Study of the shutting effect of a liquid thermostat during measurements using a two-electrode electrolytic cell

Abstract

A study was made of the component of the error in measuring the resistance of an electrolytic cell with a solution, which is due to the shunting effect of the thermostat liquid. A physical model and equivalent circuits for a cell placed in a thermostat are proposed. The model is based on the example of a two-electrode cell of a common design, which is used for secondary standards of electrolytic conductivity (for solutions with low electrolytic conductivity). For research, computer simulation in the COMSOL Multiphysics software environment was used. The calculated values ​​of the immittance components of computer models of the cell were obtained in the software environment as a result of solving field tasks using the finite element method. The results of the work showed that the values of the investigated component of the relative error can exceed 0.1 % in real measurements of the electrolytic conductivity of solutions using cells of the considered type.