APPLICATION OF HYDROGEN-PALLADIUM AND DEUTERIUM-PALLADIUM ELECTRODES IN THE COULOMETRIC-POTENTIOMETRIC DETERMINATION OF BASES IN SOME DIPOLAR APROTIC-SOLVENTS

The application of H-2/Pd and D-2/Pd electrodes as indicator, generato r and reference electrodes in coulometric-potentiometric titrations of bases in acetonitrile, benzyl cyanide, nitromethane, ethylene carbona te and sulfolane, was investigated. Current-potential curves for hydro gen and deuterium dissolved in palladium, titrated bases, indicator an d solvents show that hydrogen and deuterium are oxidized at potentials which are more negative than those of the titrated base and other com ponents present in the solution. The generated H+ and D+ ions were use d for the titration of organic bases (tributylamine, collidine, 2,2'-b ipyridine, cyclohexylamine, N,N'-diphenyl guanidine, butylamine and qu inoline) with visual and potentiometric titration end-point detection. The current efficiency was 100%. H-2/Pd and D-2/Pd electrodes were ap plied as indicator and reference electrodes.