Trace element

{
  "id": "MLC-T-CHM-012186",
  "term": "Trace element",
  "field": "Chemistry",
  "definition": "An element present in a sample at a very low concentration, insufficient to be considered a major or minor constituent of the matrix. The concentration is typically below 100 parts per million (ppm) or 100 micrograms per gram. The precise concentration threshold distinguishing a trace element from a minor element is not universally fixed and depends on the context of the analysis and the sample matrix.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 1979, 51, 2243. 'General aspects of trace analytical methods - IV. Recommendations for nomenclature, standard procedures and reporting of experimental data for surface analysis techniques' on page 2246 (https://doi.org/10.1351/pac197951112243)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/trace-element/"
}