If
and
are the
Gibbs surface concentrations of components
i and 1, respectively, with reference to the same, but arbitrarily chosen,
Gibbs surface, then the relative adsorption of component
i with respect to component 1, is defined as
and is invariant to the location of the
Gibbs surface. Alternatively,
may be regarded as the
Gibbs surface concentration of
when the
Gibbs surface is chosen so that
is zero, i.e. the
Gibbs surface is chosen so that the reference system contains the same amount of component 1 as
the real system. Hence
.
Source:
PAC, 1972, 31, 577
(Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix
II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry)
on page 591
Cite as:
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.
https://doi.org/10.1351/goldbook.
