Applicability of electroanalysis for monitoring oxalic acid (OA) concentration during its electrochemical oxidation

Araújo, Eliane Gonçalves de; Oliveira, Gustavo Rodrigues; Santos, Enilson Medeiros dos; Martínez‐Huitle, Carlos A.; Panizza, Marco; Fernandes, Nedja Suely

doi:10.1016/j.jelechem.2013.04.024

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…Nowadays, the development of electrochemical sensing tools for various applications is receiving great attention [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Due to their inherent specificity, rapid measurement procedures, high accuracy, high sensitivity and simplicity of preparation, these measuring devices allow monitoring of different species in a satisfactory way.…”

Section: Introductionmentioning

confidence: 99%

Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

et al. 2020

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This study aims to investigate the applicability of a hybrid electrochemical sensor composed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380 °C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyzing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples.

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Section: Introductionmentioning

confidence: 99%

Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

et al. 2020

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“…limit of detection, LOD , was estimated by using the method based on the standard deviation of regression 42: …”

Section: Resultsmentioning

confidence: 99%

Voltammetric Determination of Folic Acid Using a Graphite Paste Electrode

et al. 2014

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A simple differential pulse voltammetric method based on a graphite paste electrode (GPE) was developed for the quantitative determination of folic acid (FA) in tablets. The electrode exhibits a clear improvement of the current response. A linear response in the electroanalytical approach exists from 4.97×10−6 to 2.94×10−5 mol L−1 with a limit of detection of about 2.67×10−6 mol L−1 in KCl solutions. The developed procedure was tested by recovery studies and compared with spectrophotometric and chromatographic methods. The results are described and discussed in the light of existing literature.

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“…Anodic oxidation uses electrons under mild operating conditions, and the process is amenable to automatic control. Previous studies on anodic oxidation of OA − have focused on the effect of the anode material on the rate of OA demineralization. Little work , has been done on the role of cell design in OA oxidation.…”

Section: Introductionmentioning

confidence: 99%

Demineralization of Oxalic Acid Solutions by Anodic Oxidation in a Stirred Tank Electrochemical Reactor: Experimental and Modeling Study

El Gheriany,

Abdel-Aziz,

El-Ashtoukhy

et al. 2024

Ind. Eng. Chem. Res.

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This study investigates the anodic oxidation of oxalic acid (OA) in wastewater by focusing on a stirred tank electrochemical reactor with a low-cost lead anode. The reactor design, which features a circular array of vertical lead cylinders, aims to enhance the current distribution and mass transfer. Response surface methodology (RSM) is employed to systematically explore the impact of the impeller rotation speed, current density, and initial OA concentration on the efficiency of OA removal. The investigation reveals that impeller rotation speed and current density significantly influence OA removal, while the initial OA concentration exhibits opposing effects. Notably, the study emphasizes the crucial role of contact time and reveals its significant influence on the overall process kinetics and adherence to first-order kinetics. The study also considers the role of sulfate ions in enhancing the electrochemical mineralization of OA. The derived empirical model provides insights into the interplay of operating parameters in influencing the oxidation kinetics. Additionally, the study employs RSM to optimize OA removal efficiency; in ideal circumstances, 96% of the acid was eliminated within a time frame of 2 h. Electrical energy consumed during electrolysis ranged from 2 to 11.4 kWh/kg contingent upon the specific operational parameters. The findings contribute to the design of efficient and environmentally friendly wastewater treatment processes for OA removal in diverse industrial applications. The merits of the present reactor compared with the traditional parallel plate cell are outlined.

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Applicability of electroanalysis for monitoring oxalic acid (OA) concentration during its electrochemical oxidation

Cited by 12 publications

References 24 publications

Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

Voltammetric Determination of Folic Acid Using a Graphite Paste Electrode

Demineralization of Oxalic Acid Solutions by Anodic Oxidation in a Stirred Tank Electrochemical Reactor: Experimental and Modeling Study

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