Donnan exclusion

{
  "id": "MLC-T-CHM-003383",
  "term": "Donnan exclusion",
  "field": "Chemistry",
  "definition": "The phenomenon where the concentration of mobile ions inside a charged membrane or gel differs from their concentration in the external solution. This occurs to maintain electroneutrality across the membrane, particularly when fixed charges are present within the membrane matrix. It is a key factor in ion-exchange processes and membrane separation.",
  "subject": "Polymer",
  "see_also": [
    "ion exchange",
    "membrane"
  ],
  "references": [
    "PAC, 1996, 68, 1479. 'Terminology for membranes and membrane processes (IUPAC Recommendations 1996)' on page 1488 (https://doi.org/10.1351/pac199668071479)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/donnan-exclusion/"
}