convex isotherm 

in chromatography
https://doi.org/10.1351/goldbook.CT06937
Distribution isotherm, the slope of which is continuously decreasing.
Note:
The resulting chromatographic peak is tailing. Adsorption isotherms are often of this type. A special case is the Langmuir adsorption isotherm.
Source:
PAC, 1996, 68, 1591. (Nomenclature for non-linear chromatography (IUPAC Recommendations 1996)) on page 1593 [Terms] [Paper]
Citation: 'convex isotherm' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.CT06937 RIS BibTex EndNote
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Last revised: February 24, 2014