APPLICATION OF ANODIC REDISOLUTION VOLTAMPEROMETRY FOR THE DETERMINATION OF ANTIMONIUM

Abstract:

A voltammetric method was validated to determine the concentration of antimony in aqueous medium. The voltammetric technique of anodic bkp_redissolution was used, using a potentiostat. Chronoamperometry was applied at E=-1, 2 V for 50 s. A linear sweep voltammetry was applied with potentials between Ei=-1, 2 V and Ef= 0, 5 V at a speed of 20 mV/s. This was carried out in 0, 5 M H3 PO4 electrolytic solution, where an increase in the current intensity peak can be observed as a function of the concentration of the solutions evaluated at a potential of 84, 96 mV. To validate the method, linearity, precision, limit of detection and limit of quantification were determined. Four concentrations of antimony were prepared in triplicate, in a range of 1, 5, 10, 15, 20 mg/L, respectively. A calibration curve of experimental concentration expressed as current intensity (I) vs theoretical concentration was constructed. The linearity was …

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