Differential pulse voltammetric determination of trace Te(IV) at a poly (3,3′-diaminobenzidine) film modified gold electrode in flow systems

Electropolymerization of 3,3'-diaminobenzidine on a gold surface gave an adherent, stable film of poly(3,3'-diaminobenzidine) (PDAB). This polymer film retained the complexational functionalities of its monomer, demonstrating preconcentration abilities for several ions, including Se(IV) and Te(IV). In particular, in this work, continuous flow and flow injection methods were developed for the sensitive and selective determination of Te(IV). The optimized method for the continuous flow mode had a detection limit of 5.6 x 10(-9) mol 1(-1) for 10 min preconcentration. Typical relative standard deviations for six consecutive determinations were 1.82 and 2.56% for Te(IV) concentrations of 1.0 x 10(-6) and 5.0 x 10(-8) mol 1(-1), respectively (10 min preconcentration). The method was applied to the determination of Te(IV) in real samples. (C) 2002 Elsevier Science B.V. All rights reserved.