Concentration in experimental surface

{
  "id": "MLC-T-CHM-002362",
  "term": "Concentration in experimental surface",
  "field": "Chemistry",
  "definition": "The amount of a component of interest in the region sampled by a surface-sensitive technique, divided by the total amount of all substances in that same volume, and expressed as an atomic fraction such as ppma or as a mass fraction such as micrograms per gram. Because the analysed volume is the shallow region probed by the technique, the value can differ from the bulk concentration, for instance in a segregated or oxidised surface layer.",
  "synonyms": [
    "surface concentration"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "weight"
  ],
  "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/concentration-in-experimental-surface/"
}