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Abstract: Polymeric ionophores have been prepared by the copolymerization of styrenic monomers with metal ion complexes possessing polymerizable ligands. The polymers were ground to a fine mesh and the accessible metal ions were removed by acid washing to leave cavities templated for specific metal ions. The polymers were tested and characterized for metal ion sequestering. Polymers were sieved and various uniform particle sizes were incorporated in polyvinyl chloride (PVC) membranes and used as ion-selective electrodes. Electrodes prepared from untemplated polymers, unpolymerized complex and free ligand were also constructed and tested. The templated polymers were superior to other the forms in the electrodes. Fluorescent metal ion complexing agents are now being used to develop metal ion-templated polymers to serve as sensing elements for optical devices. Sensitivity based on fluorometric detection coupled with the chemical selectivity of a templated polymeric film results in a large dynamic range of measurement and low limit of detection