METHOD OF DETERMINING BISMUTH IN AQUEOUS SOLUTIONS BY STRIPPING VOLTAMMETRY ON SELECTIVE ELECTROOXIDATION PEAKS OF BISMUTH FROM INTERMETALLIC COMPOUND Au₂Bi

摘要

FIELD: chemistry.;SUBSTANCE: method of determining bismuth in aqueous solutions by stripping voltammetry on peaks for selective electrooxidation of bismuth from an intermetallic compound Au₂Bi according to the invention involves transferring bismuth (III) from a sample to a solution and conducting voltammetric determination, which is characterised by that bismuth is accumulated on polyethylene-impregnated graphite electrodes in a mixed solution in the presence of gold ions for 60-120 s, followed by detection of selective electrooxidation peaks of bismuth (III) from the intermetallic compound Au₂Bi, at a potential sweep rate of 60-100 mV/s and electrolysis potential from -0.3 to -1.1 V on backgrounds: 0.5-1.0 M HNO₃ or 0.5-1.0 M HCl. Concentration of bismuth (III) ions is determined from the value of area under voltage versus current curves at potential ranging from +0.05 V to +0.20 V relative a saturated silver chloride electrode using a certified mixture addition technique.;EFFECT: determining bismuth in aqueous solutions by stripping voltammetry.;2 dwg, 2 tbl, 2 ex