Collect. Czech. Chem. Commun.
1996, 61, 107-119
https://doi.org/10.1135/cccc19960107
Polarographic and Voltammetric Determination of 1-(4-Methoxyphenyl)-3-methyltriazene
Jiří Bareka, Eva Pertileováa, 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 1-(4-methoxyphenyl)-3-methyltriazene in a mixed aqueous-methanolic medium 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. A mechanism has been proposed for its polarographic reduction and optimal conditions have been found for its determination by tast polarography in the concentration range 2-100 μmol l-1 and by differential pulse polarography at a dropping mercury electrode, differential pulse voltammetry at a hanging mercury drop electrode and linear scan voltammetry at a hanging mercury drop electrode in the concentration range 0.2-100 μmol l-1. The sensitivity of the determination can be further improved through adsorptive accumulation of the test substance on the surface of the hanging mercury drop electrode; fifteen-second accumulation in stirred solution allows determination in the range 0.01-0.1 μmol l-1.
Keywords: 1-(4-Methoxyphenyl)-3-methyltriazine; Differential pulse polarography; Adsorptive stripping voltammetry.
