The Relationship Between the Selectivity of Electrodes Based on Polyether Derivatives of o-Phenanthroline and Extraction Constants of Amine Species

Abstract

Abstract: Electrodes based on polyether derivatives of o-phenanthroline were prepared. The potentiometric response characteristics of the electrodes prepared were investigated.The extraction constants K_e of amine species were determined in the presence and absence of polyether derivatives of o-phenanthroline in the organic phase. The relationship between the electrode selectivity and K_e was examined. The benzylamine selective electrode based on polyether derivative of o-phenanthroline showed the following selectivity order: benzylamine >ethylamine>tetraethylammonium>triethylamine>diethylamine>ammonium. This was exactly the extraction constant sequence of the amine species. The PHEN19C7-based electrode was used to determine the Mexiletine content in pharmaceutical preparations with satisfactory results.

Key words: Ion-selective electrode, Polyether derivative of o-phenanthroline, Amine, Ex-traction constant

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ZHANG Zeng-Rong, YU Ru-Qin . The Relationship Between the Selectivity of Electrodes Based on Polyether Derivatives of o-Phenanthroline and Extraction Constants of Amine Species[J]. Chem. J. Chinese Universities, 1994, 15(5): 655.

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The Relationship Between the Selectivity of Electrodes Based on Polyether Derivatives of o-Phenanthroline and Extraction Constants of Amine Species

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