counter-ions 

https://doi.org/10.1351/goldbook.C01371
  1. (in an ion exchanger) The mobile exchangeable ions.
    Source:
    PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 854 [Terms] [Paper]
  2. (in colloid chemistry) Ions of low relative molecular mass, with a charge opposite to that of the colloidal ion.
    Source:
    PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 607 [Terms] [Paper]
Citation: 'counter-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.C01371 RIS BibTex EndNote
Div. IDiv. VPDFTextXMLJSON
Last revised: February 24, 2014