Abstract:

In this paper, a new method for determination of trace amounts of tellurium by anodic stripping-catalytic wave has been proposed. The experiments have shown that in NaCl or NaBr base-solution the Te(Ⅳ) is deposited on the glassy carbon electrode during the pre-electrolysis and then the deposition Te is stripped in the catalytic system which consists of SnCl₂-HCl-H₂S0₄-HCl0₄,and a stripping-cataltic wave is obtained. In the paper, the conditions of the determination, such as the choice of base-solution, acidity, deposition potential, deposition time, the componente of catalytic system, temperature etc, are investigated.Optimum conditions for determination of tellurium are defined. There is a linear relationship between the stripping-catalytic current and the concentration of tellurium in 1×10^-7 M-4×10^-9 M region. The detection limit can be estimated at 8×10^-10 M. Using this method, we have determined trace amounts of tellurium in the natural water and the solid samples.