Comparative study of methods used for the determination of electroconductivity of ion-exchange membranes

The difference, differential-difference, and mercury-contact ac methods used for determining electroconductivity of ion-exchange membranes of various types in NaCl solutions are analyzed on the basis of the concentration dependence of their electroresistance. The sources of errors in the membrane electroresistivity measurements are analyzed. For each method, sodium chloride concentrations at which the error does not exceed 5% are determined.