Potentiometric sensors for trace-level analysis

Bakker, Eric; Pretsch, Ernö

doi:10.1016/j.trac.2005.01.003

Cited by 301 publications

(134 citation statements)

References 65 publications

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“…These membranes are frequently interrogated by the simplest electrochemistry technique, potentiometry, and are typically sensitive to ion activity changes in the sample solution [4]. While traditional membrane electrodes are backside contacted with an aqueous electrolyte [5,6], recent efforts aimed at replacing the inner solution by a solid contact ion-to-electron transducer [7,8], which includes conducting polymers [6,9,10] and nanostructured materials [8,[11][12][13] as potential candidates to replace the inner filling solution and the Ag/AgCl element.…”

Section: Introductionmentioning

confidence: 99%

All solid state chronopotentiometric ion-selective electrodes based on ferrocene functionalized PVC

Jarolímová

Crespo

Afshar

et al. 2013

Journal of Electroanalytical Chemistry

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a b s t r a c tAn all solid contact ion-selective electrode based on poly(vinyl chloride) covalently modified with ferrocene moieties allows one to operate the membrane in a chronopotentiometric sensing mode. The membrane is considered as initially non-perm-selective towards anions, and an applied anodic current provokes a defined anion flux in direction of the membrane. With this protocol, a variety of anions can be depleted at the membrane surface. Since this model system does not yet contain an ionophore, their order of preference follows the expected Hofmeister selectivity sequence. The all solid-state configuration tolerates an imposed current density of 1.4 lA mm À2 , which translates into an upper detection limit of ca. 1.2 mM. Higher current densities of up to 31.2 lA mm À2 are possible with addition of freely dissolved alkyl ferrocene derivative for an expected upper detection limit of 17.0 mM. Numerical simulations are performed in order to establish the fundamental basis of the mechanism that takes place in this all solid-state membrane electrode. The oxidation of bound Fc and the ion-transfer process are considered in the simulation. In view of developing an analytical sensor, different anions are tested. A linear range of two orders of magnitude from 0.01 to 1 mM is found. The membranes are evaluated over several days, displaying practically the same slopes and intercepts, with a RSD of less than 2%. Electrochemical limitations of free Fc and bound Fc are critical evaluated. This approach should allow one to develop a new family of solid-state chronopotentiometric ion sensors that require relatively high current densities.

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Section: Introductionmentioning

confidence: 99%

All solid state chronopotentiometric ion-selective electrodes based on ferrocene functionalized PVC

Jarolímová

Crespo

Afshar

et al. 2013

Journal of Electroanalytical Chemistry

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“…[5][6] One critical component in potentiometric measurement technique is the reference electrode, which is as important as the working electrode. Till date, research on reference electrode has not been conducted as much as the research on the development of working electrode.…”

Section: Emf E Zf Rt Log a 2 303mentioning

confidence: 99%

Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

Alva¹,

Aziz²,

Syono³

et al. 2017

JPS

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“…The constant release of primary ions under zero-current conditions from inner filling solution into sample solution which dictated the detection limit of the potentiometric sensor at low sample con- centrations has been extensively studied in recent years [26]. Direct evidence of permanganate fluxes across ISE membrane has been tracked by graphite stove atomic absorption spectroscopy [18].…”

Section: Current-controlled Release Of Permanganate Ions At Membrane mentioning

confidence: 99%

Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

Song

Ding

Liang

et al. 2011

Analytica Chimica Acta

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a b s t r a c tA polymeric membrane permanganate-selective electrode has been developed as a current-controlled reagent release system for potentiometric detection of reductants in flow injection analysis. By applying an external current, diffusion of permanganate ions across the polymeric membrane can be controlled precisely. The permanganate ions released at the sample-membrane interface from the inner filling solution of the electrode are consumed by reaction with a reductant in the sample solution thus changing the measured membrane potential, by which the reductant can be sensed potentiometrically. Ascorbate, dopamine and norepinephrine have been employed as the model reductants. Under the optimized conditions, the potential peak heights are proportional to the reductant concentrations in the ranges of 1.0 × 10 −5 to 2.5 × 10 −7 M for ascorbate, of 1.0 × 10 −5 to 5.0 × 10 −7 M for dopamine, and of 1.0 × 10 −5 to 5.0 × 10 −7 M for norepinephrine, respectively with the corresponding detection limits of 7.8 × 10 −8 , 1.0 × 10 −7 and 1.0 × 10 −7 M. The proposed system has been successfully applied to the determination of reductants in pharmaceutical preparations and vegetables, and the results agree well with those of iodimetric analysis.

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Potentiometric sensors for trace-level analysis

Cited by 301 publications

References 65 publications

All solid state chronopotentiometric ion-selective electrodes based on ferrocene functionalized PVC

All solid state chronopotentiometric ion-selective electrodes based on ferrocene functionalized PVC

Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

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