Standard

{
  "id": "MLC-T-CHM-013592",
  "term": "Standard",
  "field": "Chemistry",
  "definition": "A reference material or established criterion used for comparison, measurement, or to define a level of quality or performance. In chemistry, a standard solution has a precisely known concentration and is used to calibrate instruments or determine unknown concentrations. Environmental quality standards set limits for pollutants in air or water.",
  "synonyms": [
    "technical directive"
  ],
  "subject": "Chemistry and Human Health",
  "see_also": [
    "environmental quality standard",
    "community"
  ],
  "references": [
    "PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 949 (https://doi.org/10.1351/PAC-REC-08-07-09)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/standard/"
}