Study of an Opportunity of Using Solid Electrodes for Express Determination of Tellurium in Alkaline Solutions
T. P. ALEKSANDROVA1,2, O. V. KARUNINA1, and O. E. KOPTYAEVA2
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: tellurium, cathode reduction, alkaline electrolyte, solid indicator electrodes, electroanalysis
Pages: 127-132
Abstract
Tellurium reduction in alkaline solutions in the concentration range of tellurite ions of 0.001-1 М was studied by a voltammetric method on updated solid indicator electrodes (Au, Pt, Ni and graphite). It was detected that a change in the form of the cathode current-potential curve was observed for all electrodes at constant alkali concentrations and an increase in the tellurium concentration in solutions above 0.2-0.3 М. It was found that a change in the ratio of hydroxide and tellurite ions concentrations could be one of the probable causes for this. An opportunity of using the studied electrodes for express control of the tellurium concentration in the alkaline electrolyte used to obtain high purity tellurium was demonstrated.
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