The Chemical Behavior of Low Valence Sulfur Compounds. V. Decomposition and Oxidation of Tetrathionate in Aqueous Ammonia Solution

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概要

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• The decomposition and oxygen oxidation of tetrathionate in aqueous ammonia solution have been investigated. In the decomposition, thiosulfate, sulfate and sulfamate were formed through penta- and trithionate as intermediate compounds. The molar ratio of the products (SO<SUB>4</SUB><SUP>2−</SUP>+SO<SUB>3</SUB>NH<SUB>2</SUB><SUP>−</SUP>)/S<SUB>2</SUB>O<SUB>3</SUB><SUP>2−</SUP> was roughly equal to 2/7, where 0.1N ammonia solution was used. The deficient use of ammonia made the solution neutral or weakly acidic and the precipitation of sulfur and the formation of higher polythionates were observed. The polythionate was detected by means of TLC (Thin Layer Chromatography). In the oxidation, tetrathionate was supposed to go through the following three sequent steps. 1) Decomposition of tetrathionate to form thiosulfate, tri- and pentathionate, and further decomposition of pentathionate to thiosulfate. 2) Oxidation of thiosulfate to tetrathionate and partly to sulfate. 3) Decomposition of trithionate to form sulfate, sulfamate and thiosulfate.

• 公益社団法人 日本化学会の論文

著者

• Okabe Taijiro

  Department Of Medicine And Bioregulatory Science (third Department Of Internal Medicine) Graduate Sc

• Naito Kunishige

  Department Of Materials Science Faculty Of Engineering Ibaraki University

• Shieh Mu-Chang

  Department of Applied Chemistry, Faculty of Engineering, Tohoku University

• Okabe Taijiro

  Department of Applied Chemistry, Faculty of Engineering

• Naito Kunishige

  Department of Applied Chemistry, Faculty of Engineering, Tohoku University

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