The oxidation of the sulphide ion at very low concentrations in aqueous solutions
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 647-651
- https://doi.org/10.1039/j19680000647
Abstract
The oxidation, by oxygen, of the sulphide ion at very low concentrations in aqueous solutions has been studied at various temperatures and hydrogen ion concentrations. Under all conditions the reaction was close to first order with respect to the sulphide ion when other variables were constant. The rate of oxidation was enhanced by an increase of pH and temperature, and by increasing the oxygen:nitrogen ratio in the gas mixture. The overall reaction is summarized as follows HS–+ O2→ SO3 2–+ H+, SO3 2–+½ O2→ SO4 2–, SO3 2–+ HS–+½ O2→ S2O3 2–+ OH–, S2O3 2–+½ O2→ SO4 2–+ S. The first reaction is the initial rate-determining step, followed by the rapid removal of SO3 2– ion from solution as SO4 2– and S2O3 2–, and finally the slow oxidation of the S2O3 2– ion and elementary sulphur to SO4 2–.Keywords
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