Oxidation by chloramine-T
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When hydrogen sulphide is oxidised by chloramine-T, the sulphide may yield sulphur, or sulphate, or both the products. The relative proportion of the two products of oxidation depends on the pH, of the solution and on the presence of certain catalysts. At low pH, sulphate is produced in relatively high amounts, while at higher pH values, sulphur formation is greater. Presence of molybdate increases sulphate yield, while tungstate on the other hand, diminishes it. It is suggested that the primary product of oxidation of hydrogen sulphide is dihydrogen sulphoxide (H2SO) which, being analogous to hydrogen peroxide and hydrogen persulphide, is likely to be more stable at low pH values. The sulphoxide undergoes two simultaneous reactions, (a) decomposition into water and sulphur and (b) oxidation to sulphate. This accounts for the greater production of sulphate at low pH values, and of elemental sulphur in alkaline solutions.
KeywordsSulphoxide Elemental Sulphur Hydrogen Sulphide Sodium Arsenite Sodium Tungstate
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