Excitation frequency dependence of conductivity of electrolytic solutions.

Abstract

The frequency dependence of the electrolytic conductivity was studied for solutions of varying concentrations of NaCl, MgS04, KC1, and KBr. An experimental test fixture was designed and an equivalent electrical model of the test system developed. A theoretical model of the conductivity that accounts for charge carrier inert: a is proposed. Measured values of the impedance at various frequencies were used to generate test system model parameters, and subsequently identify sample response. Interpretation of the sample response using the conductivity model allowed determination of the conductivity, which is presented in the form of the D.C. value or real part, Ko and the nondielectric time constant, Tc. The conductivity of the solutions decreased with increasing frequency and the initial measurements of Tc were of the order of nanoseconds. Variations in K with salinity were in agreement with the empirical formula of Walden.