Novel Ag ion-selective electrodes based on two new mixed azathioether crowns containing a 1,10-phenanthroline sub-unit |
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Authors: | Mojtaba Shamsipur Mehran JavanbakhtVito Lippolis Alessandra GarauGreta De Filippo Mohammad Reza GanjaliAbdullah Yari |
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Affiliation: | a Department of Chemistry, Razi University, Kermanshah, Iran b Department of Chemistry, Tarbiat Modarres University, Tehran, Iran c Dipartimento di Chimica Inorganica ed Analitica, Universita di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy d Department of Chemistry, Tehran University, Tehran, Iran |
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Abstract: | Novel polymeric membrane (PME) and coated graphite (CGE) silver-selective electrodes based on two recently synthesized mixed azathioether crowns containing a 1,10-phenanthroline sub-unit were prepared. The electrodes reveal a Nernstian behavior over quite wide Ag+ ion concentration ranges with a very low limits of detection (LOD) (i.e. down to 1.0×10−8 M for CGEs and 8.0×10−7 M for PMEs). The potentiometric responses are independent of the pH of the test solution in the pH range 3.0-7.0. The electrodes possess advantages of low resistance, very fast response time, relatively long lifetimes and, especially, good selectivities relative to a wide variety of other cations. The electrodes were used, as indicator electrodes, in the potentiometric titration of silver ion and in the determination of Ag+ in waste water, photographic emulsion and radiographic and photographic films. |
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Keywords: | Silver-selective electrodes PVC membrane Coated graphite Mixed azathioether crowns Potentiometry |
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