Results 211 to 220 of about 9,067 (244)
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Square-Wave Voltammetry of Cocaine
Analytica chimica acta, 2004Electrochemical 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 +4 more
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Theory of multiple square wave voltammetries
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1986Abstract 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 +3 more
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Square-wave voltammetry of berberine
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1987Abstract 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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Square-wave voltammetry of an aqueous solution of indigo
Journal of Electroanalytical Chemistry, 2000Indigo is dissolved in water in the concentration of 5×10-5 mol/L and measured by highly sensitive adsorptive stripping square-wave voltammetry in order to determine the parameters of its electrochemical reduction. The formal potential of indigo/leucoindigo redox couple dissolved in the aqueous 0.7 mol/L KNO3, pH 12 (NaOH) is -0.566 ą 0.003 V vs Ag ...
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Differential Multipulse and Square Wave Voltammetries
2016The electrochemical techniques considered in this chapter present as a common feature that the recorded signal is the difference between the current (or converted charge) sampled at the end of consecutive potential pulses of a given sequence E 1, E 2, …, E p without the initial conditions being regained.
Ángela Molina, Joaquín González
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Quasireversible Maximum in Cathodic Stripping Square-Wave Voltammetry
Electroanalysis, 1999The 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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Multiple square wave voltammetry: experimental verification of the theory
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1990The experimental verification of a new multi-impulse electroanalytical method, multiple square wave voltammetry (MSWV), in which several impulses of constant amplitude are superimposed on each step of a staircase waveform is presented. In particular, it has been confirmed that the voltammograms, obtained from current or charge measurements at a SMDE ...
Krulic, Denise +2 more
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Redox kinetics in cathodic stripping square‐wave voltammetry
Electroanalysis, 1995AbstractSeveral redox systems with reactants which are immobilized at the electrode surface (EuSal complex, SeIV and SeIV in the presence of CuII, cysteine and p‐nitrophenol) were studied by square‐wave voltammetry to examine whether their redox kinetics can be measured by using the phenomenon of the ‘quasireversible maximum’.
Lovrić, Milivoj, Mlakar, Marina
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Square-wave adsorptive cathodic stripping voltammetry of pantoprazole
Journal of Pharmaceutical and Biomedical Analysis, 2003Adsorption and reduction of pantoprazole were investigated by cyclic and square-wave voltammetry on a hanging mercury drop electrode in Britton-Robinson buffers at pH 2.0-11.0. The reduction process gave rise to a single peak within the entire pH range.
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Square-wave voltammetry of Ofloxacin
2000Adsorption phenomena of ofloxacin at a hanging mercury drop electrode in Britton Robinson buffer solution with pH of 8.36 were studied by means of square-wave voltammetry.
Gulaboski, Rubin, Jordanoski, Blagoja
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