linear distribution isotherm

in chromatography
https://doi.org/10.1351/goldbook.LT06935
A distribution isotherm which can be approximated as cS = KC.cM where KC is a constant.
Note:
At low concentrations, all @DT06932-2@ tend towards being linear. KC is the @D01813@.
Source:
PAC, 1996, 68, 1591. 'Nomenclature for non-linear chromatography (IUPAC Recommendations 1996)' on page 1593 (https://doi.org/10.1351/pac199668081591)