Dc anodic stripping voltammetry at mercury thin film electrodes: the shape and position of the stripping peaks at hydrodynamic electrodes

Brett, Christopher M. A.; Brett, Ana Maria C.F. Oliveira

doi:10.1016/0022-0728(89)80013-0

Cited by 20 publications

(11 citation statements)

References 12 publications

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“…Finally, all stripping peaks show asymmetry in agreement with the results previously reported for the oxidation of metals deposited on solid electrodes . Previous studies report that asymmetry of the peak shape can also occur when the stripping is performed in convective conditions. , Though, the symmetry of the peaks did not improve by reducing or eliminating the flow rate, whereas a shift to less positive potentials of the oxidation peak was observed by increasing the flow rate.…”

Section: Resultssupporting

confidence: 90%

“…66 Previous studies report that asymmetry of the peak shape can also occur when the stripping is performed in convective conditions. 67,68 Though, the symmetry of the peaks did not improve by reducing or eliminating the flow rate, whereas a shift to less positive potentials of the oxidation peak was observed by increasing the flow rate. Collection Efficiency.…”

Section: Effect Of the Areal Mass On Capacitive Currentsmentioning

confidence: 92%

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Carbon Nanotube Based Flow-Through Electrochemical Cell for Electroanalysis

2016

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A flow-through electrode made of a carbon nanotubes (CNT) film deposited on a polytetrafluoroethylene (PTFE) membrane was assembled and employed for the determination of low concentration of copper as a model system by linear sweep anodic stripping voltammetry (LSASV). CNT films with areal mass ranging from 0.12 to 0.72 mg cm were characterized by measurement of sheet resistance, water permeation flux and capacitance. Moreover, CNT with two different sizes and PTFE membrane with two different pore diameters (0.45 and 5.0 μm) were evaluated during the optimization of the electrode. Thick layers made of small CNT exhibited the lowest sheet resistance and the greatest analytical response, whereas thin layers of large CNT had the lowest capacitance and the highest permeation flux. Electrodes made of 0.12 mg cm of large CNT deposited on 5.0 μm PTFE enabled sufficiently high mass transfer and collection efficiency for detecting 64 ppt of Cu(II) within 5 min of deposition and 4.0 mL min flow rate. The analytical response was linear over 4 orders of magnitude (10 to 10 M) of Cu(II). The excellent performance of the flow-through CNT membrane integrated in a flow cell makes it an appealing approach not only for electroanalysis, but also for the electrochemical treatment of waters, such as the removal of low concentrations of heavy metals and organics.

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Section: Resultssupporting

confidence: 90%

Section: Effect Of the Areal Mass On Capacitive Currentsmentioning

confidence: 92%

Carbon Nanotube Based Flow-Through Electrochemical Cell for Electroanalysis

2016

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“…Lecture presented at the International Symposium on New Trends in Electroanalytical Chemistry, Seoul, South Korea, 10-12 September, 1998. In a real situation, continuous on-line monitoring may be necessary, using detectors such as a wall-jet electrode [8], in which case electrode protection is extremely important. Contact time between sample and electrode can be reduced by the technique of batch injection analysis (BIA) [9 -11], which involves the injection of samples of volume 100 ml over the centre of an electrode immersed in electrolyte solution.…”

Section: Introductionmentioning

confidence: 99%

Novel polymer-modified electrodes for batch injection sensors and application to environmental analysis

Brett¹,

Fungaro²,

Morgado³

et al. 1999

Journal of Electroanalytical Chemistry

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Various polymer coatings have been investigated for the protection of mercury thin-film electrodes in the square wave anodic stripping voltammetry of environmental samples using batch injection analysis, with injection of untreated samples of volume 50 ml directly over the sensing electrode. Polymer coatings studied include those with controlled porosity, and cation-exchange polymers based on sulphonated polymers. Of the polymers tested, films of ca. 1 mm thickness made from Nafion ® mixed with 5% poly(vinyl sulphonic acid) were found to give the best results in tests with the model surfactants Triton-X-100 detergent, sodium dodecyl sulphate and protein standard. The validity of the approach is demonstrated by application to real samples.

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“…In anodic stripping voltammetry with convective flow this is due to hydrodynamic effects, since the metal ion product of the electrode reaction in the determination step is swept away from the region close to the surface of the wall-jet electrode into the bulk solution [13]. However, in adsorptive stripping voltammetry flow effects in the determination step are minimal since the reagent is adsorbed on the mercury surface and the product of the reduction reaction dissolves in the mercury film.…”

Section: Resultsmentioning

confidence: 99%

Square wave adsorptive stripping voltammetry of nickel and cobalt at wall‐jet electrodes in continuous flow

1996

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Square wave adsorptive stripping voltammetry (SWAdSV) of nickel and cobalt at wall-jet electrodes in a continuous flow system has been evaluated. Characteristics and advantages relative to differential pulse adsorptive stripping voltammetry (DPAdSV) in continuous flow systems are explored. Under optimized experimental conditions, sensitivity is approximately a factor of ten higher than DPAdSV, and onenanomolar detection limits are achieved. Solution deoxygenation is unnecessary and sample throughput is increased.

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Dc anodic stripping voltammetry at mercury thin film electrodes: the shape and position of the stripping peaks at hydrodynamic electrodes

Cited by 20 publications

References 12 publications

Carbon Nanotube Based Flow-Through Electrochemical Cell for Electroanalysis

Carbon Nanotube Based Flow-Through Electrochemical Cell for Electroanalysis

Novel polymer-modified electrodes for batch injection sensors and application to environmental analysis

Square wave adsorptive stripping voltammetry of nickel and cobalt at wall‐jet electrodes in continuous flow

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