FIELD: chemistry.
SUBSTANCE: method of determining platinum in ores via stripping voltammetry involves converting platinum (IV or II) from a sample into a solution and performing voltammetric determination, for which platinum is accumulated on a soot or uglesitall electrode in a stirred solution in the presence of indium (III) ions for 50…100 s with subsequent recording of peaks of selective electro-oxidation of indium from the intermetallic compound PtxIny with potential sweep rate of 50…150 mV/s first at electrolysis potential -1.0 V, and then at -0.4 V on a background electrolyte of 1…3 M HCl. Concentration of platinum ions is determined from the height of the indium peak on the volt-ampere curve at potential ranging from -0.05 to 0.05 V relative a saturated silver chloride electrode by adding standard mixtures.
EFFECT: invention enables to lower the limit and lower boundary of determined content of platinum from the peak for electro-oxidation of indium from an intermetallic compound PtxIny, obtained after electro-concentration of a binary residue of platinum-indium on a soot electrode.
2 ex, 2 tbl, 2 dwg
