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弱酸型离子交换膜的有效交换容量取决于外部溶液的pH值。所以描述该膜性质的参数是膜的真实重量交换容量(Scientific Weight Capacity)和弱酸离子交换基团的pK值。全氟羧酸膜的表观pK值可以从滴定曲线中点的pH值计算。在此使用Helfferich的方法对全氟羧酸膜进行pH滴定,并求出表观pK值。为了验证外部溶液pH值对膜电阻的影响,用交流电导仪测定了在不同pH饱和食盐水中达到平衡的Nafion 901膜的电阻率。
The effective exchange capacity of a weak acid ion exchange membrane depends on the pH of the external solution. The parameters describing the properties of the membrane are the true Weight Weight of the membrane and the pK value of the weak acid ion exchange group. The apparent pK value of the perfluorocarboxylic acid membrane can be calculated from the pH of the midpoint of the titration curve. The perfluorocarboxylic acid membrane was titrated for pH using the method of Helfferich and the apparent pK value was determined. In order to verify the effect of external solution pH on membrane resistance, the resistivity of Nafion 901 membrane, which is equilibrated in different pH saturated saline solutions, was measured using an AC conductivity meter.