voltammetry Articles
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The influence of copper ions on antioxidant activity: preliminary study
The influence of copper on the antioxidant activity of endogenous and exogenous radical scavenging systems has been evaluated by cyclic voltammetry. The results indicate that though this metal may increase antioxidant activity, this is sometimes combined with pro-oxidant activity, especially in the case of exogenous antioxidants, so that the final effect may not be as positive as expected, with ...
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Analysis of chromium and copper by cathodic stripping voltammetry with mixed ligands
Abstract Cathodic adsorptive stripping voltammetry is one of the most sensitive analytical methods for ultratrace analysis. The detection limit is usually lower than 10 -9 mol/L. Most adsorptive stripping procedures have been focused on the one ligand/one analyte approach. In order to reduce analysis time and sample volume, the possibility of simultaneously determining several metals by cathodic ...
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New insights in the dihydroxybenzenes-driven Fenton reaction: electrochemical study of interaction between dihydroxybenzenes and Fe(III)
It has been reported that the dihydroxybenzene (DHB) driven Fenton reaction is more efficient to degrade recalcitrant substrates than the simple Fenton reaction. The enhanced reactivity of the DHB driven Fenton reaction is not clear, but it could be explained by the formation of oxidant species different from the ones formed by classical Fenton reaction or by the shift of the redox potential of ...
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Electrochemical oxidation of aromatic sulphonated acids on a boron-doped diamond electrode
The electrochemical oxidation of an industrial wastewater containing aromatic sulphonated acids on a boron-doped diamond electrode (BDD) was studied using cyclic voltammetry and bulk electrolysis. The influence of the current density and flow-rate was investigated in order to find the optimum conditions. It was found that a polymeric film, which caused BDD deactivation, was formed in the ...
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Cyclic voltammetric studies for the electrochemical determination of palladium in high–level nuclear waste
Cyclic voltammetric studies of Pd(II)/Pd(0) electrode process were carried out on a Glassy Carbon Electrode (GCE) in HCl for the development of an Anodic Stripping Voltammetric (ASV) method for the determination of palladium in High–Level Nuclear Waste (HLNW). Pd(II) reduces electrochemically to Pd(0) in a wide potential range, depending upon the concentration of HCl. No significant effect of ...
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Sensitive quantification of trace zinc in water samples by adsorptive stripping voltammetry
A simple and sensitive adsorptive stripping voltammetry method was developed for determination of Zn using N-nitrozo-N-phenylhydroxylamine (cupferron) as a selective complexing agent. This complex absorbed on the hanging mercury drop electrode and created a sensitive peak current. The peak current and concentration of zinc accorded with a linear relationship in the range of 0.85–320 ng ...
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Simultaneous determination of Cd(II) and Cu(II) using stripping voltammetry in groundwater, soil and Alhagi maurorum plants in industrial and urban areas in Northern Border, Saudi Arabia with luminol as a chelating agent
The cathodic stripping voltammetry of Cu(II) and Cd(II) speciation was re-optimized by using luminol (Lu) in groundwater, soil and Alhagi maurorum plants, finding differences with the pre-existing method and a different interpretation for the electroactive species. The main findings are that optimum sensitivity is obtained at 0.3–142.5 ng/mL and 0.065–60.0 ng/mL for copper and cadmium, ...
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Simultaneous determination of Cd(II) and Cu(II) using stripping voltammetry in groundwater, soil and Alhagi maurorum plants in industrial and urban areas in Northern Border, Saudi Arabia with luminol as a chelating agent
The cathodic stripping voltammetry of Cu(II) and Cd(II) speciation was re-optimized by using luminol (Lu) in groundwater, soil and Alhagi maurorum plants, finding differences with the pre-existing method and a different interpretation for the electroactive species. The main findings are that optimum sensitivity is obtained at 0.3–142.5 ng/mL and 0.065–60.0 ng/mL for copper and cadmium, ...
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Double potential step chronocoulometric studies to determine the role of thiocyanate in electroanalytical determination of gallium in Pu-Ga and U-Ga alloys
Two rapid, selective and simple methods are developed for the determination of gallium in Pu-Ga and U-Ga alloys using Anodic Stripping Voltammetry (ASV) and Controlled Potential Coulometry (CPC). In continuation of this work, a detailed study is presented to determine the role of SCN− during the determination of gallium at Static Mercury Drop Electrode (SMDE) in NaClO4 and NaSCN mixed ...
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A comparison of electrochemical oxidation performance of PbO2 and SnO2 electrodes
PbO2 and SnO2 are two promising anode materials for electrochemical oxidation. In order to highlight the difference between two kinds of electrodes in an electrochemical oxidation process, their morphology, structural, oxygen evolution overpotential (OEP), electrochemical activity and service life-time were compared in detail in this paper. Surface characterization by scanning electron ...
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Designing PEDOT–based sensors for antioxidant analysis
Antioxidants play important roles in food quality and the protection and promotion of human health. The most commonly used antioxidant determination techniques are the Folin–Ciocalteu assay and HPLC analyses. However, these methods have various disadvantages such as long time requirements, low sensitivity, interfering agents etc. Cyclic voltammetry at inert electrodes is another method for ...
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Automated techniques for real-time shipboard determination of dissolved trace metals in marine surface waters
This review compares methods that are currently employed for shipboard analysis of trace metals in seawater voltammetric, chemiluminescence and colorimetric methods. Instrumentation and methods are described for collecting surface seawater using pumping, with subsequent on-line analysis by stripping voltammetry. The review is illustrated with data for oceanic and coastal distributions of ...
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Double potential step chronocoulometric studies to determine the role of thiocyanate in electroanalytical determination of gallium in Pu–Ga and U–Ga alloys
Two rapid, selective and simple methods are developed for the determination of gallium in Pu–Ga and U–Ga alloys using Anodic Stripping Voltammetry (ASV) and Controlled Potential Coulometry (CPC). In continuation of this work, a detailed study is presented to determine the role of SCN− during the determination of gallium at Static Mercury Drop Electrode (SMDE) in NaClO4 and NaSCN mixed ...
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Green alternative methods for voltammetric analysis in different water matrices
Mercury-free methods for determination of heavy metals in boiler feed, drinking, and sea water samples. Stripping voltammetry uses electrochemical sensors for the determination of heavy metal ions in different types of samples. These can include boiler feed water, drinking water, sea water, beverages, and even industrial samples like plating baths. Low detection limits (between ...
By Metrohm AG
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Biosorptive separation of 'labile' fractions of copper and lead from river sediments and evaluation by differential pulse, anodic stripping voltammetry
The 'labile' copper and lead metal contents of contaminated sediments were extracted in different chemical solutions and then subjected for biosorptive separations. The sorbents called 'AlgaSORB-sp' and 'AlgaSORB-ch' were derived from two different algae, viz., Spirogyra and Chlorella, respectively . The metal detection was made by differential pulse, anodic stripping voltammetry. The retention ...
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Electrochemical synthesis of polypyrrole for biosensor application
Polypyrrole nanowires were electrochemically synthesised on platinum electrode at ambient temperature. The potentiostatic potential was set at 0.75 V in the presence of gelatin as soft mould. The whole process only took few hundred seconds. The morphologies, chemical composition and conductivity of nanowires were evaluated by means of Scanning Electron Microscopy (SEM), Fourier Transform Infrared ...
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Effect of cathode electron acceptors on simultaneous anaerobic sulfide and nitrate removal in microbial fuel cell
The current investigation reports the effect of cathode electron acceptors on simultaneous sulfide and nitrate removal in two-chamber microbial fuel cells (MFCs). Potassium permanganate and potassium ferricyanide were common cathode electron acceptors and evaluated for substrate removal and electricity generation. The abiotic MFCs produced electricity through spontaneous electrochemical ...
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A voltammetric method for determining free metal activities in aqueous solutions. Part 2: anodic stripping voltammetry of Cd, Cu, Pb and Zn in synthetic and soil solutions
Theory and methodology for determining the free metal activity, (M2+), of Cd, Cu, Pb and Zn by anodic stripping voltammetry is presented. Metal-buffer solutions were prepared to control (M2+), which was varied by using different ligands and by changing pH. Total metal aqueous concentration of 10-6–10-7M and metal-ligand ratios of 1:20M, 0.010M acetate medium were used. Equations for reversible ...
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A voltammetric method for determining free metal activities in aqueous solutions. Part 1: direct current voltammetry of Cd, Cu, and Pb
A selective and sensitive method for determining free metal activities (M2+) for Cd, Cu and Pb in aqueous solutions is presented based on the Lingane and DeFord and Hume models. Electrochemical and complexation studies were carried out by direct current voltammetry (DCV) and by metal ion selective electrodes (ISE) as a reference method. A voltammetric equation was tested to evaluate (M2+) by ...
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New electrochemical sensor for sensitive quantification of copper in river, city, bottled and drinking water samples
In the present study, a reliable and very sensitive sensor for the determination of ultra-trace of Cu(II) is proposed. Copper was determined by anodic differential pulse stripping voltammetry based on the adsorption collection of the Cu(II) on an encapsulated Schiff base onto multiwalled carbon nanotube paste working electrode. The variation of peak current with pH and several instrumental ...
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