Influence of Incorporated Lipophilic Particles on Ion Fluxes Through Polymeric Ion‐Selective Membranes

Vigassy, Tamás; Gyurcsányi, Róbert E.; Pretsch, Ernö

doi:10.1002/elan.200390043

Cited by 40 publications

(35 citation statements)

References 39 publications

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“…Moreover, superNernstian potential jumps are typically observed at concentrations at or below 1 × 10 −6 M, suggesting that the super-Nernstian response observed here may be caused by a different phenomenon. The Pretsch group has studied the influence of lipophilic silica gel particles on trans-membrane ion fluxes that occur in ISE membranes [28]. They concluded that a super-Nernstian electrode response could be eliminated if the ion-selective membrane was inverted, so that the particle layer was located on the sample side of the membrane.…”

Section: Resultsmentioning

confidence: 99%

Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Peper

Gonczy

2011

International Journal of Electrochemistry

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Cs + -selective solvent polymeric membrane-based ion-selective electrodes (ISEs) were developed by doping ethylene glycolfunctionalized cross-linked polystyrene microspheres (P-EG) into a plasticized poly(vinyl chloride) (PVC) matrix containing sodium tetrakis-(3,5-bis(trifluoromethyl)phenyl) borate (TFPB) as the ion exchanger. A systematic study examining the effects of the membrane plasticizers bis(2-ethylhexyl) sebacate (DOS), 2-nitrophenyl octyl ether (NPOE), and 2-fluorophenyl nitrophenyl ether (FPNPE) on the potentiometric response and selectivity of the corresponding electrodes was performed. Under certain conditions, P-EG-based ion-selective electrodes (ISEs) containing TFPB and plasticized with NPOE exhibited a super-Nernstian response between 1 × 10 −3 and 1 × 10 −4 M Cs + , a response characteristic not observed in analogous membranes plasticized with either DOS or FPNPE. Additionally, the performance of P-EG-based ISEs was compared to electrodes based on two mobile ionophores, a neutral lipophilic ethylene glycol derivative (ethylene glycol monooctadecyl ether (U-EG)) and a charged metallacarborane ionophore, sodium bis(dicarbollyl)cobaltate(III) (CC). In general, P-EG-based electrodes plasticized with FPNPE yielded the best performance, with a linear range from 10 −1 -10 −5 M Cs + , a conventional lower detection limit of 8.1 × 10 −6 M Cs + , and a response slope of 57.7 mV/decade. The pH response of P-EG ISEs containing TFPB was evaluated for membranes plasticized with either NPOE or FPNPE. In both cases, the electrodes remained stable throughout the pH range 3-12, with only slight proton interference observed below pH 3.

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Section: Resultsmentioning

confidence: 99%

Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Peper

Gonczy

2011

International Journal of Electrochemistry

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“…Another method of reducing transmembrane ion fluxes made use of lipophilic silica gel particles of 15 -35 mm diameter added to the membrane matrix [54]. It was shown that the apparent super-Nernstian response of ISEs caused by a strong flux of primary ions from the sample to the inner solution can be suppressed completely (see Fig.…”

Section: Suppressing Ion Fluxes In the Membranementioning

confidence: 99%

Approaches to Improving the Lower Detection Limit of Polymeric Membrane Ion‐Selective Electrodes

et al. 2006

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“…Normally, the diffusion coefficients in the aqueous phase may not be increased. Recently, a lowering of the LOD that was independent of the composition of the inner solution was also achieved by partially blocking the sample side of the membrane by using inert lipophilic microparticles that were embedded during membrane construction [21].…”

Section: Polymeric Membrane Potentiometric Sensors With Aqueous Innermentioning

confidence: 99%

Potentiometric sensors for trace-level analysis

Bakker

Pretsch

2005

TrAC Trends in Analytical Chemistry

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123

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This review summarizes recent progress in the development and application of potentiometric sensors with limits of detection (LODs) in the range 10 −8 -10 −11 M. These LODs relate to total sample concentrations and are defined according to a definition unique to potentiometric sensors. LODs calculated according to traditional protocols (three times the standard deviation of the noise) yield values that are two orders of magnitude lower. We are targeting this article at analytical chemists who are non-specialists in the development of such sensors so that this technology may be adopted by a growing number of research groups to solve real-world analytical problems.We discuss the unique response features of potentiometric sensors and compare them to other analytical techniques, emphasizing that the choice of the method must depend on the problem of interest. We discuss recent directions in sensor design and development and present a list of 23 sensors with low LODs, with references. We give recent examples where potentiometric sensors have been used to solve trace-level analytical problems, including the speciation of lead and copper ions in drinking water, the measurement of free copper in sea water, and the uptake of cadmium ions by plant roots as a function of their speciation.

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Influence of Incorporated Lipophilic Particles on Ion Fluxes Through Polymeric Ion‐Selective Membranes

Cited by 40 publications

References 39 publications

Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Approaches to Improving the Lower Detection Limit of Polymeric Membrane Ion‐Selective Electrodes

Potentiometric sensors for trace-level analysis

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