sorption isotherm

in ion exchange
https://doi.org/10.1351/goldbook.S05770
The concentration of a sorbed species in the @I03171@, expressed as a function of its concentration in the external solution under specified conditions and at constant temperature.
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 854 [Terms] [Paper]