Results 231 to 240 of about 29,788 (277)

Fourier transform square-wave voltammetry

Journal of Electroanalytical Chemistry, 1994
Abstract In this technique a potential excitation waveform is obtained by a superposition of a small amplitude square-wave modulation on a staircase function. The square-wave cycle is repeated several times (usually 16) at each potential step. The electrode response is sampled at even time intervals 2 n (where n = 2, 3, 4…) times per square-wave
Andrzej Baranski, Agata Szulborska
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Analysis of Cardamonin by Square Wave Voltammetry

Phytochemical Analysis, 2011
ABSTRACTIntroductionSeveral biochemical studies have already shown that cardamonin has health promoting properties, such is in agreement with typical characteristics of chalcones. Although being a very promising compound for the nutraceutical field there is a lack of studies concerning its electroanalytical properties.ObjectiveTo develop an ...
Ana M, Carvalho, Luís M, Gonçalves, Inês M, Valente, José A, Rodrigues, Aquiles A, Barros   +4 more
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Square-wave voltammetry for ECE mechanisms

The Journal of Physical Chemistry, 1990
The theory of square-wave voltammetry is extended to include the ECE mechanism in which an intermediate chemical step occurs between sequential electrode reactions. Exemplary calculations show how the thermodynamic and kinetic parameters of this mechanism affect the shapes of square-wave voltammograms.
John J. O'Dea, K. Wikiel, Janet. Osteryoung   +2 more
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Theory of multiple square wave voltammetries

Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1986
Abstract A study of square wave voltammetries in which several pairs of opposing impulses are superimposed on each step of a staircase waveform, with or without integration of the current, is presented for reversible redox systems. The new fast techniques that result, yield responses greater than those obtained with the other classical methods.
N. Fatouros, J.P. Simonin, J. Chevalet, R.M. Reeves   +3 more
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Hot-SWV: Square Wave Voltammetry with Hot Microelectrodes

Analytical Chemistry, 2020
A promising strategy to lowering detection limits in electrochemical analysis is the active modulation of the electrode temperature. Specifically, by tuning the electrode's surface temperature one can enhance detection limits due to improved electrode process kinetics and increased mass transfer rates, all without affecting the bulk solution. Motivated
Ariana Frkonja-Kuczin, Josean Y. Alicea-Salas, Netzahualcóyotl Arroyo-Currás, Aliaksei Boika   +3 more
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Reverse scans in square wave voltammetry

Journal of Electroanalytical Chemistry, 2002
Reverse scans in square wave voltammetry (SWV) leading to the regeneration of the substance initially present in solution are studied. Widths and peak potentials of waves in SWV performed with both negative and positive potential scans allow us to determine easily the kinetic parameters of a slow electrochemical reaction.
Fatouros, Nicolas, Krulic, Denise
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Square-Wave Voltammetry

2005
Square-wave voltammetry (SWV) is one of the four major voltammetric techniques provided by modern computer-controlled electroanalytical instruments, such as Autolab and µAutolab (both EcoChemie, Utrecht), BAS 100 A (Bioanalytical Systems) and PAR Model 384 B (Princeton Applied Research).
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Quasireversible Maximum in Cathodic Stripping Square-Wave Voltammetry

Electroanalysis, 1999
The apparent reversibility of a redox reaction, together with the position of the quasireversible maximum, depend on the single complex kinetic parameter K, which is defined through the standard rate constant, diffusion coefficient of the ligand and frequency of the SW signal.
Mirčeski, Valentin, Lovrić, Milivoj
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Square-Wave Voltammetry of Cocaine

Analytica chimica acta, 2004
Electrochemical properties of cocaine and its metabolites such as benzoyl ecgonine (BE), ecgonine, and methyl ester ecgonine have been studied by means of square-wave voltammetry at a hanging mercury drop electrode. In a phosphate buffer at pH = 7 cocaine give rise to a single voltammetric peak at about - 1.490 V vs Ag/AgCl (3 mol/L KCl). At higher pH,
Pavlova, Valentina, Mirčeski, Valentin, Komorsky-Lovrić, Šebojka, Petrovska-Jovanović, Simka, Mitrevski, Blagoj   +4 more
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Square-wave voltammetry of berberine

Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1987
Abstract Square-wave voltammetry (SWV) is applied to the quantitative analysis of berberine in supporting electrolytes of different pHs. In 0.1 mol/dm3 aqueous solution of NaCl+HCl (pH 2) the lowest detectable concentration of berberine is 0.006 μg/ml. The sensitivity of SWV can be increased by prolonged adsorptive accumulation of berberine.
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