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Studies on complex formation of tris(3-(2-hydroxybenzophenone)propyl)amine (THPA) with a number of metal ions in acetonitrile solution revealed the occurrence of a selective 1 : 1 complexation of the proposed ligand with Sn 2þ ion. Consequently, THPA was used as a suitable neutral ionophore for the preparation of a polymeric membrane-selective electrode. The electrode exhibits a Nernstian behavior with a slope of 29.4 AE 0.3 mV per decade and a detection limit of 2.0 Â 10 À7 M. It also showed a good selectivity for Sn 2þ ions in comparison with some of group A and B metal ions over a wide concentration range of 5.0 Â 10 À7 -1.0 Â 10 À1 M. Improved selectivity was achieved compared to the best selectivity recently reported by other authors for tin(II). The electrode was successfully applied to the determination of Sn 2þ ion in waste water and various canned products.

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