Collect. Czech. Chem. Commun. 1991, 56, 216-222

The effect of thiazine dyes on polarographic determination of tellurium

Ludmila Kiriyak

Laboratory of Electrochemical Methods, Institute of Chemistry, Moldavian Academy of Sciences, 277028 Kishinev, U.S.S.R.


The effect of thionine, azure I and methylene blue on the electroreduction of tellurium(IV) has been studied in the solutions of oxalic, tartaric and trihydroxyglutaric acids. It has been shown that the electrode process is complicated by adsorption of all components of the electrochemical reaction. This causes an increase of the tellurium analytical signal. The determinations is not hampered by great excesses of various elements. Optimal conditions were found according to which determinations were carried out of tellurium in binary mixtures Pb-Te, Cd-Te, Fe-Te, Bi-Te and of tellurium admixtures in bismuth of high purity, doped by tellurium.