1968 Volume 34 Issue 5 Pages 404-407
In the previous papers6, 7), the authors studied on the transport of water In the water-cephalin-membrane-salt solution system. In the present paper, the sucrose solution-cephalin-membrane-salt solution system was studied by measuring the transport of water. The results obtained were as follows:
The total system was composed of a set of two solutions, a sucrose solution as well as
a solution of salts such as K-chloride, K-suIfate, and K-citrate, contacting with each other through a cephalin-membrane. The transport of water across the membrane was measured on various set of the two solutions at concentration varying independently over the range from M/1024 to M/2. Most of osmotic flow occurred from the sucrose side to the salt side and in the most cases the flow went to the opposite direction as is expected from a normal osmosis which takes place by the concentration difference (Fig. 1, 2, 3).
It is suggested that the ionic selectivity of the negatively charged cephalin-membrane renders the cations larger permeation velocity than the anions, and thus occurrence of a diffusion potential between the sucrose and salt solutions produces an electroosmosis across the membrane.
Since direction of flow across the membrane was opposite to that was expected from the normal osmosis, it seems that both normal osmosis and the electroosmosis overlap one another in the present results.
