铂电极响应非电对离子的机理研究(Ⅱ)  

Response Mechanism of Platinum Electrode to Uncoupled Inos(Ⅱ)

作　　者：史生华[1] 于书平[2] 王仲文[1] 索志荣[1] 陈渭萍 赵时济 高鸿[1] 

机构地区：[1]西北大学分析科学研究所,西安710069 [2]华南理工大学化学系,广州510641

出　　处：《分析化学》2000年第10期1199-1203,共5页Chinese Journal of Analytical Chemistry

基　　金：家自然科学基金;陕西省自然科学基金资助项目

摘　　要：预处理的铂电极对一系列金属离子Ｍ２＋活度阶梯变化的响应都是非单一突跃型瞬 时信号。提出了离子交换反应历程，认为离子水合吉氏自由能　　相当于离子交换 反应的活化能。用离子交换过程面　　与西　　之差合理地解释了不同离子瞬时信 号峰高的次序、证明电极瞬时电位不是决定于离子扩散速度而是决定于离子交换速度。The responses of pretreated platinum electrode to a sudden step change in the activity of a series of metal ions are all nonmonotonic overshoot-type transient signals. The mechanism of ion exchange reaction is given, the Gibbs free energy of ion hydration, is considered to be equal to the activation energy in ion-exchange reaction. The order of the peak height in the transient signal of different ions was reasonably explained by the difference between and . It was proved that the transient potential of the electrode was not determined by the velocity of ion diffusion but by that of ion exchange.

关 键 词：铂电极 瞬时电位信号 电极响应机理 电位滴定 

分 类 号：O657.1[理学—分析化学]