Collect. Czech. Chem. Commun.
1997, 62, 597-608
https://doi.org/10.1135/cccc19970597
Polarographic and Voltammetric Determination of N,N-Dimethyl-4-amino-4'-sulfoazobenzene
Jiří Bareka, Pham Tuan Haia, Viktor Mejstříkb, Josino C. Moreirac and Jiří Zimaa
a UNESCO Laboratory of Environmental Electrochemistry, Department of Analytical Chemistry, Charles University, 128 40 Prague 2, Czech Republic
b Centre for Ecology, Toxicology and Analysis, Research Institute for Organic Syntheses, 532 18 Pardubice-Rybitví, Czech Republic
c CESTEH/ENSP/FIOCRUZ, Rua Leopoldo Bulhoes, 1480 Manguinhos, 21041-210 Rio de Janeiro, Brazil
Abstract
The polarographic behaviour of N,N-dimethyl-4-amino-4'-sulfoazobenzene was investigated by tast polarography and differential pulse polarography at a dropping mercury electrode, constant-potential coulometry at a large area mercury electrode and cyclic voltammetry at a hanging mercury drop electrode. Optimum conditions have been found for its determination by tast polarography in the concentration range of 2-100 μmol l-1, differential pulse polarography at a dropping mercury electrode in the concentration range of 0.2-100 μmol l-1 and by differential pulse voltammetry at a hanging mercury drop electrode in the concentration range of 0.02-10 μmol l-1. The sensitivity of the determination can be further improved by adsorptive accumulation of the test substance on the hanging mercury drop electrode. Three-minute accumulation in stirred solution allows determination in the range of 0.2-100 nmol l-1.
Keywords: Polarography; Voltammetry; N,N-Dimethyl-4-amino-4'-sulfoazobenzene.
