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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3009
Title: Electroanalytical performance of a terbium(III)-selective sensor based on a neutral ionophore in environmental and medicinal samples
Authors: Gupta V.K.
Singh A.K.
Gupta B.
Published in: Analytical and Bioanalytical Chemistry
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. © 2008 Springer-Verlag.
Citation: Analytical and Bioanalytical Chemistry (2008), 390(8): 2171-2181
URI: https://doi.org/10.1007/s00216-008-1936-9
http://repository.iitr.ac.in/handle/123456789/3009
Issue Date: 2008
Keywords: Ion-selective electrodes
Neutral ionophore
Potentiometry
Stability constant
Terbium
ISSN: 16182642
Author Scopus IDs: 7403420647
57209223382
7402195167
Author Affiliations: Gupta, V.K., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India
Singh, A.K., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India
Gupta, B., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India
Funding Details: Acknowledgement B.G. gratefully acknowledges the Ministry of Human Resource Development (MHRD), New Delhi, India, for financial support.
Corresponding Author: Gupta, V. K.; Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India; email: vinodfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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