Co-ions

{
  "id": "MLC-T-CHM-002193",
  "term": "Co-ions",
  "field": "Chemistry",
  "definition": "Ions in an electrolyte solution that have the same charge sign as the fixed charges on an ion exchanger or charged surface. These ions are typically excluded from the immediate vicinity of the charged surface due to electrostatic repulsion. In ion exchange chromatography, co-ions are the mobile ions that do not bind to the stationary phase.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "ion",
    "colloidal",
    "relative molecular mass",
    "fixed ions",
    "ion exchanger"
  ],
  "references": [
    "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 (https://doi.org/10.1351/pac197231040577)",
    "Orange Book, 2nd ed., p. 88 (https://media.iupac.org/publications/analytical_compendium/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/co-ions/"
}