The polarographic behaviour of copper(l1) and palladium(ll) has been studied using salicylaldehyde tris(hydroxymethy1)methylamine (ST) as a complexing agent in a 0.1 M ammoniaammonium chloride (supporting electrolyte) medium. Well defined diffusion-controlled waves were obtained for both systems. Reversible and irreversible waves were observed for copper and palladium systems, respectively. The concentration ranges of copper(l1) and pailadium(ll) studied were 0.15-1.6 and 0.5-1.8 mM, respectively. A method is suggested for the simultaneous determination of these metals when they are present together in pure solutions as the difference in their fi values is sufficient for the purpose. The method has also been applied to the simultaneous determination of these metal ions in some synthetic samples and in alloys.
The electrochemical behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones has been investigated at dme and gc electrodes in buffer solutions of pH 2.0, 4.0, 6.0, 8.0 and 10.0 using dc polarography and cyclic voltammetry and coulometry. The compounds exhibit one well defined wave in the entire pH range of study. The process is irreversible and diffusion controlled. Controlled potential electrolysis indicates the involvement of four electrons in the reduction process. The effect of solvent, cations and anions, temperature and substitutents on the mechanism of reduction has been studied. Based on the results obtained the mechanism of reduction has been suggested.
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