Evaluating method of the ion-exchange membrane is discussed under the consideration of the industrial application of the membrane.
As basic properties of the ion-exchange membrane, such as ion permselectivity and electric conductivity, are closely related with the structure of charged resin material of the membrane, contributions of fixed ion concentration A to the membrane properties are discussed firstly.
Transport number, diffusion coefficient, electrosmotic and osmotic transport of water and electric resistance are fundamental properties not only for the evaluation of the basic characteristics of individual membrane but also for the design or the evaluation of the electrodialysis process. Measurement procedures of properties mentioned above are explained briefly and typical examples of the properties of the ion-exchnge membrane are discussed. Besides fundamental properties, special properties which are directly related with individual application are also important for the evaluation of the membrane. Among these properties, uni-valent ion permselectivity and anti-fouling properties are discussed in connection with the measurement and the evaluating method of the membrane.
Finally, evaluating method of the anion-exchange membrane, which is especially prepared for the dialysis process, is discussed.
