Electroanalysis of copper species at polypyrrole-modified electrodes bearing alizarin red S ligands

Shiu, Kwok Keung; Chan, Oi Yin

doi:10.1016/0022-0728(94)03802-a

Cited by 82 publications

(7 citation statements)

References 13 publications

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“…A very large slope of 54.4 A/M and a correlation coefficient of 0.994 were obtained for the linear portion. Our previous study employing polypyrrole modified electrodes bearing alizarin red S in copper analysis gave a linear range from 10 to 80 mM [31] and the reproducibility was found to be larger than 10 % RSD, which indicated that the present application of PGCE in electroanalysis of copper was more sensitive and reproducible.…”

Section: Concentration Dependence Of Electroanalytical Responsementioning

confidence: 73%

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

Shiu

Shi

1998

Electroanalysis

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Electrochemically activated glassy carbon electrodes were applied to the preconcentration and electroanalysis of metal species. Activated glassy carbon electrodes were obtained by potentiostatic oxidation at þ2.0 V in 0.5 M sulfuric acid. Copper species were readily extracted onto the modified electrode and were determined electrochemically. Voltammetric peak currents showed linear response for copper concentrations in the range between 1 to 20 mM with a large slope of 2.11 A M ¹1 and a correlation coefficient of 0.997. The reproducibility of the voltammetric measurements was found to be within 7 % RSD for five replicate measurements on copper concentration of 10 mM. The modified electrodes could be applied for repeated copper determinations without appreciable deterioration in electrode response. Results suggest that the preconcentration of copper species onto activated electrodes involved primarily cation-exchange interactions with the surface graphite oxide film.

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Section: Concentration Dependence Of Electroanalytical Responsementioning

confidence: 73%

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

Shiu

Shi

1998

Electroanalysis

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“…It has been incorporated into polypyrrole-modified electrodes to the electrochemical analysis of Cu (I) and Cu (II) [13] . Recently, The behavior of alizarin red S adsorbed on electrochemically pretreated glassy carbon electrode, has been investigated by Shui et al [14] .…”

Section: Introductionmentioning

confidence: 99%

The Application of Electrochemical Impedance Techniques in Analyzing the AC Response of Some Two-electron Transfer Dye Systems

Rashwan¹

2005

American J. of Applied Sciences

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Abstract:The Electrochemical Impedance Spectroscopic techniques (EIS) were used to investigate the behavior of some dye compounds (quinoid systems) characterized with 2e-transfer processes. For this purpose, Alizarin Red S (ARS), Alizarin Cyanine (AC), Alizarin Viridin (AV) and carminic acid were chosen for the measurements. The EIS experiments were performed using a small AC amplitude (10 mV p-p) in addition to a relatively wide frequency range (0.01 Hz ≤ f ≤ 10 5 Hz). The investigations were carried out at room temperature in aqueous media (HClO 4 , NaClO 4 and KNO 3 ) on the Hanging Mercury Drop Electrode (HMDE) and for comparison one experiment only was measured in aprotic solvent (DMF) on the Pt-disc electrode. The EIS diagrams of these systems were characterized in the complex plane by two fundamental observations, the first of which is a straight line crossing the real axis at an angle of 45 o (or at least nearly so) and the second one is two semicircles beside each other corresponding to high-frequency and low-frequency regions, which are implying the presence of wellseparated time constants. The EIS characteristic parameters for these dye systems were calculated and discussed.

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“…It should be pointed out that copper adsorption was not observed at polished glassy carbon electrodes without electrochemical pretreatment. Interestingly, the reversibility of redox reactions involving the incorporated copper species was much better than those observed in our previous studies on polypyrrole modified electrodes bearing various ligands including ARS [24][25]. Figure 2b shows the corresponding response at an ARS-adsorbed electrode after exposure to copper solution.…”

Section: Preconcentration and Voltammetric Behavior Of Copper Speciesmentioning

confidence: 47%

“…We have previously incorporated ARS into polypyrrole-modified electrodes to electroanalyze Cu þ and Cu 2þ species [24][25]. In this study, we employed electrochemical preanodization to enhance the adsorption of ARS ligands on glassy carbon surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes Adsorbed with Alizarin Red S

Shiu

Song

1998

Electroanalysis

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Electrochemically activated glassy carbon electrodes adsorbed with alizarin red S (ARS) were applied to the electroanalysis of metal species. Copper species were readily extracted onto the ARS modified electrode and were determined electrochemically. Experimental results showed that the voltammetric peak current resulted from copper incorporation on ARS modified electrodes was significantly larger than that obtained on bare activated electrodes. Voltammetric peak currents showed linear response for copper concentrations in the range between 0.001 and 0.15 mM with a slope of 1.77 A M -1 (correlation coefficient: 0.998). The reproducibility of the voltammetric measurements was found to be within 10 % RSD for five replicate measurements on copper concentration of 0.10 mM. The modified electrodes could be applied for repeated copper determinations without appreciable deterioration in electrode response.

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Electroanalysis of copper species at polypyrrole-modified electrodes bearing alizarin red S ligands

Cited by 82 publications

References 13 publications

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

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

The Application of Electrochemical Impedance Techniques in Analyzing the AC Response of Some Two-electron Transfer Dye Systems

Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes Adsorbed with Alizarin Red S

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