Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes

Shiu, Kwok-Keung; Shi, Kang

doi:10.1002/(sici)1521-4109(199810)10:14<959::aid-elan959>3.3.co;2-o

Cited by 5 publications

(11 citation statements)

References 14 publications

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“…After 10±15 cycles, there was little change in the voltammetric response. Similar results were also observed for the determination of Cu 2 and PB 2 species at PGCE [27].…”

Section: Adsorption Of Vitamin B 2 On Activated Glassysupporting

confidence: 86%

“…It is generally accepted that the number of active adsorption sites increases with the preanodization time [15,26,27]. The increase in saturation adsorption resulted from the increase in adsorption sites.…”

Section: Effects Of Activation Methodsmentioning

confidence: 99%

“…This suggested that selective determination of VB 2 species could be attained in the presence of most common vitamins. In addition, inorganic cations did not show signi®cant effects because the uptake of organic cations were usually inef®cient in such strong acid solution [27].…”

Section: Interferencementioning

confidence: 99%

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Selective Determination of Vitamin B2 at Electrochemically Activated Glassy Carbon Electrode

Shiu¹,

Shi²,

Shi³

2000

Electroanalysis

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Electrochemically activated glassy carbon electrodes were applied to the preconcentration and electroanalysis of Vitamin B 2 (VB 2 ) in multivitamin preparation. Voltammetric peak currents resulting from VB 2 species adsorbed on activated electrodes showed linear response for VB 2 concentrations in the range between 0.1 and 3.0 mM with a large slope of 12.2 A M 71 and a correlation coef®cient of 0.996. The reproducibility of the voltammetric measurements was usually less than 7 % RSD for ®ve replicate measurements. Common vitamin and metal species did not interfere in the determination.

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“…After 10±15 cycles, there was little change in the voltammetric response. Similar results were also observed for the determination of Cu 2 and PB 2 species at PGCE [27].…”

Section: Adsorption Of Vitamin B 2 On Activated Glassysupporting

confidence: 86%

Section: Effects Of Activation Methodsmentioning

confidence: 99%

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Selective Determination of Vitamin B2 at Electrochemically Activated Glassy Carbon Electrode

Shiu¹,

Shi²,

Shi³

2000

Electroanalysis

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“…The well-polished electrode was cycled in a 0.1 M H 2 SO 4 solution for five times in the potential range from 0 to 2 V. It is believed that the anodization of the GC surface results in a multilayer oxide film having OH groups [21]. The effects of electrochemical activation of the GC electrode surface were previously studied with XPS [22]. The activated electrode was dipped into a 0.5 M MPS/EtOH solution for four hours.…”

Section: Preparation Of the Modified Electrodementioning

confidence: 99%

Square-Wave Voltammetric Detection of Dopamine at a Copper-(3-Mercaptopropyl) Trimethoxy Silane Complex Modified Electrode

et al. 2005

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Square-wave voltammetric detection of dopamine was studied at a copper (Cu)-(3-mercaptopropyl) trimethoxy silane (MPS)-complex modified electrode (Cu-MPS). The modification of the electrode was based on the attachment of MPS onto an electrochemically activated glassy carbon electrode (GCE) by the interaction between methoxy silane groups of MPS and surface hydroxyl groups and followed by the complexation of copper with the thiol groups of MPS. The surface of the modified electrode was further coated by a thin layer of Nafion film. The surface of the Nafion coated MPS-Cu complex modified electrode (Nafion/Cu-MPS) was characterized using cyclic voltammetry, electrochemical quartz crystal microbalance (EQCM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FT-IR) spectrometry. The modified electrode exhibited an excellent electrocatalytic activity towards the oxidation of dopamine, which was oxidized at a reduced potential of þ 0.35 V (vs. Ag/AgCl) at a wider pH range. Various experimental parameters, such as the amount of copper, the pH, and the temperature were optimized. A linear calibration plot was obtained in the concentration range between 8.0 Â 10 À8 M and 5.0 Â 10 À6 M and the detection limit was determined to be 5.0 Â 10 À8 M. The other common biological compounds including ascorbic acid did not interfere and the modified electrode showed an excellent specificity to the detection of dopamine. The Nafion/Cu-MPS modified electrode can be used for about 2 months without any significant loss in sensitivity.

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“…16 The most common pretreatment methods include mechanical polishing and electrochemical polarization. 22 Shi et al 23 reported that aromatic cations and neutral species showed weak adsorption at a bare GCE, but adsorbed strongly at an EPGCE, for example dopamine, 24 1,4-naphthoquinone, riboavin, ferrocene, nitrobenzene, 25 and hydroquinone. 18 Furthermore, according to ref.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of the insecticide pymetrozine at an electrochemically pretreated glassy carbon electrode and its analytical application

et al. 2015

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A simple and sensitive electrochemical method for the determination of the insecticide pymetrozine was proposed using a simple electrochemically pretreated glassy carbon electrode (EPGCE). Compared with the bare GCE, the electrochemical response signal of pymetrozine at the EPGCE showed a significant increase. The electrochemical behavior of pymetrozine was investigated systematically and some dynamics were investigated in detail for the first time. The results indicate that the reaction of pymetrozine on the EPGCE is a two electron and two proton process, which is controlled by both diffusion and adsorption. Under optimum conditions, a good linear relationship was obtained between peak currents and pymetrozine concentrations in the range of 1 Â 10 À7 to 5 Â 10 À6 mol L À1 with a detection limit of 8 Â 10 À8 mol L À1 (S/N ¼ 3). The proposed method was applied to the determination of pymetrozine in real samples with satisfactory recovery results. Finally, the degradation of pymetrozine was also studied in natural soil.Scheme 1 Chemical structure of pymetrozine.

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Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes

Cited by 5 publications

References 14 publications

Selective Determination of Vitamin B2 at Electrochemically Activated Glassy Carbon Electrode

Selective Determination of Vitamin B2 at Electrochemically Activated Glassy Carbon Electrode

Square-Wave Voltammetric Detection of Dopamine at a Copper-(3-Mercaptopropyl) Trimethoxy Silane Complex Modified Electrode

Electrochemical behavior of the insecticide pymetrozine at an electrochemically pretreated glassy carbon electrode and its analytical application

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