Cation and anion exchange on clay modified electrodes

Carbon paste electrodes modified with clay minerals were used for the study of ion-exchange properties of these clay minerals. Cation exchange of Cu(I I) was studied by the dependence on the pH, ionic strength and the form of the minerals. The highest anionic exchange of Hg(II) acetates and chlorides was found on montmorillonites. Anionic exchange of Au(III) chloro complexe s was found on montmorillonite, but their sorption is strongly influenced b y other anions such as chlorides and thiocyanates. The results found are im portant with regard to the study of the anion-exchange properties of clay m inerals.