Development of selective accumulation and quantification method of iodide using silver electrode

Abstract

The aim of this study was to establish a method for the selective recovery and quantification of iodide ions (I^-) from environmental water using electrochemical methods, and to investigate the optimization of measurement conditions and the effects of interfering ions. The method was also applied to actual environmental samples for practical use. First, the applied potential, electrode surface area and reaction time were optimized. A linear relationship was observed between the logarithm of the I^- concentration in solution and the amount of I^- accumulated to the electrode. The interference of Cl^- was also confirmed, while there is no interference of IO₃^-. Furthermore, comparison with HPLC-ICP-MS showed that the I^- concentrations in the actual environmental samples were within the error range, confirming the validity of this method.