电解质浓溶液的离子选择电极选择系数的测定

The Measurement of Selectivity Coefficient of Ion Selective Electrode by an Interferential Ion Addition

采用干扰离子的加入法，并利用Ｐｉｔｚｅｒ方程，获得了离子选择电极在高浓度电解质溶液中的干扰离子选择系数。给出了实验原理、实验过程及测定结果，并与常用的分别溶液法和混合溶液法的测定结果进行了比较和讨论。采用干扰离子的加入法测定高浓度电解质溶液中离子选择电极的选择系数，更好地反映了在高浓度电解质溶液中离子选择电极对干扰离子的电位响应。

The Measurement of selectivity coefficient of ion selective electrode（ISE) was measured by an interferential ion addition. In this study, the Pitzer model was used to calculate the activities of ions in high concentration electrolyte solution. Comparison of selectivity coefficient of ISE measured by different method such as the separate solution method and the fixed interference method,was discussed. This work can be used to measure selectivity coefficient of ISE in high con- centration electrolyte solution.