Abstract
A Th4+ ion-selective membrane sensor was fabricated from poly (vinyl chloride) (PVC) matrix membrane containing 2-(diphenylphosphorothioyl)-N′,N′-diphenyl acetamide (DPTD) as a neutral carrier, potassium tetrakis (p-chlorophenyl) borate (KTpClPB) 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 sensor, comprising 30% PVC, 63% solvent mediator, 4% ionophore and 3% anionic additive demonstrates the best potentiometric response characteristics. It displays Nernstian behavior (15.2 ± 0.5 mV per decade) over the concentration range 1.0 × 10−2–1.0 × 10−6 M. The detection limit of the electrode is 6.3 × 10−7 M (∼140 ng/ml). The response time of the electrode is 30 s .The sensor can be used in the pH range 3.0–9.0 for about 6 weeks. The membrane sensor was used as an indicator electrode in the potentiometric titration of Th4+ ions with EDTA. It was successfully applied to the determination of thorium ions in binary mixture.
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The authors express their appreciation to the Research Council of the University of Tehran for financial support of this work.
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Ganjali, M.R., Norouzi, P., Faridbod, F. et al. Highly selective and sensitive Th4+-PVC-based membrane sensor based on 2-(diphenylphosphorothioyl)-N′,N′-diphenylacetamide. J Appl Electrochem 37, 827–833 (2007). https://doi.org/10.1007/s10800-007-9318-0
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DOI: https://doi.org/10.1007/s10800-007-9318-0