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A Highly Selective and Sensitive Thorium(IV) PVC Membrane Electrode Based on a Dithio-tetraaza Macrocyclic Compound

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Abstract

A poly(vinyl chloride)-based membrane composed of dithio-tetraaza macrocyclic compound as a neutral carrier with sodium tetraphenylborate (NaTPB) as an anion excluder and nitrobenzene (NB) as plasticizer was prepared and investigated as a Th(IV)-selective electrode. The electrode exhibits a Nernstian slope of 14.2 ± 0.3 mV per decade over a wide concentration range (1.0 × 10-6 to 1.0 × 10-1 M) with a detection limit of 8.0 × 10-7 M between pH 3.5 and 9.5. The response time of the sensor is about 10 s and it can be used over a period of 5 months without any divergence in potential. The proposed membrane sensor revealed a good selectivity for Th(IV) over a wide variety of other metal ions and proved to be a better electrode in many respects than those reported in the literature. It was successfully applied as an electrode indicator as well as in the direct determination of thorium ions in standard and real samples.

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Authors and Affiliations

  1. Department of Chemistry, Zakir Husain College (University of Delhi), J.L. Nehru Marg, New Delhi, 110 002, India

    Sulekh Chandra, Himanshu Agarwal & Chandan Kumar Singh

Authors
  1. Sulekh Chandra
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  2. Himanshu Agarwal
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  3. Chandan Kumar Singh
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Correspondence to Sulekh Chandra.

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Chandra, S., Agarwal, H. & Singh, C.K. A Highly Selective and Sensitive Thorium(IV) PVC Membrane Electrode Based on a Dithio-tetraaza Macrocyclic Compound. ANAL. SCI. 23, 469–473 (2007). https://doi.org/10.2116/analsci.23.469

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  • DOI: https://doi.org/10.2116/analsci.23.469

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