fixed ions 

https://doi.org/10.1351/goldbook.F02402
In an ion exchanger, the non-exchangeable ions which have a charge opposite to that of the counter-ions.
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 854 [Terms] [Paper]
Citation: 'fixed ions' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.F02402 RIS BibTex EndNote
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Last revised: February 24, 2014