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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4147
Title: Tripodal chelating ligand-based sensor for selective determination of Zn(II) in biological and environmental samples
Authors: Singh A.K.
Mehtab S.
Singh U.P.
Aggarwal V.
Published in: Analytical and Bioanalytical Chemistry
Abstract: Potassium hydrotris(N-tert-butyl-2-thioimidazolyl)borate [KTt t-Bu] and potassium hydrotris(3-tert-butyl-5-isopropyl-l-pyrazolyl) borate [KTpt-Bu,i-Pr] have been synthesized and evaluated as ionophores for preparation of a poly(vinyl chloride) (PVC) membrane sensor for Zn(II) ions. The effect of different plasticizers, viz. benzyl acetate (BA), dioctyl phthalate (DOP), dibutyl phthalate (DBP), tributyl phosphate (TBP), and o-nitrophenyl octyl ether (o-NPOE), and the anion excluders sodium tetraphenylborate (NaTPB), potassium tetrakis(p-chlorophenyl)borate (KTpClPB), and oleic acid (OA) were studied to improve the performance of the membrane sensor. The best performance was obtained from a sensor with a of [KTt t-Bu] membrane of composition (mg): [KTtt-Bu] (15), PVC (150), DBP (275), and NaTPB (4). This sensor had a Nernstian response (slope, 29.4∈±∈0.2 mV decade of activity) for Zn2+ ions over a wide concentration range (1.4∈×∈10-7 to 1.0∈×∈10-1 mol L-1) with a limit of detection of 9.5∈×∈10-8 mol L-1. It had a relatively fast response time (12 s) and could be used for 3 months without substantial change of the potential. The membrane sensor had very good selectivity for Zn2+ ions over a wide variety of other cations and could be used in a working pH range of 3.5-7.8. The sensor was also found to work satisfactorily in partially non-aqueous media and could be successfully used for estimation of zinc at trace levels in biological and environmental samples. © 2007 Springer-Verlag.
Citation: Analytical and Bioanalytical Chemistry (2007), 388(8): 1867-1876
URI: https://doi.org/10.1007/s00216-007-1434-5
http://repository.iitr.ac.in/handle/123456789/4147
Issue Date: 2007
Keywords: Ion-selective membrane sensors
Potassium hydrotris(3-tert-butyl-5-isopropyl-l-pyrazolyl) borate
Potassium hydrotris(N-tert-butyl-2- thioimidazolyl)borate
PVC membrane
Zinc-selective sensor
ISSN: 16182642
Author Scopus IDs: 57209223382
8954152100
57203181883
16444161100
Author Affiliations: Singh, A.K., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Mehtab, S., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Singh, U.P., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Aggarwal, V., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Funding Details: Acknowledgement Sameena Mehtab and Vaibhave Aggarwal are grateful to Council of Scientific and Industrial Research, New Delhi, India, for providing financial assistance for this work.
Corresponding Author: Singh, A.K.; Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India; email: akscyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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