What factors influence the partition factors across a membrane for a chemical species? Wikipedia defines the partition coefficient as:
In the physical sciences, a partition-coefficient (P) or distribution-coefficient (D) is the ratio of concentrations of a compound in a mixture of two immiscible phases at equilibrium.
If we let these "two immiscible phases" be either side of the membrane, In this situation the equilibrium concentrations would be determined by the solution either side of the membrane? If there is water either side of the membrane would they have a P of 1?
I'm not a chemist (or biologist for that matter) so apologies for any misuse of terminology or ambiguity.