高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (8): 1111.

• 研究论文 • 上一篇    下一篇

碲在汞中的扩散系数和溶解度

张长庚, 徐逸心, 牟兰   

  1. 贵州大学化学系, 贵阳 550025
  • 收稿日期:1992-07-23 修回日期:1993-06-10 出版日期:1993-08-24 发布日期:1993-08-24
  • 通讯作者: 张长庚
  • 作者简介:第一作者:男, 56岁, 副教授.
  • 基金资助:

    国家自然科学基金

The Diffusion Coefficient and Solubility of Tellurium in Mercury

ZHANG Chang-Geng, XU Yi-Xin, Mu Lan   

  1. Department of Chemistry, Guizhou University, Guiyang, 550025
  • Received:1992-07-23 Revised:1993-06-10 Online:1993-08-24 Published:1993-08-24

摘要: 用阴极溶出计时安培法测定了碲在汞中的扩散系数和溶解度.在1mol/LNH3-NH4Cl和10-3mol/LTeO32-溶液中,用悬汞电极于-0.90V进行预电解,使Te(Ⅳ)还原到元素Te.然后在另一个电解池中阴极溶出使Te还原为Te2-.阴极溶出是在0.1mol/LNaOH溶液中,用计时安培法于-1.40V测定.根据下列方程式计算了碲在汞中的扩散系数D及溶解度S:D=r02/πt0,S=(4nFπ3/2D3/2t0)-1(Δi1/Δt-1/2.D和S的测定值分别为:1.52×10-5cm2/s及2.34×10-3wt%.实验结果表明碲在汞中以单原子态存在.

关键词: 碲, 扩散系数, 溶解度, 计时安培法

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 TeO32- at -0.90 V.As a result, tellurium( Ⅳ ) is reduced to elemental tellurium which then is reduced to Te2- 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 (ΔIt/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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