Amperometric determination of ethanol in beverages at copper electrodes in alkaline medium

Paixão, Thiago R.L.C.; Corbo, Dennys; Bertotti, Mauro

doi:10.1016/s0003-2670(02)00942-x

Cited by 110 publications

(66 citation statements)

References 30 publications

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“…Cu metal is easy to oxidize to form its oxide compound. In alkaline medium, it will form a thin coating on the surface of the electrode Cu 2 O, CuO, and Cu(OH) 2 , besides other species, are deposited on the electrode surface depending on the potential, pH, the mass-transport conditions and ageing and surface restructuring processes [14].…”

Section: Voltammetric Response Using Cyclic Voltammetrymentioning

confidence: 99%

“…2) and also peak at 600 mV. Invisible peak progressively at concentration of KOH under 0.5 M, no current peaks were observed in the positive potential range when cyclic voltammograms were recorded with the copper electrodes at supporting electrolyte concentrations lower than 0.1 M NaOH [14]. The rate of an electrochemical process is expressed by the current density that is the current flow per unit area.…”

Section: Voltammetric Response Using Cyclic Voltammetrymentioning

confidence: 99%

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SYNTHESIS OF ACETIC ACID FROM ETHANOL BY ELECTROOXIDATION TECHNIQUE USING Ni-Cu-PVC ELECTRODE

Riyanto

Othman

Salimon

2017

AJSTD

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A usage of Ni-Cu-PVC electrode for the oxidation of ethanol by electrochemical technique will be reported in this paper. In this work, the effect of electrodes on the yields of acetic acid was determined. Electrode used was made of the mixtures of Ni powder, Cu powder and of polyvinyl chloride (PVC) with various percentages. Electrooxidation of 0.20 M ethanol in 0.16 M KOH (24 mL) were carried out using chrono coulometry (CC) at a potential of 1050 mV for 6 hours with continious stirring. Electrooxdation result obtained was analyzed using High Performance Liquid Chromatography (HPLC). The test result shows that the composition of Ni:Cu:PVC at 75:20:5 have higher efficiency in the electrooxidation of ethanol to acetic acid.

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Section: Voltammetric Response Using Cyclic Voltammetrymentioning

confidence: 99%

Section: Voltammetric Response Using Cyclic Voltammetrymentioning

confidence: 99%

SYNTHESIS OF ACETIC ACID FROM ETHANOL BY ELECTROOXIDATION TECHNIQUE USING Ni-Cu-PVC ELECTRODE

Riyanto

Othman

Salimon

2017

AJSTD

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“…It is well known that the electroactivity of copper surfaces depends strongly on their morphology, surface area and structure, which would in turn depend on the method employed to prepare the electrode prior to electrochemical measurements. Hence, several studies have been reported in the literature on the use of copper surfaces aiming for the quantification of different species such as glucose, 1 carbohydrates, 2 ethanol, 3 nitrate, 4, 5 nitrite, 5 and sufite. 6 The electrochemical determination of nitrate after deposition of copper from solutions containing Cu(II) has been reported by some authors, 7,8 who examined qualitatively the morphology of the copper deposit by scanning electron microscopy (SEM) and atomic force microscopy (AFM).…”

Section: Introductionmentioning

confidence: 99%

Morphology, microstructure and electrocatalytic properties of activated copper surfaces

Gamboa

Petri

Benedetti

et al. 2012

J. Braz. Chem. Soc.

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Alterações morfológicas em superfícies de cobre resultantes da aplicação de um protocolo definido de potencial foram examinadas por microscopia eletrônica de varredura (MEV) e microscopia de força atômica (AFM). Os resultados mostraram uma boa correlação entre o tempo empregado na ativação do eletrodo, microestrutura resultante e a atividade eletroquímica.Morphologic changes on copper surfaces upon applying an established potential protocol were examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results showed a good correlation between the time employed in the electrode activation and the resulting microstructure and electrochemical activity.Keywords: nitrite, copper electrode, activation process, SEM, AFM IntroductionThe deliberate manipulation of electrodic surfaces consists of an area of continuing interest, because this approach leads to an improvement in the ability to recognize molecules and carry out electron transfer processes at higher rates. Hence, one of the dominant subjects in electrochemistry is the attempt to control the chemical composition and morphological structure of the electrode surface to gain advantages in electroanalytical determinations. It is well known that the electroactivity of copper surfaces depends strongly on their morphology, surface area and structure, which would in turn depend on the method employed to prepare the electrode prior to electrochemical measurements. Hence, several studies have been reported in the literature on the use of copper surfaces aiming for the quantification of different species such as glucose, 1 carbohydrates, 2 ethanol, 3 nitrate, 4, 5 nitrite, 5 and sufite. 6 The electrochemical determination of nitrate after deposition of copper from solutions containing Cu(II) has been reported by some authors, 7,8 who examined qualitatively the morphology of the copper deposit by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The increased sensitivity for nitrate after the surface modification by deposition of the fresh copper layer was attributed to morphologic changes assessed through quantitative parameters such as roughness and porosity of the film. Our group reported a new procedure for the activation of copper surfaces using a potential protocol based on copper oxidation and subsequent reduction of generated copper ions. 9,10 Taking into account these findings and as an attempt to understand which surface parameters control the electrochemical activity, the present study aims to evaluate whether there is a quantitative correlation between the surface area of copper electrodes and their electrochemical properties. Accordingly, copper electrodes were activated for different periods of time to produce layers which were analyzed by SEM and AFM. Then, the electrochemical activity of each generated surface was evaluated towards the cathodic reduction of nitrite. To the best of our knowledge, this is the first time that such a quantitative approach is applied for copper electrodes. Experimental Chemicals a...

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“…Paixão et al reported use of amperometric detection on copper electrodes for the application in gasohol samples [6]. This was formerly developed for use in determination of ethanol in beverages [7]. Flow analysis techniques have also been applied in method development for ethanol analysis.…”

Section: Introductionmentioning

confidence: 99%

Quality control of gasohol using a micro-unit for membraneless gas diffusion

Muncharoen

Sitanurak²,

Tiyapongpattana³

et al. 2008

Microchim Acta

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This work describes development of a new spectrophotometric flow analysis technique suitable for monitoring of ethanol content in gasohol fuel. In this technique, the concept of membraneless gas-diffusion (MBL-GD) was applied with one-step aqueous extraction of gasohol (1:2 gasohol:water). Segments of aqueous extract and color developing reagent were allowed to flow into two separate channels in the MBL-GD device. Inside the device, ethanol vapor can diffuse across a small headspace between the two channels (donor and acceptor). Introduction of an air-segment behind the zone of acceptor reagent to stop dispersion of the colored zone has greatly improved the rapidity of analysis using this MBL-GD technique. Two methods were developed for quality control of gasohol by measuring ethanol content. Method I is suitable for direct calibration of E5 and E10. Method II is recommended for E20. These methods have high accuracy with good precision (% RSD: 1 to 4.9, n=45) and have a sample throughput of 26 samples h -1 . E10 samples were compared with analysis using a standard GC method.

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Amperometric determination of ethanol in beverages at copper electrodes in alkaline medium

Cited by 110 publications

References 30 publications

SYNTHESIS OF ACETIC ACID FROM ETHANOL BY ELECTROOXIDATION TECHNIQUE USING Ni-Cu-PVC ELECTRODE

SYNTHESIS OF ACETIC ACID FROM ETHANOL BY ELECTROOXIDATION TECHNIQUE USING Ni-Cu-PVC ELECTRODE

Morphology, microstructure and electrocatalytic properties of activated copper surfaces

Quality control of gasohol using a micro-unit for membraneless gas diffusion

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