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Electrodes comprising conducting graphite, paraffin oil pasting liquid, and a rare earth metal impregnated zeolite, such as lanthanum or cerium impregnated mordenite electrodes. Methods and voltammetric applications, such as square wave anodic stripping voltammetry, of these rare earth metal impregnated zeolite modified electrodes for the detection and quantification of heavy metal ions such as Pb(II) and Cd(II) in aqueous solutions.