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transfer activity coefficient, γ t

A term used to quantify the difference in the free energy of a solute ion in two different standard states often in two different liquid phases. The relationship is Δ t G ° = ν R T ln γ t where Δ t G ° is the transfer Gibbs energy and ν is the number of ions in the solute.
  1. It should not be confused with the mass transfer coefficient which represents the specific rate of transfer of a species from one phase to another.
  2. It does not necessarily imply the physical transfer of a solute between two liquid phases.
PAC, 1993, 65, 2373 (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2386
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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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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