用微电极上的光谱电化学法测定催化反应的速率常数

DETERMINATION OF RATE CONSTANTS OF CATALYTIC REACTION BY SPECTROELECTROCHEMISTRY WITH MICROELECTRODES

首次采用微电极上的光谱电化学法测定了K_4Fe(CN)_6-抗坏血酸、K_4Fe(CN)_6-组氨酸体系的催化反应速率常数。实验发现,当抗坏血酸或组氨酸的浓度同K_4Fe(CN)_6的浓度相当甚至稍低时,仍可按准一级化学反应来处理,并提出了合理的解释。

The rate constants of catalytic reaction of ferrocyanide-ascorbic acid and ferrocyanide-histidine system were determined by transmitted spectroelectrochemistry using a group of cyclindrical microelectrodes. It is the first time to find that the reaction can still be considered as the pseudo-first-order reaction when the concentration of ascorbic acid or histidine is close to and even slightly lower than the concentration of ferrocyanide. The determined rate constants are in agreement with the reported values. A reasonable explaination was given.