论文部分内容阅读
用活度阶梯法研究了 Ag I,Ag Br,Cu S,Pb S和 Cd S电极对干扰离子的动力学响应 .溶液中含一定浓度主要离子时上述电极对某些干扰离子响应非单一突跃型瞬时信号 ;溶液中不含主要离子时 ,除了 Ag Br电极响应 Cl-外 ,其它都响应单一瞬时信号 .离子交换产物的溶解度越小 ,离子的水合焓差越小 ,瞬时信号峰高度越大 .离子水合焓差对瞬时信号峰高度的影响说明 ,试液高速喷向电极表面时由于扩散层厚度很薄 ,电极对干扰离子响应瞬时信号的峰电位不决定于离子扩散速度 ,而决定于离子交换速度 .除 Cu S电极外 ,根据其它电极非单一突跃型瞬时信号所测定的平衡电位选择性系数 Kexy与相应化合物溶度积比值是一致的 .
The kinetic response of Ag I, Ag Br, Cu S, Pb S and Cd S electrodes to interfering ions was studied by the activity-level method.The response of the above electrodes to some interfering ions was determined to be non- Type instantaneous signal; when the solution does not contain main ions, all respond to a single transient signal except Ag Br electrode responds to Cl-, the smaller the solubility of the ion exchange product, the smaller the enthalpy of hydration enthalpy of the ion, the larger the instantaneous signal peak height Ion hydration enthalpy difference on the instantaneous peak height of the signal shows that when the test solution is sprayed onto the electrode surface at high speed due to the diffusion layer thickness is thin, the electrode response to interfering ions instantaneous signal peak potential is not determined by the ion diffusion rate, but determined by ions Exchange rate, except for the Cu S electrode, the selectivity coefficient Kexy of the equilibrium potential determined by the non-uniform transient signal of the other electrodes is in agreement with the solubility product ratio of the corresponding compound.