04187 IUPAC Gold Book - non-crystalline electrodes 10.1351/goldbook.N04187 N04187 current 1 Electrodes in which a support matrix, containing an ion exchanger (either cationic or anionic), a plasticizer solvent, and possibly an uncharged, selectivity-enhancing species, forms the ion-selective membrane which is usually interposed between two aqueous solutions. The support used can be either macroporous [e.g. poly(propylene carbonate) filter, glass frit, etc.] or microporous (e.g. 'thirsty' glass or inert polymeric material such as PVC) yielding with the ion-exchanger and the solvent a 'solidified' homogeneous mixture. These electrodes exhibit a response due to the presence of the ion-exchange material in the membrane. The solvent-polymeric-membrane is an example. filter https://goldbook.iupac.org//terms/view/F02384 inert https://goldbook.iupac.org//terms/view/I03026 ion exchanger https://goldbook.iupac.org//terms/view/I03171 membrane https://goldbook.iupac.org//terms/view/MT06878 polymeric https://goldbook.iupac.org//terms/view/M03667 selectivity https://goldbook.iupac.org//terms/view/S05563 PAC, 1994, 66, 2527. 'Recommendations for nomenclature of ionselective electrodes (IUPAC Recommendations 1994)' on page 2534 (https://doi.org/10.1351/pac199466122527) https://goldbook.iupac.org/terms/view/N04187/html https://goldbook.iupac.org/terms/view/N04187/json https://goldbook.iupac.org/terms/view/N04187/plain Citation: 'non-crystalline electrodes' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.N04187 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-12T05:42:51+00:00