Specimen

{
  "id": "MLC-T-CHM-011117",
  "term": "Specimen",
  "field": "Chemistry",
  "definition": "A portion deliberately drawn from a changing system, such as a flowing stream or a blood draw, that is taken to stand for the parent material at the moment of collection. It is tied to a point in time and cannot be taken again, so its sampling error cannot be separated from the error in the property being estimated. It can be treated as a special kind of sample that varies over time rather than over position.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "sampling error"
  ],
  "references": [
    "PAC, 1990, 62, 1193. 'Nomenclature for sampling in analytical chemistry (Recommendations 1990)' on page 1202 (https://doi.org/10.1351/pac199062061193)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/specimen/"
}