Abstract
A method has been developed for the determination of trace amounts of total inorganic sulphur in aqueous solutions. It is based on rapid reduction of the sulphur compounds by a mixture of hydroiodic acid and hypophosphite to hydrogen sulphide, followed by oxidation to sulphur dioxide and instantaneous microcoulometric titration. The high sensitivity of the titration technique allows the detection of sulphur in concentrations as low as 0.01 mg l -1; each analysis requires only 3–4 min. Metals, phosphorus and halogens do not interfere. The method is usable for aqueous samples such as boiler water, plant effluents and solutions obtained after appropriate destruction of organic and inorganic materials.
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