Prepared polystyrene pyridine copolymer supported manganese(III) protoporphyrin IX structures (MnPPIX-PSP4) were applied as an ionophore for ion selective electrodes. The responses of the solvent/polymeric membrane based on MnPPIX-PSP4 with standard PVC composition (NPOE as plasticizer: PVC: estimated ionophore in polymer = 132:66:2.6) were measured. The membranes based on MnPPIX-PSP4 exhibited not only excellent selectivity to iodide ion compared to other anions examined, but also Nernstian behavior (58 mV dec(-1)). The optimization of the experimental conditions for potentiometric analysis offers a wide linear dynamic range (10(-1) to 10(-5) M I-), reasonable detection limits(similar to 10(-5) M) and good durability within a limited error. The anion selective solvent/polymeric membranes based on polymer supported metalloporphyrins could overcome the shortcomings of limited life time, due to the loss of ionophores to the solution without effects from the high resistance of membranes. This is the first report that the addition of only around 1% of a polymer-attached ionophore into a plasticized PVC membrane leads to selectivity of salicylate due to the size exclusion effect.