Sub-micro level monitoring of beryllium ions with a novel beryllium sensor based on 2,6-diphenyl-4-benzo-9-crown-3-pyridine |
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Authors: | Ganjali Mohammad Reza Rahimi-Nasrabadi Mehdi Maddah Bozorgmehr Moghimi Abolghasem Faal-Rastegar Madjid Borhany Shahin Namazian Mansour |
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Institution: | a Department of Chemistry, Tehran University, P.O. Box 14155 6455, Tehran, Iran b Department of Chemistry, Amirkabir University, Tehran, Iran c Department of Chemistry, ImmamHossein University, Tehran, Iran d Department of Chemistry, Yazd University, Yazd, Iran |
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Abstract: | The 2,6-diphenyl-4-benzo-9-crown-3-pyridine (DPCP) was used as an excellent ionophore in construction of a coated graphite poly(vinyl chloride) (PVC)-based membrane sensor. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 60% o-nitrophenyloctyl ether (NPOE), 5% 2,6-diphenyl-4-benzo-9-crown-3-pyridine and 5% sodium tetraphenyl borate (TBP). This sensor shows very good selectivity and sensitivity towards beryllium ion over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a great enhancement in selectivity coefficients and sensitivity for beryllium, in comparison with the previously reported beryllium electrodes. The electrode exhibits a Nernstian behavior (with slope of 29.6 mV per decade) over a very wide concentration range (1.0×10−7 to 1.0×10−1) with a detection limit of 4.0×10−8 M (360 pg ml−1). It shows relatively fast response time, in whole concentration range (<10 s), and can be used for at least 12 weeks in the pH range of 4.5-8.0. The proposed sensor was successfully used to determination of beryllium in mineral ore. |
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Keywords: | 2 6-Diphenyl-4-benzo-9-crown-3-pyridine Beryllium sensor Potentiometry PVC Graphite |
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