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surement conditions using the same plasticizer in all membranes. In addition, comparison is made with a 14-crown-4 ether neutral carrier as reported by Kitazawa et al. (5).Cation complexing properties of a large number of macrocyclic polyether-diester compounds have also been reported (6-19). These compounds generally form weaker complexes than the cyclic polyethers. They have been reported to show significant affinities for alkali, alkaline-earth, and primary alkylammonium cations (12,13,15,16,19). Gadzekpo et al. have reviewed the literature of lithium sensors (20). EXPERIMENTAL SECTION Reagents and Chemicals. High molecular weight poly(vinyl chloride) (PVC) was obtained from Fluka AG. Tris(2-ethylhexyl) phosphate was obtained by U. C. C. Flexoh. All solutions were

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