The Diffusion Coefficient and Solubility of Tellurium in Mercury

Abstract

Abstract: The cathodic stripping chronoamperometry is used for the determination of the diffusion coefficient and solubility of tellurium in mercury.The hanging mercury drop electrode is used as the working electrode.The pre-electrolysis is perfomed in a solution of 1 mol/L NH₃-NH₄Cl + 1.00×10^-3 mol/L TeO₃^2- at -0.90 V.As a result, tellurium( Ⅳ ) is reduced to elemental tellurium which then is reduced to Te^2- on cathodic stripping in another cell.The cathodic stripping determination is perfomed in 0.1 mol/L NaOHat -1.40 Vby chronoamperometry.According to the following equation the diffusion coefficient Dand solubility Sof tellurium in mercury is calculated:D=r₀²/(πt₀), S=[4nF(πD)^3/2t₀]^-1 (ΔI_t/Δt^-1/2).The experimental results show that telluriun exists as the monoatomic state in mercury.

Key words: Tellurium, Diffusion coefficient, Solubility, Chronoamperometry

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ZHANG Chang-Geng, XU Yi-Xin, Mu Lan . The Diffusion Coefficient and Solubility of Tellurium in Mercury[J]. Chem. J. Chinese Universities, 1993, 14(8): 1111.

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The Diffusion Coefficient and Solubility of Tellurium in Mercury

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