concave isotherm

in chromatography
https://doi.org/10.1351/goldbook.CT06938
distribution isotherm, the slope of which is continuously increasing.
Note:
The resulting chromatographic peak is @F02534@. In @G02586@, overloading often results in a concave isotherm.
Source:
PAC, 1996, 68, 1591. 'Nomenclature for non-linear chromatography (IUPAC Recommendations 1996)' on page 1593 (https://doi.org/10.1351/pac199668081591)