distribution

https://doi.org/10.1351/goldbook.D01811
The apportionment of a solute between two phases. The term
partition
or
extraction
may also be used in this sense where appropriate.
Source:
PAC, 1993, 65, 2373. (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2377 [Terms] [Paper]