Collect. Czech. Chem. Commun. 1989, 54, 1549-1563

The polarographic and voltammetric determination of the 4'-haloderivatives of N,N-dimethyl-4-aminoazobenzene

Jiří Barek, Helena Haladová-Bláhová and Jiří Zima

Department of Analytical Chemistry, Charles University, 128 40 Prague 2


The polarographic reduction of 4-haloderivatives of N,N-dimethyl-4-aminoazobenzene has been studied in mixed water-methanol medium, a mechanism has been proposed and optimal conditions have been found for determination of these substances by TAST polarography with a determination limit of about 1.10-6 mol l-1, by differential pulse polarography with a determination limit of about 1.10-7 mol l-1 and linear scan voltammetry with a determination limit of about 5.10-8 mol l-1. In the latter technique, the determined substance was accumulated by adsorption on the surface of a hanging mercury drop electrode to decrease the determination limit below 1.10-8 mol l-1.