Abstract

Bulk resistance and other electrochemical properties of membranes of K⁺-selective electrodes (ISEs) containing valinomycin are measured by means of chronopotentiometry and electrochemical impedance. It is shown that the bulk resistance of the membranes, within the Nernstian potentiometric response range, increases along decrease of KCl concentration in solution. Analogous results were reported earlier for Ca²⁺ and NO\(_{3}^{ - }\) ISEs. This non-constancy of the bulk resistance is in conflict with current views on the mechanism of ISEs response. Tentatively, this paradox is ascribed to heterogeneity of membranes due to water uptake from solution.

中文翻译：

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能斯特电位响应范围内钾离子选择电极膜的大电阻变化的悖论

抽象的

借助于计时电位法和电化学阻抗来测量含有金霉素的K ⁺ -选择电极（ISE）的膜的体积电阻和其他电化学性质。结果表明，在Nernstian电位响应范围内，膜的体积电阻随着溶液中KCl浓度的降低而增加。对于Ca ²⁺和NO \（_ {3} ^ {-} \） ISE，类似的结果先前已有报道。整体阻力的这种非恒定性与对ISE响应机制的当前观点相冲突。暂时地，这种悖论归因于由于从溶液中吸收水而引起的膜的异质性。