Voltammetric Studies and Determination of Antimony(III)

摘要

A detailed voltammetric study of Sb(III) has resulted in optimization of analytical conditions for determination of antimony at low concentration of submicrogram level by using differential pulse polarographic method. Among different supporting electrolytes investigated for the study of Sb(III), 0.8 M glycolic acid-ammonia was found most adequate where a well-defined wave was obtained at -0.30 V for the electroreduction of Sb(III) to Sb(0). It was observed that on increasing the concentration of Sb( III) the peak current increased linearly up to a concentration of 30 ppm. Limit of determination was observed to be 0.01 μg/mL. Cu(II), Pb(II), Cd(II), As(III) and Zn(II) did not interfere. The differential pulse polarography determination of antimony(III) was evaluated for its accuracy and precision in terms of standard deviation and percentage error. The method has been successfully applied for analysis of antimony in industrial waste samples and atomic absorption spectrophotometer method was used to compare the results obtained by differential pulse polarography.