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.
In the present work a novel potentiometric sensor, based on a noncovalent imprinted polymer, was developed for determination of Lamotrigine (LTG). At optimized conditions the electrode exhibited a Nernstian response (30.8 AE 1.0 mV decade À1 ) in a concentration range of 1 10 À6 to 1 10 À3 M with a detection limit of 8 10 À7 mol L
À1. The potential response of the electrode was constant in the pH range of 1.0-5.0. The electrode demonstrated a response time of~30 s. The selectivity coefficient of the sensor toward a number of different drugs with molecular similarities and some metal ions was evaluated. The electrode was examined for determination of LTG in real samples.
In this study a chelating fiber containing iminodiacetic acid was prepared via the stepwise modification of acrylic fibers, polyacrylonitrile. The resulting modified fiber has been characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, and scanning electron microscopy. Then polyacrylonitrile-iminodiacetic acid was applied for preconcentration and determination of trace Nd(III) ion from human biological fluid and environmental water samples with inductively coupled plasma -atomic emission spectroscopy. The optimum pH value for sorption of the metal ion was 6. The sorption capacity of functionalized resin is 8.9 mg g À1 . A recovery of 100% was obtained with preconcentration factor 10 for the Nd(III) with 0.5 M nitric acid as eluting agent. The profile of Nd(III) uptake on this sorbent reflects good accessibility of the chelating sites in the modified polyacrylonitrile. Scatchard analysis revealed that the homogeneous binding sites were formed in the polymers. The equilibrium adsorption data of Nd(III) on modified fiber were analyzed by Langmuir models.
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