Automated Conductometry Measurements of Simple Electrolytes and Micellar Solutions Using a Voltage Divider Technique

A new automated technique was developed for online monitoring of the conductance of a conductive type of cell. Shining metal electrodes were used for the conductometry measurements and the frequency of the input signal was swept from a few hertz to 1 MHz. A theoretical model was developed based on the voltage dividing technique. The model was in good agreement with the experimental results. Conductances of simple electrolytes such as HCl and micellar solutions were compared. Solutions of HCl with concentrations as low as 45 μmol⋅L⁻¹ were investigated. Critical micellar concentrations of two types of micelles, SDS and CPC, were also measured. It was shown that this voltage divider circuit can be used for automated online conductometric titrations.