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Cation-Response Mechanism of Neutral Carrier Based Ion-Selective Electrode Membranes

✍ Scribed by Werner E. Morf; Wilhelm Simon

Publisher
John Wiley and Sons
Year
1986
Tongue
German
Weight
696 KB
Volume
69
Category
Article
ISSN
0018-019X

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✦ Synopsis

Results of voltammetric, potentiometric, chronoamperometric, ion transport, and extraction studies on neutral carrier based, plasticized polyfvinyl chloride) membranes are summarized. They unambiguously confirm that such bulk membranes dispose of immobile anionic sites. These fixed sites lead to a Donnun exclusion of other anions from the membrane and thus to a permselectivity for cations. The results are in perfect agreement with the predictions of earlier membrane models. A rigorous Poisson-Boltzmunn analysis of macroscopic liquid membranes clearly indicates that space-charge at the membrane/solution interfaces does not influence the electrochemical properties and the ion-selectivity behavior at steady state.

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