Ilani A
Isr J Med Sci. 1982 Jan;18(1):9-12.
When solute particles are distributed inhomogeneously in a solution due to the action of an external force, the pressure difference across a semipermeable membrane is determined by the concentration of the impermeant particles in the immediate vicinity of the membrane. In line with this conclusion, it is shown that in a Donnan system containing a porous membrane, the concentration of the impermeant polyelectrolyte at the membrane interface is equal to the difference between the osmolar concentrations of the solutions present on the two sides of the membrane. That is, the impermeant species are accumulated at the membrane interface in proportion to their density in the solution. The well-known effect of the concentration of the permeant ions on the equilibrium pressure difference in Donnan systems is related to the influence of the ionic strength on the extent of accumulation of the impermeant electrolyte at the membrane interface. Predictions derived from these theoretical considerations were verified experimentally.
当溶质粒子在外力作用下在溶液中分布不均匀时，半透膜两侧的压力差由膜附近非渗透粒子的浓度决定。根据这一结论，结果表明，在含有多孔膜的唐南系统中，膜界面处非渗透聚电解质的浓度等于膜两侧溶液渗透浓度之差。也就是说，非渗透物质在膜界面处的积累与其在溶液中的密度成正比。唐南系统中渗透离子浓度对平衡压力差的著名影响与离子强度对非渗透电解质在膜界面处积累程度的影响有关。从这些理论考虑得出的预测通过实验得到了验证。
