Electroanalysis and coulometric analysis

Bard, Allen J.

doi:10.1021/ac60261a036

Cited by 10 publications

(3 citation statements)

References 74 publications

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“…By employing a thin-layer sample for the coulometry, the complete electrolysis can be achieved reasonably rapidly, in the time scale of seconds to minutes. Since the introduction of thin-layer coulometry for determination of redox-active species [7], its applications have expanded to non-electroactive ionic species based on ion transfer at the aqueous/organic solution interface [8][9][10][11][12]. In order to improve its selectivity, thin-layer coulometry based on ion-selective membrane is currently being pursued by our group and others [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Paper-supported thin-layer ion transfer voltammetry for ion detection

Ding

Cherubini

Yuan

et al. 2019

Sensors and Actuators B: Chemical

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We report here on paper-supported thin sample layer voltammetry for the determination of ions. To achieve this goal, a simple setup for the coupling of a commercially available electrode to a silver rod electrode was designed and evaluated for paper-supported thin-layer voltammetry. Linear scan ion transfer voltammetry was explored here for ion-selective membranes doped with an ionophore. The ion-transfer processes and electrochemical behaviors of the system are here evaluated and confirmed by numerical simulation. In the proof-of-concept experiments described, the ions tetrabutylammonium chloride (TBA +) and potassium (K +) were studied as model analytes at membranes without and with ionophore, respectively. A linear relationship from 0.1 mM to 1.0 mM K + was obtained between the charge and ion concentration. The coexistence of background sodium ions did not give appreciable interference, but the background wave was not completely isolated from the analyte wave, as also confirmed by the model. The methodology was successfully demonstrated for determination of K + in mineral water. It is anticipated that this paper-supported thin-layer detection approach may provide an attractive readout protocol for disposable paper-based analytical devices as the methodology does not place strict demands on reference electrode performance.

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Section: Introductionmentioning

confidence: 99%

Paper-supported thin-layer ion transfer voltammetry for ion detection

Ding

Cherubini

Yuan

et al. 2019

Sensors and Actuators B: Chemical

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“…A number of original reports [ 3 , 4 , 11 , 15 – 17 ] and reviews [ 1 , 2 , 5 – 10 , 12 – 14 ] on coulometric methods were published over the past decades. Coulometric method has been applied to analyze a large variety of inorganic and organic compounds [ 1 , 6 , 13 ]. Standardization of reagents is not required in coulometric analysis as the quantity of reagent prepared is directly determined from the charge passing through the cell.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Using an Electrolysis Cell for Quantification of the Electrolytic Products of Water from Gravimetric Measurement

Melaku

Gebeyehu

Dabke

2018

Journal of Analytical Methods in Chemistry

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A gravimetric method for the quantitative assessment of the products of electrolysis of water is presented. In this approach, the electrolysis cell was directly powered by 9 V batteries. Prior to electrolysis, a known amount of potassium hydrogen phthalate (KHP) was added to the cathode compartment, and an excess amount of KHCO3 was added to the anode compartment electrolyte. During electrolysis, cathode and anode compartments produced OH−(aq) and H+(aq) ions, respectively. Electrolytically produced OH−(aq) neutralized the KHP, and the completion of this neutralization was detected by a visual indicator color change. Electrolytically produced H+(aq) reacted with HCO3 −(aq) liberating CO2(g) from the anode compartment. Concurrent liberation of H2(g) and O2(g) at the cathode and anode, respectively, resulted in a decrease in the mass of the cell. Mass of the electrolysis cell was monitored. Liberation of CO2(g) resulted in a pronounced effect of a decrease in mass. Experimentally determined decrease in mass (53.7 g/Faraday) agreed with that predicted from Faraday's laws of electrolysis (53.0 g/Faraday). The efficacy of the cell was tested to quantify the acid content in household vinegar samples. Accurate results were obtained for vinegar analysis with a precision better than 5% in most cases. The cell offers the advantages of coulometric method and additionally simplifies the circuitry by eliminating the use of a constant current power source or a coulometer.

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“…The basis of thin-layer coulometry for electroactive species at metal electrodes was primarily established by Bard . More recently, the utilization of ion-selective membranes coupled with coulometry has been the focus of attention of Kihara and co-workers as well as our group. − Specifically, the thin-layer sample defined by the void between a Ag/AgCl wire element and a microporous hydrophobic tube doped with ion-selective components has been at the core of this work .…”

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confidence: 99%

Paper-Based Thin-Layer Coulometric Sensor for Halide Determination

2015

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We report on a paper-based analytical device (PAD) for the exhaustive, and therefore absolute, determination of halides in a range of diverse water samples and food supplements. A mixture of chloride, bromide, and iodide ions is assessed in a wide range of concentrations, specifically, from 10(-4.8) to 0.1 M for bromide and iodide and from 10(-4.5) to 0.6 M for chloride, with a limit of detection of 10(-5) M. As a result of a careful optimization of the electrochemical cell, a thin layer made of cellulose paper (75-μm thickness), a cation-exchange Donnan exclusion membrane (FKL), and a silver-foil working electrode were selected as optimum materials. Cyclic voltammetry (from 0 to 0.8 V) was chosen as the interrogation technique to impose the exhaustive oxidative plating and re-reduction of halides on the silver element, accompanied by outward and inward counterion fluxes. The scan rate plays an important role in the ability of the technique to resolve mixtures of ions. Moderate scan rates (10 mV s(-1)) provide a suitable compromise between sensitivity, limit of detection, and resolution. This paper-based microfluidic device is extremely simple in terms of manipulation, cost, and contamination risk. Paper is an excellent basis for the establishment of a confined thin aqueous layer, the construction of disposable halide sensors, and portability for measuring outside the controlled laboratory environment. A discussion of the relevant analytical characteristics is presented herein, followed by a demonstration of halide assessment in water samples (sea, tap, river, and mineral waters) and food supplements enriched with iodide and chloride as early examples.

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Electroanalysis and coulometric analysis

Abstract: This paper surveys the literature and developments during 1966 through December 1967; papers published before 1966 which have not appeared in previous reviews in this series have also been included.

Cited by 10 publications

References 74 publications

Paper-supported thin-layer ion transfer voltammetry for ion detection

Paper-supported thin-layer ion transfer voltammetry for ion detection

Feasibility of Using an Electrolysis Cell for Quantification of the Electrolytic Products of Water from Gravimetric Measurement

Paper-Based Thin-Layer Coulometric Sensor for Halide Determination

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