As we know,zeolites have different cation exchange capacities(CEC) and external cation exchange capacities (ECEC) depending totheir structures and Si/Al ratio, which the later case affects on theproperties of the obtained SMz.In addition, presence of bilayer onSMZacts as an organic medium which affects on the hydrophilicityof obtained SMZ.According to the above discussions, we believethat the support on different SMZs has a major role on theiradsorption behavior.Hence we decided to use different SMZs, wereobtained from different zeolites, for modification of the electrodesurface towards potentiometric determination of different anions.