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离子选择电极分析是依据能斯特方程。测量离子选择电极与参比电极在溶液中所组成的电池的电动势,从而求得待测溶液中被测离子的活度a_1。双高输入阻抗电位仪(离子计)在离子选择电极分析中的应用大大地增加了电位分析法的精确度。它不仅可以用于直接电位法,浓差分析技术(零点电位法)等,适合于小量体积溶液的分析,消除因E_(液接)及活度系数的不肯定性所引起的测量误差,抵销各种参数变化的影响,比较直接地反映样品浓度的变化,而且为离子选择电极自动连续分析以及电极性能的研究等提供了一个有力的测试工具。
Ion-selective electrode analysis is based on the Nernst equation. Measure the electromotive force of the battery composed of the ion selective electrode and the reference electrode in solution to obtain the activity a_1 of the measured ion in the solution to be measured. The application of dual high input impedance potentiometers (ion meters) in ion-selective electrode analysis greatly increases the accuracy of the potential analysis method. It can not only be used in the direct potential method, concentration difference analysis technique (zero point potential method), etc., suitable for the analysis of a small volume of solution, eliminating the measurement error caused by the uncertainty of E_ (liquid junction) and activity coefficient, Offsetting the effects of various parameter changes, more directly reflect the sample concentration changes, but also for the ion selective electrode automatic continuous analysis and electrode performance studies provide a powerful test tool.