colloid osmotic pressure (Donnan pressure)

https://doi.org/10.1351/goldbook.C01178
The pressure difference which has to be established between a @[email protected] system and its equilibrium liquid to prevent material transfer between the two phases when they are separated by a @[email protected], permeable to all components of the system, except the @[email protected] ones.
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 615 [Terms] [Paper]