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Abstract.We describe new ion-selective electrodes for piribedil (PD) based on Bi(III)-iodide or Hg(II)-iodide piribedil ion associate complexes in a poly(vinyl chloride) (PVC) membrane with dibutylphthalate (DBP) and dioctylphthalate (DOP) as plasticizing solvent mediator. The electrodes (PD-[BiI4]/DBP, PD-[BiI4]/DOP, PD-[HgI4]/DBP and PD-[HgI4]/DOP) show nearly Nernstian response over the concentration...