Steady state voltammetry in the process of hydrogen evolution in buffer solutions

Daniele, Salvatore; Baldo, M. Antonietta; Bragato, Carlo; Lavagnini, Irma

doi:10.1016/s0003-2670(97)00695-8

Cited by 20 publications

(15 citation statements)

References 15 publications

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“…Voltammetric experiments in lactic and acetic acids solutions were performed with platinum microelectrodes for a range of acid concentrations wider than those reported in similar studies (up to 10 mM [7,11,12] or 100 mM [2]). While voltammograms recorded for acid concentrations lower or equal to 300 mM were well defined, those from higher concentrations were frequently spoiled by the hydrogen evolution.…”

Section: Resultsmentioning

confidence: 99%

“…Recently some research groups have studied the voltammetric reduction of hydrogen using microelectrodes [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The voltammetric steady-state limiting current of strong acids was found to be linearly related to the microelectrode dimension and to the hydrogen ion concentration [2,7], demonstrating thus that the process is mass-transport controlled.…”

Section: Introductionmentioning

confidence: 99%

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Voltammetric analysis of weak acids with microelectrodes

Canhoto

Matos

Rodrigues

et al. 2004

Journal of Electroanalytical Chemistry

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The role of H þ on the steady-state voltammetric limiting current (I L ) of weak acid (HA) reduction was studied considering results from either lactic acid or acetic acid solutions at constant pH. For solutions with pH > pK a or pH ffi pK a the [H þ ] effect on the I L vs c HA slope was important even when the H þ current contribution was minor. In contrast, when the pH ( pK a high H þ current contributions were found; nevertheless the I L vs c HA slope was almost insensitive to pH. A general relationship between I L and c HA was derived considering both the H þ current contribution and the dissociation extent. This equation allows the analytical determination of weak acids, alone or in the presence of strong acids, from experimental I L and pH. Acid identification can also be performed through the expression presented, following the I L susceptibility to pH at constant c HA .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Voltammetric analysis of weak acids with microelectrodes

Canhoto

Matos

Rodrigues

et al. 2004

Journal of Electroanalytical Chemistry

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“…Figure 1 presents the square-wave voltammograms recorded from solutions of identical concentration of lactic acid and pH 4.10, in the different culture media (curves a), b), c) and d)) or in 0.1 M KCl (curve e)). All the voltammograms displayed a peak of similar height at approximately À 0.57 V (vs. SCE), characteristic of the hydrogen evolution process at platinum from a solution of lactic acid [7,8]. The similarity of the height and position of these peaks ( Figure 1) indicated that the constituents of the culture media did not interfere in an appreciable extent with the reduction process of lactic acid.…”

Section: Characterization Of the Voltammetric Response Of Lactic Acidmentioning

confidence: 87%

“…The voltammetric reduction of H þ using microelectrodes can be an interesting approach for the determination of weak acids as linear correlations were found between the voltammetric current and the concentration of weak acid in a broad concentration range [7,8]. Furthermore, the electrochemical techniques present several advantages over chromatographic and enzymatic assays, including the time and the cost of the analysis.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Lactic Acid Consumption in Yeast Cultures by Voltammetric Means

et al. 2005

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The voltammetric study of the lactic acid reduction was performed in media suitable for yeast growth, using platinum microelectrodes. The decrease of the voltammetric peak current from square-wave voltammetry, DI p , in cultures of the yeasts Candida utilis and Saccharomyces cerevisiae was related to both the growth time and cellular biomass. Either the imposed variations of medium composition or those resulting from cellular growth did not significantly affect the DI p values. For both yeast species, similar specific growth rates were estimated from the variation of I p and absorbance at 640 nm.

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“…In agreement with previous studies, proton reduction involves a chemicalelectrochemical mechanism. Reaction mechanisms have already been studied under different conditions [41][42][43][44][45][46][47][48][49][50][51] and it was shown that no proton diffuses toward the electrode surface; on the contrary, it is the weak acid that releases the weak base [51]. The dehydrogenation stage of TH -is very fast and the electrochemical reaction is controlled by the electron transfer rate.…”

Section: Voltammetric Measurementsmentioning

confidence: 99%

Influence of electrical potential on the crystallization and adhesion of potassium hydrogen tartrate crystals

2009

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Interfacial interactions between a hydroalcoholic solution of potassium hydrogen tartrate (KHT) and a stainless steel surface are studied, when an electrical potential is applied to the metal substrate. The capacitive domain of the metal-solution interface is determined by cyclic voltammetry. In order to study the influence of the potential on KHT nucleation and crystal adhesion, the solid-liquid interfacial energy is assessed from contact angle and capillary rise measurements. Experimentally, the contact angle between a NaF solution and a stainless steel vs. the potential has a parabolic behaviour. The metal topography has no apparent influence on physicochemical properties of the interface when ethanol is present in a KHT solution. The metal substrate promotes the formation of KHT crystals, which is improved by the application of an anodic potential. The adhesion of crystals becomes more effective when wires of 25 lm diameter are used in comparison with those of 250 lm.

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Steady state voltammetry in the process of hydrogen evolution in buffer solutions

Cited by 20 publications

References 15 publications

Voltammetric analysis of weak acids with microelectrodes

Voltammetric analysis of weak acids with microelectrodes

Evaluation of the Lactic Acid Consumption in Yeast Cultures by Voltammetric Means

Influence of electrical potential on the crystallization and adhesion of potassium hydrogen tartrate crystals

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