Fabrication of an iron(III)-selective PVC membrane sensor based on a bis-bidentate Schiff base ionophore |
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Authors: | Hassan Ali Zamani Mohammad Reza Ganjali Masoud Salavati-Niasari |
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Institution: | (1) Young Researchers Club, Quchan Branch, Islamic Azad University, Quchan, Iran;(2) Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran;(3) Endocrine & Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran;(4) Department of Chemistry, Faculty of Science, University of Kashan, Kashan, Iran |
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Abstract: | A Fe3+ ion-selective membrane sensor was fabricated from polyvinyl chloride (PVC) matrix membrane containing bis-bidentate Schiff
base (BBS) as a neutral carrier, sodium tetraphenyl borate (NaTPB) as anionic excluder, and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The effects of the membrane composition, pH, and additive
anionic influence on the response properties were investigated. The best performance was obtained with a membrane containing
32% PVC, 62.5% NPOE, 3% BBS, and 2.5% NaTPB. The electrode shows a Nernstian behavior (slope of 19.3 ± 0.6) over a very wide
iron ion concentration range (1.0 × 10−7–1.0 × 10−2 M) and has a low detection limit (7.4 × 10−8 M). The potentiometric response of the sensor is independent of pH of the solution in the pH range 1.9–5.1. The proposed
sensor has a very low response time (<15 s) and a good selectivity relative to a wide variety of other metal ions including
common alkali, alkaline earth, heavy, and transition metal ions. The electrode can be used for at least 60 days without any
considerable divergence in potentials. The proposed sensor was successfully applied as an indicator electrode for the potentiometric
titration of 1.0 × 10−2 M Fe3+ ions with a 1.0 × 10−4 M EDTA and the direct determination of Fe3+ in mineral water and wastewater samples. |
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