Abstract
A highly selective and sensitive Er3+ sensor was constructed with a polyvinyl chloride matrix membrane containing oxalic acid bis[2-[(phenylamino)carbonyl]hydrazide] as a neutral carrier, sodium tetraphenyl borate as a cationic additive and nitrobenzene as a plasticizing solvent mediator. The proposed sensor exhibits linear potential response with a Nernstian slope of 19.7 ± 0.4 mV decade−1 of activity in the Er3+ concentration range of 1.0 × 10−6 to 1.0 × 10−2 mol dm−3 in the pH range of 2.7–10.2. It has a very short response time (<10 s), a detection limit of 5.8 × 10−7 mol dm−3 and good selectivity relative to a wide variety of other metal ions including common alkali, alkaline earth, heavy and transition metal ions. The sensor can be used for at least 2 months without any considerable divergence in potentials. The proposed sensor was successfully applied as an indicator electrode for the potentiometric titration of 1.0 × 10−4 mol dm−3 of Er3+ ions with a 1.0 × 10−2 mol dm−3 EDTA. It was also used in the indirect determination of F− ions in some mouthwash solutions.
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The authors acknowledge the kind financial support provided by the Research Council of Quchan Islamic Azad University and Sama Institution of Quchan branch for the preparation of this study.
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Zamani, H.A., Ganjali, M.R. Fabrication of an Er3+ PVC membrane sensor based on oxalic acid bis[2-[(phenylamino)carbonyl]hydrazide]. Monatsh Chem 141, 1183–1189 (2010). https://doi.org/10.1007/s00706-010-0394-1
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DOI: https://doi.org/10.1007/s00706-010-0394-1