Sonoelectrochemical Detection of Copper Within Industrial Effluent: A Critical Assessment

Davis, James A.; Cardosi, Marco F.; Brown, Ian; Hetheridge, Malcolm J.; Compton, Richard G.

doi:10.1081/al-100107302

Cited by 20 publications

(11 citation statements)

References 36 publications

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“…Second, ultrasound can provide in situ electrode depassivation, via surface cavitational activity preventing fouling species from passivating the electrode surface. This has been exemplified through the determination of copper in blood [30], lead in saliva [31] and copper in effluent [32].…”

Section: Introductionmentioning

confidence: 99%

Sonoelectroanalytical Detection of Ultra‐Trace Arsenic

2005

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The electroanalytical detection of arsenic on a gold electrode is investigated in the presence and absence of ultrasound. It is found that under quiescent conditions a detection limit of 1.8 Â 10 À7 M is achievable using a 120 seconds accumulation period. Applying optimised ultrasound during the accumulation period was found to reduce the limit of detection to 1 Â 10 À8 M from using a deposition period of 60 s at À 0.5 V, while increasing the sensitivity by a factor of 15. The methodology was tested on a river sample containing significant copper contamination and electrode passivating organic materials. This technique provides promise for in the field measurements due to the electrodedepassivating effects of ultrasound.

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Section: Introductionmentioning

confidence: 99%

Sonoelectroanalytical Detection of Ultra‐Trace Arsenic

2005

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“…Chloride stabilises the Cu I state leading to splitting of the stripping signal and a nonlinearity in its response to the concentration of Cu II present in solution. Davis [18] et al suggest-rather than attempting to eliminate all trace chloride-to add a large excess of chloride. Although this produces a constant splitting of the stripping signal and a resultant reduction in the Cu II stripping peak, the peak height is then found to increase linearly with concentration and the voltammogram is reproducible.…”

Section: IImentioning

confidence: 98%

A New Method for the Study of Processes at the Liquid–Liquid Interface Using an Array of Microdroplets on a Au Electrode

et al. 2006

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We report the fabrication of partially blocked gold electrodes, with regularly and hexagonally spaced inert hydrophobic blocks on their surface. The hydrophobic blocks, with diameters of 5 mum, are used to support liquid 5-nonyl-salicylaldoxime (Acorga-P50) droplets on the surface. By voltametrically monitoring the transport-controlled reduction rate of Cu(II) (in pH 5 solution) at the unblocked part of the gold surface it is possible to deduce, via simulation, the parameters controlling the rate of uptake of Cu(II) at the droplet-aqueous solution interface as the droplet "fills up" with Cu(II). Experimentally, it is recorded that the reduction current increases until the droplet is filled completely; after this, there is no further noticeable effect of the droplet coating. A rigorous theoretical analysis of the transients permits the deduction of partition coefficients between the aqueous solution and the organic-droplet phase and of diffusion coefficients within the droplet. The partition coefficient for Cu(II) between water and 5-nonyl-salicylaldoxime was found to be 200 at 25 degrees C and the diffusion coefficient of Cu(II) inside the organic phase was determined to be 5 x 10(-11) cm2 s(-1).

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“…Addition of metal ions (40 ppm Bi 3+ , 2.5 ppm Co 2+ , 1 ppm Cd 2+ , 6 ppm Ni 2+ , 2 ppm Sb 2+ , 1 ppm Zn 2+ ) to solutions containing 25 ppb Cr(VI) induced a less than 5.0% current deviation. The interference concentration choice was based on literature values found for water samples [32][33][34]. Table 1 shows the …”

Section: Interferencementioning

confidence: 99%

Electrochemical synthesis of silver nanoparticles-coated gold nanoporous film electrode and its application to amperometric detection for trace Cr(VI)

Zheng

Yang

et al. 2011

Sci. China Chem.

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A simple and rapid approach for the electrochemical synthesis of Ag nanoparticles-coated gold nanoporous film (AgGNF) on a gold substrate was reported. The solid gold electrode (SGE) was directly anodized under a high potential of 5 V, and then reduced to obtain gold nanoporous film (AuNF) by freshly prepared ascorbic acid. The Ag nanoparticles (AgNPs) were grown on the AuNF electrode by potential-step electrodeposition. The resulting AgGNF composites electrodes were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and cyclic voltammetry (CV). As-prepared AgGNF electrode was used as a kind of superior sensor for Cr(VI) detection, which exhibited better electrocatalytic behavior than those of AuNF and SGE under identical conditions. Such a designed AgGNF nanocomposites electrode showed outstanding sensitivity (about 0.15 nA/ppb) and favorable reproducibility for Cr(VI) detection. The dependence of reduction current on Cr(VI) concentration is linear from 2 to 370 ppb with a low detection limit of 0.65 ppb. Interferences from other heavy metals ions (Cr 3+ , Cu 2+ , Pb 2+ , As 3+ and Hg 2+ ) associated with Cr(VI) analysis could be effectively diminished. The present method proves to be rapid, reliable, sensitive and low-cost.

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Sonoelectrochemical Detection of Copper Within Industrial Effluent: A Critical Assessment

Cited by 20 publications

References 36 publications

Sonoelectroanalytical Detection of Ultra‐Trace Arsenic

Sonoelectroanalytical Detection of Ultra‐Trace Arsenic

A New Method for the Study of Processes at the Liquid–Liquid Interface Using an Array of Microdroplets on a Au Electrode

Electrochemical synthesis of silver nanoparticles-coated gold nanoporous film electrode and its application to amperometric detection for trace Cr(VI)

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