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Electroanalytical performance of a terbium(III)-selective sensor based on a neutral ionophore in environmental and medicinal samples

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Abstract

A new highly selective terbium(III) electrode was prepared with a polymeric film doped using S-2-benzothiazolyl-2-amino-α-(methoxyimino)-4-thiazolethiol acetate as an electroactive material, benzyl acetate (BA) as a plasticizer, and potassium tetrakis(4-chlorophenyl) borate (KTpClPB) as an anionic site in the percentage ratio 3.17:1.58:63.4:31.7 (ionophore-KTpClPB-BA-PVC, w/w). The electrode exhibited a linear response with a near Nernstian slope of 19.5 mV/decade within the concentration range 1.5 × 10−7−1.0 × 10−2 M terbium ions, with a working pH range from 2.0 to 8.0, and a fast response time of 10 s and presented satisfactory reproducibility. The limit of detection was 9.3 × 10−8 M. The results show that this electrode can be used in ethanol media up to 30% (v/v) concentration without interference. It can be used for 3 months without any considerable divergence in the potentials. Selectivity coefficients for terbium(III) with respect to many cations were investigated. The electrode is highly selective for terbium(III) ions over a large number of monovalent, bivalent, and trivalent cations. This shows the valuable property of the proposed electrode. The stability constant of the ionophore towards Tb3+ ions was determined with the sandwich membrane method. It was successfully used as an indicator electrode in potentiometric determination of terbium(III) ions with EDTA and in direct determination in tap water and binary mixtures with quantitative results. The utility of the proposed electrode was also determined in the presence of ionic and nonionic surfactants and in the presence of fluoride ions in four pharmaceutical (mouthwash) preparations.

Structure of S-2-Benzothiazolyl-2-amino-α-(methoxyimino)-4-thiazolethiol acetate

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Acknowledgement

B.G. gratefully acknowledges the Ministry of Human Resource Development (MHRD), New Delhi, India, for financial support.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee, 247667, India

    V. K. Gupta, A. K. Singh & Barkha Gupta

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  1. V. K. Gupta
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  2. A. K. Singh
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  3. Barkha Gupta
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Correspondence to V. K. Gupta.

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Gupta, V.K., Singh, A.K. & Gupta, B. Electroanalytical performance of a terbium(III)-selective sensor based on a neutral ionophore in environmental and medicinal samples. Anal Bioanal Chem 390, 2171–2181 (2008). https://doi.org/10.1007/s00216-008-1936-9

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  • DOI: https://doi.org/10.1007/s00216-008-1936-9

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