阳极溶出催化极谱法测定微量碲

使用经典极谱法测定碲的灵敏度往往不能令人满意,后来出现了溶出伏安法和极谱催化波都提高了灵敏度。至于把二者结合起来应用于碲的测定尚未见报导。本法是把碲电解富集在工作电极上,然后在选定的催化体系中溶出,使其产生溶出催化波,从而提高了灵敏度。

DETERMINATION OF TRACE AMOUNTS OF TELLURIUM BY ANODIC STRIPPING-CATALYTIC WAVE OF POLAROGRAPHY

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.