linear distribution isotherm in chromatography

A distribution isotherm which can be approximated as $c S = K C · c M$ where $K C$ is a constant.

Note:

At low concentrations, all distribution isotherms tend towards being linear. $K C$ is the distribution constant.

Source:

PAC, 1996, 68, 1591 (Nomenclature for non-linear chromatography (IUPAC Recommendations 1996)) on page 1593