【摘要】 本文叙述了电导法测定电解质通过离子交换膜扩散系数的原理、方法,并推导出计算公式。均相离子交换膜的盐扩散系数小于异相膜,含水量少的膜小于含水量多的膜,阴膜小于阳膜。二价金属离子的盐在阴膜中的扩散系数小于一价金属离子的盐。对两种电解质分别测得它们在膜中的扩散系数后,即可算出其分离系数S_A~B 值。更多还原

【Abstract】 The electrolyte diffusion coefficient can be measured when ion-exchangemembranes were fixed in diffuser having two cells with stirring.The elec-trolyte diffusion amour passing through the membrane can be calcutated fromthe change of conductance of the conductivity meter.This method was moreavailable than the chemical analysis method.The measuring principle wasdescribed and the calculating formula was derived in this paper.The salt diffusion cofficient of homogeneous phase membrane and anion-exchange membrane was respectively smaller than that of heterogeneous andcation.For the anion-exchange membrane,the diffusion coefficient of bival-ent metal salt was smaller than that monovalent one.The more the watercontent of ion-membrane,the greater was its diffusion coefficient.The separation facter S_B~A can be calculated affer each of diffusion coeff-icient of electrolyte A and B in the membrane has been measured for thedialysis membranes.更多还原