Tripodal chelating ligand-based sensor for selective determination of Zn(II) in biological and environmental samples (original) (raw)
Related papers
A new macrocyclic polystyrene based membrane sensor for zinc
Electroanalysis, 1997
A quadridentate dihydrogen perchlorate macrocyclic membrane is found to exhibit quite promising selectivity for Zn' ' . It can be used to estimate zinc in the range 2.5 x to 1.0 x10-l mol d K 3 (0.16 to 6.50 x 103mg dm-3) with a near-Nernstian slope of=28mV per decade of concentration. The working pH range of the sensor is 3.0 to 7.0. The polystyrene based membrane electrode is found to possess adequate stability and specific selectivity with a response time of 10 s. Most of the ions that interfere with Zn2+ electrodes do not cause any significant disturbance with this assembly and the sensor can be used for more than three months in aqueous as well as in partially nonaqueous media. The utility of the membrane sensor has also been observed in solutions contaminated with detergent matter. The membrane sensor has also been used successfully to analyse some baby food products and soft drinks for the determination of Zn2+ ions.
2005
The 3-[(2-furylmethylene) amino]-2-thioxo-1, 3-thiazolidin-4-one (FTT) was used as an excellent ionophore in construction of a Zn2+ PVC-based membrane sensor. The best performance was obtained with a membrane composition of 30% poly (vinyl chloride), 62% nitrobenzen (NB), 3% FTT and 5% sodium tetraphenyl borate (TBP). This membrane sensor shows very good selectivity and sensitivity towards Zn2+ over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions.
Analytical and Bioanalytical Chemistry, 2022
The first, novel solid-state membrane sensor for Zn(II) determination is developed based on ZnS nanoparticles. ZnS nanoparticles are synthesized by chemical co-precipitation and investigated via X-ray diffraction, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and impedance study. X-ray diffraction shows that the prepared ZnS nanoparticles have an average domain size of 5.72 nm, which is very close to the particle size obtained from TEM observations (6.30 nm). The ZnS nanoparticles are pressed into disks and examined as electroactive solid-state membrane. Solid-state membrane and coated wire sensors are fabricated. They display linear responses over concentration ranges of 1.0 × 10 −5 to 1.0 × 10 −1 mol L −1 Zn 2+ ions with cationic slopes of 28.9±0.2 and 25.9±0.2 mV decade −1 for the solid-state membrane and coated wire sensors, respectively. The lower limits of detection are 2.86 × 10 −6 and 4.60 × 10 −6 mol L −1 Zn 2+ ions for the solid-state membrane and coated wire sensors, respectively. The response time for the two sensors is instantaneous (1 s), and the useful lifetimes for the solid-state membrane and coated wire sensors are long (10 and 6 months, respectively). The solid-state membrane sensor is utilized for the quantification of Zn(II) ions in brass alloys and pharmaceutical preparations.
A New Zn2+-Selective Sensor Based on 5,10,15,20-Tetraphenyl-21H,23H-porphine in PVC Matrix
Electroanalysis, 2001
PVC based membrane incorporating 5,10,15,20-tetraphenyl-21H,23H-porphine (I) as an electroactive material, sodium tetraphenyl borate (NaTPB) as an additive and tri-n-butyl phosphate (TBP) as solvent mediator, in the ratio 200 : 5 : 2 : 150; (w/w) (PVC : I : NaTPB : TBP) has been used as a Zn 2þ -selective sensor. The sensor works in a wide concentration range (6.2610 76 -1.0610 71 M) with Nernstian slope (29.0 AE 1.0 mV=decade of activity) and a response time as fast as 12 s. The working pH range of the sensor is 3.8-7.7 and it can tolerate a nonaqueous content up to 25 % (v=v) (acetone, methyl alcohol and ethyl alcohol). The life time of this sensor is more than six months. It exhibits moderate selectivity over a number of cations and has been used as an indicator electrode in the potentiometric titration of Zn 2þ against EDTA solution.
PVC-Based 2,2,2-Cryptand Sensor for Zinc Ions
Analytical Chemistry, 1996
A PVC-based membrane of 2,2,2-cryptand exhibits a very good response for Zn 2+ in a wide concentration range (from 2.06 ppm to 6.54 × 10 3 ppm) with a slope of 22.0 mV/decade of Zn 2+ concentration. The response time of the sensor is <10 s, and the membrane can be used for more than 3 months without any observed divergence in potentials. The proposed sensor exhibits very good selectivity for Zn 2+ over other cations and can be used in a wide pH range (2.8-7.0). It has also been possible to use this assembly as an indicator electrode in potentiometric titrations involving zinc ions.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
A sensor membrane with excellent performance based on 1-methyl-1-phenyl-3-[1-hydroxyimino-2-(succinimido)ethyl]cyclobutane has been developed for the determination of zinc(II) ions. The sensing membrane is capable of determining zinc(II) with an outstanding high selectivity over a dynamic range between 8.0 × 10 −8 and 1.6 × 10 −4 mol L −1 with a limit of detection of 2.5 × 10 −8 mol L −1 (1.6 g L −1). It can be easily and completely regenerated by using 0.1 mol L −1 EDTA solution. The optical sensor developed here was found to be stable, cost effective, easy to prepare, and has unique selectivity towards Zn 2+ ion with respect to common metal ions. The proposed sensor was then applied for the determination of zinc in tap water and hair samples with satisfactory results.
The performance characteristics of polymeric membrane electrodes based on 2,6diacetylpyridinebis(benzenesulfonylhydrazide) ligand (L) have been prepared for the quantification of zinc(II) ions. Several membranes having different compositions of PVC, plasticizers, and ionophore were fabricated and the best response was observed for the membrane composition L: PVC: DBP in the ratio of 10:30:60 (w/w). It exhibited a very good response for Zn 2+ in a wide concentration range from 1.0×10 −6 to 1.0×10 −1 M with a slope of 29.06 ± 0.1 mV per decade of Zn 2+ concentration. The detection limit was down to 1.0×10-7 M. The working pH range of this sensor was 4-12 with the fast response time less than 20 second. The developed method was applied for the determination of zinc(II) concentration in the wastewater samples and the results were in good agreement with an atomic absorption (AAS) which was obtained here.
Zn 2+ sensor based onZn-bis(2,4,4-trimethylpentyl)dithiophosphinicacid complex in PVC matrix
Electrochimica Acta, 1998
AbstractÐA zinc complex of the organic ion exchanger, bis(2,4,4-trimethylpentyl) dithiophosphinic acid, has been used as an electroactive material for the preparation of PVC-based Zn 2+ -selective electrodes. The PVC matrix incorporating sodium tetraphenylborate (NaTPB) as the anion excluder and dibutyl(butyl)phosphonate (DBBP) as the solvent mediator along with the above complex in the ratio 7:29:5:59 (Zn±Cyanex-301:DBBP:NaTPB:PVC) exhibited a working concentration range of 2.8 Â 10 À5 ±1.0 Â 10 À1 M, with a slope of 30.1 mV per decade of activity and a fast response time of 15 s. The valid pH range for the membrane sensor is 2.1±6.9 and it can also be used in partially non-aqueous medium having upto 10% (v/v) non-aqueous content. The sensor exhibits good selectivity over a number of other cations and has been applied as indicator electrode in the potentiometric titration of Zn 2+ against EDTA for the determination of end point. #