FIELD: analytical methods.
SUBSTANCE: quantitative determination of platinum by kinetic method consists in measuring change in optical density of solution being investigated over a period of time wherein ferric sulfosalicylate in solution is catalytically reduced to ferrous sulfosalicylate with tin chloride at room temperature. Determination is accomplished in presence of 1.4-1.7 M aqueous hydrochloric acid. Determining platinum is possible in presence of palladium in amount up to 30-fold and gold up to 0.1-fold ratio to platinum.
EFFECT: increased selectivity in determining platinum, simplified procedure, and increased determination activity.
3 cl, 1 tbl
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