| 铂电极响应非电对离子的机理研究(Ⅱ) |
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| 引用本文： | 史生华,于书平,王仲文,索志荣,陈渭萍,赵时济,高鸿.铂电极响应非电对离子的机理研究(Ⅱ)[J].分析化学,2000,28(10):1199-1203. |
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| 作者姓名： | 史生华 于书平 王仲文 索志荣 陈渭萍 赵时济 高鸿 |
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| 作者单位： | 1. 华南理工大学化学系,广州,510641
2. 西北大学分析科学研究所,西安,710069 |
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| 基金项目： | 家自然科学基金，陕西省自然科学基金资助项目 |
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| 摘 要： | 预处理的铂电极对一系列金属离子Ｍ＾２＋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－ΔＧ＾０ｈ（Ｍ＾２＋）相当于离子交换反应的活化能。用离子交换过程ΔＧ＾－ｈ（Ｐ＾２＋ｔ）与ΔＧ＾０ｈ（Ｍ＾２＋）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。
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| 关 键 词： | 铂电极 瞬时电位信号 电极响应机理 电位滴定 |
Response Mechanism of Platinum Electrode to Uncoupled Ions (Ⅱ) |
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| Shi Shenghua,Yu Shuping,Wang Zhongwen,Suo Zhirong,Chen Weiping,Zhao Shiji,Gao Hong.Response Mechanism of Platinum Electrode to Uncoupled Ions (Ⅱ)[J].Chinese Journal of Analytical Chemistry,2000,28(10):1199-1203. |
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| Authors: | Shi Shenghua Yu Shuping Wang Zhongwen Suo Zhirong Chen Weiping Zhao Shiji Gao Hong |
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| Institution: | Shi Shenghua
,Yu Shuping
,Wang Zhongwen
,Suo Zhirong
,Chen Weiping
,Zhao Shiji
(Institute of Analytical Scienoe, Northwest University, Xi' an 710069) |
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| 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. |
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| Keywords: | Platinum electrode transient potential signal electrode response mechanism ion hydration free energy activation energy |
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