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Zn(II)-selective membrane electrode based on tetra(2-aminophenyl) porphyrin |
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| Authors: | A R Fakhari M Shamsipur Kh Ghanbari |
| Institution: | a Department of Chemistry, Shahid Beheshti University, Tehran, Iran b Department of Chemistry, Razi University, Kermanshah, Iran |
| Abstract: | A new PVC membrane electrode for Zn2+ ions based on tetra(2-aminophenyl) porphyrin (TAPP) as membrane carrier is prepared. The sensor exhibits a linear stable response over a wide concentration range (5.0×10?5 to 1.0×10?1 M) with a slope of 26.5 mV/decade and a limit of detection 3.0×10?5 M (1.96 ppm). It has a response time of about l0 s and can be used for at least 8 months without any divergence in potential. The propose membrane sensor revealed good selectivities for Zn2+ over a wide variety of other metal ions and can be used in pH range of 3.0–6.0. It was successfully applied to the direct determination of zinc in a pharmaceutical sample and also as an indicator electrode in potentiometric titration of Zn2+ ions. |
| Keywords: | Zn2+-selective electrode Sensor Potentiometry Tetra(2-aminophenyl) porphyrin |
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