Quantitative Analysis of Holmium Ion by a Ho3+ Ion‐Selective Sensor Based on a Symmetric Thio‐Schiff's Base |
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| Authors: | Hassan Ali Zamani Rahimi Fatemeh Naghavi‐Reyabbi Fatemeh Arvinfar Ali Imani Alihossien Reza Ganjali Mohammad Faridbod Farnoush Salavati‐Niasari Masoud |
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| Affiliation: | 1. Department of Applied Chemistry, Quchan Branch, Islamic Azad University, Quchan, Iran;2. Resident of General Surgery, Endoscopic & Minimaly Invasive Surgery Research Center, Ghaem Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran;3. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran;4. Department of Chemistry, Faculty of Science, University of Kashan, Kashan, Iran |
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| Abstract: | A poly(vinyl chloride) (PVC) membrane sensor for holmium ions was fabricated based on N‐[(Z)‐1‐(2‐thienyl)‐ methylidene]‐N‐[4‐(4‐{[(Z)‐1‐(2‐thienyl)methylidene]amino} phenoxy)phenyl] amine (TPA) as a new ion carrier, acetophenon (AP) as plasticizing solvent mediator and sodium tetraphenyl borate (NaTPB) as an anion excluder. The electrode shows a good selectivity towards Ho3+ ions respect to other inorganic cations, including alkali, alkaline earth, transition and heavy metal ions. The constructed sensor displays a Nernstian behavior (19.5±0.3 mV/decade) over the concentration range of 1.0×10−6 to 1.0×10−2 mol·L−1 with the detection limit of the electrode being 4.6×10−7 mol·L−1 and very short response time (ca. 5 s). It has a useful working pH range of 3.2–9.8 for at least 8 weeks. The electrode was successfully applied as an indicator electrode for the potentiometric titration of a Ho3+ solution with EDTA and holmium determination in some alloys. The proposed sensor accuracy was studied by the determination of Ho3+ in mixtures of three different ions. |
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| Keywords: | holmium ion PVC membrane sensor potentiometry Schiff's base ion‐selective electrode |
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