The equilibrium relation between the concentration of a sample
component in the stationary phase
, and in the mobile phase
, expressed as a function
The relation can be influenced also by concentrations of
other sample components.
are usually expressed per
unit volume of the phase;
may also be expressed per mass of
the dry solid phase or per unit surface area.
In some versions of chromatography
, a distribution isotherm can be
seen as a partition isotherm
, an adsorption isotherm
, or a combination
of these, depending on the mechanism of separation.
PAC, 1996, 68, 1591
(Nomenclature for non-linear chromatography (IUPAC Recommendations 1996))
on page 1592
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook