Abstract
Abstract The quantitative determination of some low valence sulfur compounds, especially low polythionates, which appeared as intermediate products in the oxidation of elemental sulfur with compressed oxygen in aqueous ammonia was investigated by means of thin-layer chromatography and colorimetry with methylene blue to establish the mechanism of the oxidation of elemental sulfur. Thiosulfate and some low polythionates could be resolved clearly by thin-layer chromatography using silica gel as an absorbent. A suitable solvent for the development was a mixed solution of ethyl alcohol, n-butyl alcohol, aqueous ammonia, ammonium acetate and distilled water. The amount of sulfur in the developed spot of the thin-layer chromatogram was determined photometrically with precision of 10 to 20% using methylene blue as a color reagent. Sulfate, sulfite and thiosulfate could not be developed effectively by this method.
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