concentration distribution ratio, Dc 

in chromatography
https://doi.org/10.1351/goldbook.C01225
The ratio of the analytical concentration of a component in the stationary phase to its analytical concentration in the mobile phase. Dc=amount of component/cm3of stationary phaseamount of component/cm3of mobile phase
Source:
Orange Book, 2nd ed., p. 106 [Terms] [Book]