Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Chemical Behavior of Low Valence Sulfur Compounds. VIII. The Oxidation of Sodium Thiosulfate with Ozone
Masahiro TakizawaAkitsugu OkuwakiTaijiro Okabe
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1973 Volume 46 Issue 12 Pages 3785-3789


The oxidation of sodium thiosulfate with ozone in an aqueous solution was investigated as a part of a series of studies on the chemical behavior of such low-valence sulfur compounds as thiosulfate and sulfite. The ozone oxidation was carried out by blowing a mixed gas of ozone and oxygen continuously into a 0.3–0.6 mol/l solution of sodium thiosulfate at 10–80°C. In a neutral solution, thiosulfate is converted to sulfate, sulfite, tri- and tetrathionates, hydrogen sulfide and sulfur dioxide, and finally to sulfate, tri- and tetrathionates. The yield of the sulfate is only 40% of the total sulfur. In an alkaline solution, however, thiosulfate is oxidized to sulfite as an intermediate, and finally to sulfate.
The oxidation of sodium sulfite, and potassium salts of tri- and tetrathionate with ozone was also studied in order to elucidate its mechanism.

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