METHOD OF DETERMINING OSMIUM BY STRIPPING VOLTAMMETRY IN NATURAL AND MAN-MADE MATERIAL Russian patent published in 2013 - IPC G01N27/48 

FIELD: chemistry.

SUBSTANCE: method of determining osmium by stripping voltammetry in natural and man-made material involves transferring osmium (VIII) into a solution in form of volatile osmium tetraoxide and conducting catalytic, voltammetric determination, wherein osmium ions are accumulated on a soot electrode in a stirred solution in the presence of hydrogen peroxide for 60-120 s, followed by recording anodic peaks of electrocatalytic decomposition of hydrogen peroxide on an OsO₂ precipitate with potential sweep rate of 80-120 mV/s at electrolysis potential of minus 0.2 V on a background electrolyte of 0.05-0.1 M CH₃COOH; concentration of osmium ions is determined from the height of the anodic reverse peak of catalytic decomposition of hydrogen peroxide on the current-voltage curve in a potential range from plus 0.1 V to plus 0.3 V relative a saturated silver chloride electrode by standard addition.

EFFECT: invention enables to reduce the limit and lower bound of determined osmium content based on the peak of electrocatalytic decomposition of hydrogen peroxide, obtained after electroconcentration of OsO₂ on a soot electrode by stripping voltammetry.

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