Electrooxidation of Iodide in the Presence of 4-Hydroxycoumarin: Application to a Simple Coulometric Titration of 4-Hydroxycoumarin

抄録

The electrochemical oxidation of iodide ion in the presence of 4-hydroxycoumarin (1) was studied using cyclic voltammetry and controlled-potential coulometry. The result indicates that the resulting iodine takes part in a halogenation reaction and reacts with 4-hydroxycoumarin (1). According to the obtained results, a new and simple coulometric titration method with potentiometric end-point detection for the determination of 4-hydroxycoumarin (1) is presented. In the presented method, 2 - 200 μmol of 4-hydroxycoumarin (1) was successfully determined.