Occlusion

{
  "id": "MLC-T-CHM-008180",
  "term": "Occlusion",
  "field": "Chemistry",
  "definition": "The process by which impurities are trapped within a growing crystal lattice during precipitation from a solution. These impurities are not chemically bound but are physically enclosed within the crystal structure. Occlusion differs from adsorption, where impurities are held on the surface of the precipitate.",
  "synonyms": [
    "molecular occlusion"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "precipitation"
  ],
  "references": [
    "Orange Book, 2nd ed., p. 85 (https://media.iupac.org/publications/analytical_compendium/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/occlusion/"
}