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Copper(II)-selective membrane electrodes based on some recently synthesized mixed aza-thioether crowns containing a 1,10-phenanthroline sub-unit |
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| Authors: | Shamsipur M Javanbakht M Mousavi M F Ganjali M R Lippolis V Garau A Tei L |
| Institution: | a Department of Chemistry, Razi University, Kermanshah, Iran b Department of Chemistry, Tarbiat Modarres University, Tehran, Iran c Department of Chemistry, Tehran University, Tehran, Iran d Dipartimento di Chimica Inorganica ed Analitica, Università di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy |
| Abstract: | Three different mixed aza-thioether crowns containing a 1,10-phenanthroline sub-unit were investigated to characterize their abilities as copper(II) ion carriers in PVC-membrane electrodes. The electrode based on L1 exhibited a Nernstian response for Cu2+ ions over a wide concentration range (2×10−1 to 1×10−5 M) with a limit of detection of 8.0×10−6 M (0.5 p.p.m.). The response time of sensor is 15 s, and the membrane can be used for more than 3 months without observing any deviation. The electrode revealed comparatively good selectivities with respect to many alkali, alkaline earth, transition and heavy metal ions, and could be used in a pH range of 2.5–5.5. It was applied to the direct determination and potentiometric titration of the copper(II) ion. |
| Keywords: | Copper ion-selective electrode PVC membrane Mixed aza-thiother crowns Potentiometry |
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