Electrical Conductivity Measurement of Electrolyte Solution

Methods for measuring and analyzing the electrical conductivity of electrolyte solutions are reviewed. The accuracy of conductivity measurements, which have been around for more than 100 years, depends on the physical properties related to ionic conductivity, especially the concentration of the reference material, the electrical signal at the time of measurement, and the temperature, each of which has been redefined each time according to changes in definitions and standards. This article summarizes elemental factors in electrical conductivity measurement, including the concentration and traceability of potassium chloride as a reference material, the history of the bridge method and types of measuring cells, and important notes and recent topics regarding the concept of temperature dependence.