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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4150
Title: Comparative studies of tridentate sulfur and nitrogen-containing ligands as ionophores for construction of cadmium ion-selective membrane sensors
Authors: Singh A.K.
Mehtab S.
Singh U.P.
Aggarwal V.
Published in: Electroanalysis
Abstract: New polymeric membrane cadmium-ion selective sensors have been prepared by incorporating nitrogen and sulfur containing tridentate ligands as the ionophores into the plasticized PVC membranes. Poly(vinyl chloride) (PVC) based membranes of potassium hydrotris[N-(2,6-xylyl)thioimdazolyl) borate] (KTt 2,6-xylyl) and potassium hydrotris(3-phenyl-5-methylpyrazolyl) borate (KTpPh,Me) with sodium tetraphenyl borate (NaTPB) as an anionic excluder and dibutylphthalate (DBP), tributylphthalate (TBP), dioctylsebacate (DOS), and o-nitrophenyloctyl ether (o-NPOE) as plasticizing solvent mediators were investigated in different compositions. KTt2,6-xylyl was found to be a selective and sensitive ion carrier for Cd(II) membrane sensor. A membrane composed of KTt2,6-xylyl:NaTPB:PVC:DBP with the % mole ratio 2.3:1.1:34.8:61.8 (w/w) works well over a very wide concentration range (7.8 × 10-8 - 1.0 × 10-2 M) with a Nernstian slope of 29.4 ± 0.2 mV/decades of activity between pH values of 3.5 to 9.0 with a detection limit of 4.37 × 10-8 M. The sensor displays very good discrimination toward Cd(II) ions with regard to most common cations. The proposed sensor shows a short response time for whole concentration range (ca. 8 s). The effects of the cationic (tetrabutylammonium chloride, TBC), anionic (sodium dodecyl sulfate, SDS) and nonionic (Triton X-100) surfactants were investigated on the potentiometric properties of proposed cadmium-selective sensor. The proposed sensor based on KTt2,6-xylyl ionophore has also been used for the direct determination of cadmium ions in different water samples and human urine samples. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.
Citation: Electroanalysis (2007), 19(11): 1213-1221
URI: https://doi.org/10.1002/elan.200703846
http://repository.iitr.ac.in/handle/123456789/4150
Issue Date: 2007
Keywords: Cadmium ion
Hydrotris(thioimdazolyl) borate
Ion-selective sensor
Potentiometry
PVC membrane
ISSN: 10400397
Author Scopus IDs: 57209223382
8954152100
57203181883
16444161100
Author Affiliations: Singh, A.K., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247667, India
Mehtab, S., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247667, India
Singh, U.P., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247667, India
Aggarwal, V., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247667, India
Corresponding Author: Singh, A.K.; Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247667, India; email: akscyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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