Nickel hexacyanoferrate membrane as a coated wire cation-selective electrode |
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Authors: | Giorgetti M Scavetta E Berrettoni M Tonelli D |
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Institution: | Department of Physical and Inorganic Chemistry, University of Bologna, Italy. |
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Abstract: | Nickel hexacyanoferrates containing alkali metal cations as counter ions were used to prepare ion-selective electrodes for potentiometric sensing of intercalated species in the coated wire electrode (CWE) configuration. All the electrodes developed display a quasi-Nernstian response towards potassium ion, whereas the highest sensitivity is generally achieved when Cs+ is the counter cation in the sensing material. The selectivity constants of the electrodes were calculated by the matched potential method considering K+ as the primary ion. The selectivity order is Cs+ > K+ > Na+ > Li+ and reflects the effective dimension of the hydrated cations. |
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