碱性介质中二过碲酸合铜（Ⅲ）配离子氧化丙酮酸钾的动力学

本文采用分光光度法研究了碱性介质中二过碲酸合铜（Ⅲ）配离子氧化丙酮酸钾的反应动力学。结果表明当丙酮酸钾（ｐｙ）［ｐｙ］》［Ｃｕ（Ⅲ）］时，反应对Ｃｕ（Ⅲ）是准一级反应，表观速率常数Ｋｏｂｓ随着［ｐｙ］的增加而增加，但随着的增加而减小，有正盐效应。提出了包含前期平衡的反应机理，据此求出了不同温度下速控步骤的速率常数及２５℃的活化参数，并且能圆满地解释所有实验事实。

Kinetics and Mechanism of Oxidation of Potassium Pyruvate by Ditellurato-cuprate(Ⅲ) Complex Ion in Alkaline Medium

The kinetics of oxidation of potassium pyruvate by ditellurato-cuprate(Ⅲ) complex ion was studied by spectrophotometrically in alkaline medium .It was found that the rate with respect to [Cu(Ⅲ)] is unity. A linear relationship between [py]/ kobs and [py] was observed, where kobs stands for pseudo-first-order rate constant kobs decreases with the increase of or [OH-]. There is a positive salt effect. The active species and a plausible mechanism involing free redical have been proposed. All the experimental phenomena can be explained by the rate equation derived from the mechanism. The rate constants of rate-determing step together with the activation parameters have also been evalvated.