Ion‐Exchange Voltammetry of Cationic Species at Membrane Clay‐Modified Electrodes

Membrane glassy carbon electrodes modified with clay (laponite, montmorillonite, beidellite under a commercial drug form) suspensions, entrapped between a dialysis membrane and the carbon surface, were used in the ion-exchange voltammetry of methylviologen MV2+ and cationic complex Cu(NH3)42+. Various parameters (concentration of the clay suspension, pH, stability, limit of detection) were investigated. This study has been extended to other metal cations of environmental interest. The feasibility of such suspension-modified electrodes for an approach to the analytical investigation of delaminated clays is underlined.