is influenced by the initial pH but not by the initial O2concentration. The presence of Co2+, Mn2+,, and Ni2+have no influence on the yield of dithionate, whereas in the presence of Cr3+less and, in the presence of CU2+, no dithionate is formed.
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