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Highly selective and sensitive Th4+-PVC-based membrane sensor based on 2-(diphenylphosphorothioyl)-N′,N′-diphenylacetamide

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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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Acknowledgement

The authors express their appreciation to the Research Council of the University of Tehran for financial support of this work.

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Author notes

  1. M. R. Ganjali & P. Norouzi

    Present address: Endocrine & Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran

Authors and Affiliations

  1. Center of Excellence in Electrochemistry (CEE), Faculty of Chemistry, University of Tehran, Tehran, Iran

    M. R. Ganjali, P. Norouzi & F. Faridbod

  2. Department of Chemistry, Yasouj University, Yasouj, Iran

    S. Riahi

  3. Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, Iran

    M. R. Yaftian & A. Zamani

  4. Ehics, Chim Minerale & Analyt Lab, CNRS URA 405, 1RUE Blaise Pascal, Strasbourg, 67008, France

    D. Matt

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  1. M. R. Ganjali
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  4. S. Riahi
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  7. D. Matt
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Correspondence to M. R. Ganjali.

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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

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