Abstract
A simple adsorptive cathodic stripping voltammetry method has been developed for antimony (III and V) speciation using 4-(2-thiazolylazo) - resorcinol (TAR). The methodology involves controlled preconcentration at pH 5, during which antimony(III) - TAR complex is adsorbed onto a hanging mercury drop electrode followed by measuring the cathodic peak current (I-p,I-c) at -0.39 V versus Ag/AgCl electrode. The plot of I-p,I-c versus antimony(III) concentration was linear in the range 1.35 x 10(-9)-9.53 x 10(-8) mol L-1. The LOD and LOQ for Sb(III) were found 4.06 x 10(-10) and 1.35 x 10(-9) mol L-1, respectively. Antimony(V) species after reduction to antimony(III) with Na2SO3 were also determined. Analysis of antimony in environment water samples was applied satisfactorily.