FIELD: measurement equipment.
SUBSTANCE: invention may be used in different industries for detection of various concentrations of metal ions in solutions. The method to identify platinum in aqueous solutions or process drains by the method of stripping voltammetry according to invention consists in the fact that platinum (IV or II) is transferred into a chloride complex in a solution, and voltammetric identification is carried out, at the same time platinum ions are accumulated on a carbon-black or coal-ceramised electrode in a mixed solution in presence of indium ions (III) for 60-120 seconds with further registration of anode peaks of selective electric oxidation of indium from an intermetallic compound Ptxlny at the speed of potential sweep 50-150 mV/s at electrolysis potentials of minus 1.0 V, and then at minus 0.4 V on a background electrolyte 1-3 M HCl, concentration of platinum ions is determined by height of anode peak of indium on a voltammetric curve in the potential range from minus 0.2 to plus 0.1 V relative to a saturated chloride-silver electrode by method of additives of certified mixtures.
EFFECT: invention provides for possibility to reduce a limit and lower limit of detected contents of platinum (IV) by a peak of indium electric oxidation from an intermetallic compound PtxIny, produced after electric concentration of a binary residue of platinum-indium on a carbon-black electrode by the method of stripping voltammetry.
2 ex, 2 tbl, 2 dwg
