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在隔开两个盐溶液的离子交换膜中所发生的迁移过程,人们是很感兴趣的。而离子交换膜中的扩散系数和依附在交换膜表面的液膜厚度,则是研究这种迁移过程的最重要的参数。 当用一离子交换膜将两个组成相同而其中之一用示踪原子标记的稀溶液隔开时,将发生同位素扩散穿过此离子交换膜的现象。因为该体系处于平衡状态,所以不存在活度系数、电势和压力等的梯度,也没有对流现象发生。随着时间增加,起始为非放射性的溶液中出现放射性,并且放射性强度不断上升。
It is of great interest that the migration process takes place in an ion exchange membrane separating the two salt solutions. However, the diffusion coefficient in the ion exchange membrane and the thickness of the liquid film attached to the surface of the exchange membrane are the most important parameters for studying the migration process. The phenomenon of isotopically diffusing through this ion exchange membrane occurs when two ion exchange membranes are made identical and one of them separated by a dilute solution labeled with a tracer atom. Because the system is in equilibrium, there are no gradients of activity coefficients, potentials, pressures, etc., and no convection occurs. As time increases, radioactivity begins in the non-radioactive solution and the radioactivity intensity increases.