Ampérométrie avec deux électrodes indicatrices

Kies, H.L.

doi:10.1016/s0003-2670(00)87098-1

Cited by 13 publications

(6 citation statements)

References 54 publications

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“…Concerning the theoretical treatment of biamperometry the early work was done by Gauguin, Charlot, Duyckaerts and Kies [1][2][3][4]. Here a more rigorous and systematical approach of the influence of the parameters on the shape of the titration curves and on the end point detection is presented, especially the influence of different electrode areas and different kinetics.…”

Section: Introductionmentioning

confidence: 99%

Simulation of titration curves indicated with two indicator electrodes (biamperometry)

Surmann¹,

Peter²,

Stark³

1996

Analytical and Bioanalytical Chemistry

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A rigorous method to simulate titration curves with indication using two indicator electrodes (biamperometry) is presented. Computer simulations can be carried out for reversible as well as for irreversible systems. The different parameters like the area of the individual electrodes, applied potential difference, heterogeneous rate constant, and the kinetic parameter alpha were varied and investigated as to their influence upon the shape of the titration curves. The theoretically derived effects match with the effects obtained by experiment. Considering the effects described here, it is possible to tailor the shape of the titration curve by the experimental conditions for specific applications in order to get an optimum shape at the end point of the titration.

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Section: Introductionmentioning

confidence: 99%

Simulation of titration curves indicated with two indicator electrodes (biamperometry)

Surmann¹,

Peter²,

Stark³

1996

Analytical and Bioanalytical Chemistry

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“…Problem Although the redox titrations dealt with in this paper (cerimetry and bromatometry) are usually known for biamperometric indication [1][2][3][4][5], bivoltametric indication of the same systems is an important tool for all day drug analysis with a lot of applications [6][7][8], too, although it is mostly neglected in literature. Ideally, when a reversible system is titrated with a different P. Surmann ( ) · B. Peter · C. Stark Institute of Pharmacy of the Humboldt-University Berlin, Goethestrasse 54, D-13086 Berlin, Germany reversible system, peak shaped curves are obtained and the maximum indicates the point of equivalence [5].…”

Section: Introductionmentioning

confidence: 99%

Bivoltametric titrations using electrodes with innovative geometry

Surmann

Peter

Stark

1996

Analytical and Bioanalytical Chemistry

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Electrodes with different surface areas were investigated for the determination of reversible, quasireversible, irreversible or electroinactive substrates. Two kinds of electrodes were constructed, a helical electrode with a given asymmetry and a platinum array electrode with a variable area. These electrodes were applied for the cerimetry of ammonium iron(II) sulfate and for the bromatometry of various organic substances. The theoretically derived effects on the shape of the voltametric titration curve are verified experimentally. It is possible to sharpen one side of the peak and to broaden the other side, depending on the system and the side of the peak one is interested in. It is possible to improve the bivoltametric determination of hydroquinone, benzocaine and sulfaguanidine by bromatometry by the directed employment of electrodes of different areas. For the bromatometric determination of electrochemically irreversible substrates the use of the electrode geometries proposed is a way to obtain a sharp bend and a steep decrease of titration curves with low values of the constant current which is a basic requirement for the accuracy.

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“…These simulated titration curves are in qualitative agreement with experimental data for a variety of titration reactions and electrode area ratios and indicate that end point detection can be improved by using electrodes of different area. More complicated scenarios with multiple redox couples have also been studied, and relevant equations have been developed to describe constant-potential titration curves in the simple and more complicated cases; applications have been described for a wide variety of redox reactions. − …”

mentioning

confidence: 99%

Cyclic Biamperometry

Rahimi

Mikkelsen

2010

Anal. Chem.

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Cyclic biamperometry has been investigated as a method for the quantitation of one form of a reversibly electroactive redox couple in the presence of the other form, using the ferri-ferrocyanide couple in aqueous KCl. A triangular voltage waveform applied across two equal-area, planar gold electrodes yields peak currents that depend on the square root of the applied voltage scan rate, when one form of the redox couple is present in excess. Independent measurement of electrode-to-solution potential during biamperometric scans allowed estimation of the fractional impedance at each electrode-solution interface, and these values allow calculation of the effective potential scan rates at each electrode. Results show that when one form is present in a 5-fold excess or greater, the potential scan rate for the limiting reaction is nearly identical to the applied voltage scan rate. Similar values were obtained from impedance calculations, but discrepancies between the predicted and experimental values are evident when the two forms are present at near equivalent concentrations. When one form of the redox couple is present in excess, cyclic biamperometric peak currents depend linearly on the concentration of the limiting form, and these currents can be amplified by using cells with one electrode much larger than the other. Because this method does not require a reference electrode, it can, in principle, be readily incorporated into new electrochemical array or lab-on-a-chip devices.

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Ampérométrie avec deux électrodes indicatrices

Cited by 13 publications

References 54 publications

Simulation of titration curves indicated with two indicator electrodes (biamperometry)

Simulation of titration curves indicated with two indicator electrodes (biamperometry)

Bivoltametric titrations using electrodes with innovative geometry

Cyclic Biamperometry

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