mass distribution ratio

in chromatography
https://doi.org/10.1351/goldbook.M03718
The fraction (1R) of a component in the stationary phase divided by the fraction (R) in the mobile phase: Dm=amount of substance in the stationary phaseamount of component in the mobile phase This term is recommended in preference to the term capacity factor frequently used in the chromatographic literature.
See also:
extraction factor
Sources:
Orange Book, 2nd ed., p. 107 [Terms] [Book]
PAC, 1993, 65, 2373. (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2384 [Terms] [Paper]