FIELD: chemistry.
SUBSTANCE: invention is aimed at determining gold (III) in aqueous solutions by differential pulse voltammetry. A method of determining gold via a differential pulse voltammetric method in aqueous solutions includes electrochemical concentration of gold (III) ions on the surface of different types of graphite electrodes in the form of gold followed by dissolving and recording cathode current-voltage curves; accumulating gold (III) ions on the surface of the graphite electrode in a mixed solution for 60 s with electrolysis potential of -0.8 V; measurements are taken on a background of 0.1 M NaOH, followed by recording cathodic peaks and plotting current-voltage curves in differential pulse mode with a sweep rate of 80 mV/s; concentration of gold (III) ions is determined from the height of the cathodic peak in the potential range of -0.2 V to -0.5 V relative to a saturated silver chloride electrode by standard addition method.
EFFECT: invention enables to reduce the maximum and lower boundary of determined gold concentrations on a cathodic peak obtained after electrooxidation of gold on a graphite electrode by differential pulse voltammetry.
1 dwg, 2 tbl, 2 ex
