Shinagawa M, Yano N, Kurosu T
Department of Nuclear Engineering, Faculty of Engineering, Osaka University, Yamadakami, Suita-shi, Osaka, Japan.
Talanta. 1972 Apr;19(4):439-50. doi: 10.1016/0039-9140(72)80105-x.
The polarogram of tellurium(IV) in weakly basic solution has a sharp maximum on the diffusion current plateau. The electrode process causing this maximum has been examined by means of various techniques such as semiconductor catalysis, "block" polarography and ultraviolet irradiation of the dropping mercury electrode. The maximum was found to be caused by the catalytic wave of hydrogen produced by the tellurium deposited on the mercury surface. Part of the tellurium is reduced to hydrogen telluride by nascent hydrogen formed catalytically. The brown mist which usually appears in the vicinity of the surface of the dropping mercury cathode consists of elemental tellurium produced by the decomposition of the hydrogen telluride near the electrode. The sudden decrease in the current maximum at a potential more negative than the peak potential of the maximum is due to desorption of tellurium, caused by movement of mercury.
碲（IV）在弱碱性溶液中的极谱图在扩散电流平台上有一个尖锐的极大值。已通过多种技术，如半导体催化、“阻滞”极谱法和滴汞电极的紫外线照射，研究了导致该极大值的电极过程。发现该极大值是由沉积在汞表面的碲产生的氢的催化波引起的。部分碲被催化形成的初生态氢还原为碲化氢。通常出现在滴汞阴极表面附近的棕色雾状物是由电极附近碲化氢分解产生的元素碲组成的。在比极大值的峰值电位更负的电位下电流极大值的突然下降是由于汞的移动导致碲的解吸。
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