Effect of the Erythrosine Dye on the Electrical Conductivity of Internal Electrolyte for Long-Term Performance of Ag/AgCI Electrode

The Ag/AgCI electrode has been widely used as a reference electrode in electrochemical applications. As the potential of an Ag/AgCI electrode depend on the activity of CI- ions in the electrode, it could cause a considerable potential shift of the electrode when the electrode is immersed in a solution for a long period of time. For this reason, many technologies have been developed for the long-term performance of the reference electrode. This work aims to compare dilution rate of erythrosine dye and KCI internal electrolyte, when the internal electrolyte of the electrode is diluted by a long-term exposure in very dilute solutions. The relationship between the dilution rates of erythrosine dye and CI- ions was expected to be important to improve the long-term performance of the Ag/AgCI electrode. Before the study on the relationship, it should be confirmed the basic performance of erythrosine dye as a spectrally-active material of the Ag/AgCI electrode. Therefore, we investigated the effect of the erythrosine dye on the electrical conductivity and the effect of KCI concentration on the UV/VIS absorbance of erythrosine dye