TITLE

Tripodal chelating ligand-based sensor for selective determination of Zn(II) in biological and environmental samples

AUTHOR(S)
Singh, Ashok Kumar; Mehtab, Sameena; Singh, Udai P.; Aggarwal, Vaibhave
PUB. DATE
August 2007
SOURCE
Analytical & Bioanalytical Chemistry;Aug2007, Vol. 388 Issue 8, p1867
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Potassium hydrotris( N- tert-butyl-2-thioimidazolyl)borate [KTtt-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 [KTtt-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.
ACCESSION #
25905057

 

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