Surface excess concentration

{
  "id": "MLC-T-CHM-011641",
  "term": "Surface excess concentration",
  "field": "Chemistry",
  "definition": "The amount of a specific component present at an interface, beyond what would be expected if the bulk concentrations extended uniformly to a chosen dividing surface. This value indicates the accumulation or depletion of a substance at the boundary between two phases. It is typically expressed in units of moles per unit area.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "adsorption",
    "dividing surface",
    "interface",
    "surface excess"
  ],
  "references": [
    "Green Book, 2nd ed., p. 63 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)",
    "PAC, 1986, 58, 967. 'Reporting data on adsorption from solution at the solid/solution interface (Recommendations 1986)' on page 970 (https://doi.org/10.1351/pac198658070967)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/surface-excess-concentration/"
}