【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。更多还原

【Abstract】 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.更多还原