Collect. Czech. Chem. Commun. 1987, 52, 2149-2159

The polarographic and voltammetric determination of N,N-dimethyl-4-amino-3'-methylazobenzene

Jiří Bareka, Tibor J. Pastorb, Simona Votavováa and Jiří Zimaa

a Department of Analytical Chemistry, Charles University, 128 40 Prague 2, Czechoslovakia
b Department of Analytical Chemistry, Belgrade University, 110 01 Belgrade, Yugoslavia


The polarographic reduction of N,N-dimethyl-4-amino-3'-methylazobenzene has been studied, a mechanism has been proposed and conditions have been found for the determination of this depolarizer using TAST polarography and differential pulse polarography at a classical dropping mercury electrode and using fast scan differential pulse voltammetry and linear scan voltammetry at a hanging mercury drop electrode. The detection limit at this electrode is about 10-8 mol l-1; a further decrease can be attained using adsorption accumulation of the determined azo-substance on the surface of the working electrode. In conclusion, the practical usefulness of these methods combined with extraction or thin-layer chromatography was verified.