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.
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ACKNOWLEDGMENTS
The authors kindly acknowledge Professor V.V. Malev for his interest in this study and stimulating discussions.
Funding
The study was performed with financial support from Russian Foundation for Basic Research, grant 19-03-00259.
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This paper is dedicated to the 80th anniversary of Professor V.V. Malev who has made a considerable contribution into modern directions of electrochemistry.
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Kondratyeva, Y.O., Solovyeva, E.V., Khripoun, G.A. et al. Paradox of the Variation of the Bulk Resistance of Potassium Ion-Selective Electrode Membranes within Nernstian Potentiometric Response Range. Russ J Electrochem 55, 1118–1126 (2019). https://doi.org/10.1134/S1023193519110090
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DOI: https://doi.org/10.1134/S1023193519110090