Determination of Cu(II) ion in the Presence of Sb(III) ion by Anodic Stripping Polarography

Abstract

Sb(III) complexes were formed upon mixing Sb(III) ion with gluconate ion and gave rise to the two-stepped wave, whose half-wave potential of the first steps was -0.15 V (anodic wave)and that of the second -1.15 V vs. SCE (cathodic one).
Cu(II)ion, however, did not react with gluconate ion in a solution containing 0.1mol/l sodium gluconate and 0.2 1 mo1/l ammonia, and gave two-stepPed wave of Cu(II)-ammine complexes.
{(E, i, ), =-0.23 V, (E, /, ), =-0.43 V vs. SCE} In view of a great difference between Cu(II)and Sb(III)ves, it was possible to determine Cu(II)on in the presence of Sb(III) anodic stripping po1arography with square wave techniques.
Calibration curves were obtained by measuring the wave height of the second step for Cu ion whose concentration was raising from 0.0l to 0.1 ppm in O.1 mol/1 sodium gluconate, 0.4 mo1/l ammonia and 0.4 mol/l KCI medium. Up to 100PPm of Sb(III)ion, Sb(III)ion did ot interfere the determination of Cu(II)ion, whose concentration was 0.1 PPm.