Cathodic adsorptive stripping voltammetric determination of uranium (VI) complexed with 2, 6-pyridinedicarboxylic acid

Gholivand, Mohammad Bagher; Nassab, H. Rashidi; Fazeli, Hamed

doi:10.1016/j.talanta.2004.05.019

Cited by 40 publications

(13 citation statements)

References 19 publications

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“…It achieves such fine levels of detection by combining an accumulation process with a voltage scanning measurement. 1,2 The universal working electrodes for stripping analysis are hanging mercury drop electrodes (HMDE) and electrochemically generated mercury film electrodes (MFE). 3 Recently, because of mercury toxic effects, there has been a growing interest in the use of chemically modified electrodes (CME) for trace metal stripping analysis.…”

Section: Introductionmentioning

confidence: 99%

“…With this process, accumulation usually occurs by reactions between an analyte and an immobilized modifier at the electrode surface. [1][2][3][4][5] Electrically conducting polymers (ECPs), such as polypyrrole (PPy), can be used for the immobilization of complexing reagents for trace metal complexation/accumulation with voltammetric detection of the complexed metal. 6,7 Numerous anionic ligands have been incorporated into a PPy matrix as functional dopants for the stripping analysis of metal ions.…”

Section: Introductionmentioning

confidence: 99%

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Overoxidized Polypyrrole Doped with 4,5-Dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene Disulfonic Acid as a Selective and Regenerable Film for the Stripping Detection of Copper(II)

Mohadesi

Taher

2007

ANAL. SCI.

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Stripping voltammetry is a very sensitive method for the determination of many traces of metal ions and organic compounds. It achieves such fine levels of detection by combining an accumulation process with a voltage scanning measurement. 1,2 The universal working electrodes for stripping analysis are hanging mercury drop electrodes (HMDE) and electrochemically generated mercury film electrodes (MFE). 3 Recently, because of mercury toxic effects, there has been a growing interest in the use of chemically modified electrodes (CME) for trace metal stripping analysis. With this process, accumulation usually occurs by reactions between an analyte and an immobilized modifier at the electrode surface. [1][2][3][4][5] Electrically conducting polymers (ECPs), such as polypyrrole (PPy), can be used for the immobilization of complexing reagents for trace metal complexation/accumulation with voltammetric detection of the complexed metal.6,7 Numerous anionic ligands have been incorporated into a PPy matrix as functional dopants for the stripping analysis of metal ions. 8 The preparation of these functional PPy films is very simple, controllable and reproducible by electrochemical oxidizing pyrrole monomers in the presence of the target anionic reagents. 9 However, a major limitation lies in the high background currents typically encountered with modified PPy films. These currents mask the relatively smaller metal-chelate binding, thereby making metal detection difficult. 10One solution of this problem is to overoxidize PPy via the application of a high anodic potential in high-pH medias. [11][12][13] In the following section we present the ability of overoxidized polypyrrole (OPPy) film doped with an anionic complexing ligand, 4,5-dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene disulfonic acid (SPADNS, Fig. 1), to preconcentrate Cu(II) ions. SPADNS is an anion, and can thus be incorporated into a growing polycationic PPy film, and can also preconcentrate copper ions at an electrode surface by complexation. Experimental ChemicalsPyrrole (Fluka) was distilled under reduced pressure before use. SPADNS three sodium salt (Aldrich) was used as received. Other reagents were purchased from Merck and were of analytical grade. All aqueous solutions were prepared with double-distillated water. ApparatusElectrochemical measurements were made with a Metrohm multipurpose instrument Model 757. Working electrodes were 3 mm diameter platinum disks constructed in-house. The counter electrode was a platinum wire and the reference electrode was Ag/AgCl, both from Metrohm. A Metrohm pH meter, Model 710, was used for pH measurements. Film preparationPPy/SPADNS films were prepared potentiostatically by holding the potential at +0. Department of Chemistry, Shahid Bahonar University of Kerman, P. O. Box 76175-133, Kerman, IranA conducting polymer modified electrode based on the incorporation of 4,5-dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene disulfonic acid, SPADNS, as an anionic complexing ligand into polypyrrole film during electropolymerizati...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overoxidized Polypyrrole Doped with 4,5-Dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene Disulfonic Acid as a Selective and Regenerable Film for the Stripping Detection of Copper(II)

Mohadesi

Taher

2007

ANAL. SCI.

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“…Compared to the other elements like Cu, Zn, Pb and Cd these aspects were studied more rigorously. Therefore determination of uranium is of immense importance in relation to the nuclear industry, environment [1][2][3] and also from a geochemical view point. Many methods for determination of uranium at various levels were reported but electrochemical methods provide simpler and cost effective analysis without any prior separation [4,5].…”

Section: Introductionmentioning

confidence: 99%

Stripping Voltammetric Determination of Uranium in Water Samples Using Hg-Thin Film Modified Multiwall Carbon Nanotube Incorporated Carbon Paste Electrode

Sahoo¹,

Satpati²,

Reddy³

2013

AJAC

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The variables affecting determination of ultra trace levels of uranium (VI) in aqueous samples by differential pulse cathodic stripping voltammetry were examined in detail using Hg-thin film modified carbon paste and multiwall carbon nanotube (MWCNT) incorporated carbon paste electrode. Carbon paste electrode prepared in the laboratory was modified with Hg thin film and used as the working electrode. MWCNT was incorporated into the carbon paste for enhancement in sensitivity of the measurements. Electrochemical response for the uranium (VI) reduction peak was found to be well resolved on the thin mercury film modified carbon paste surface and also with the MWCNT modification. Characteristics of the adsorption preconcentration process were investigated using electrochemical impedance measurements. Electrochemical signals were observed to be enhanced on MWCNT modification of the carbon paste.

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“…With this process, accumulation usually occurs by reactions between an analyte and an immobilized modifier at the solid state electrode surface. 3,4 Electrically conducting polymers (ECPs), such as polyaniline or polypyrrole (PPy), can be used for the immobilization of complexing reagents for trace metal complexation/accumulation with voltammetric detection of the complexed metal ion. 5,6 The application of anionic ligands as functional dopant incorporated into a PPy matrix for the stripping analysis of metal ions has been reviewed.…”

Section: Introductionmentioning

confidence: 99%

Stripping voltammetric determination of copper (II) on an overoxidized polypyrrole functionalized with Nitroso-R

Mohadesi¹,

Salmanipour²,

Mohammadi³

et al. 2008

J. Braz. Chem. Soc.

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No presente trabalho é apresentado um método para a determinação de Cu em amostras de cabelo humano e água por voltametria de redissolução anódica de pulso diferencial. Foi provado que a eletropolimerização do pirrol ocorre em presença do ânion dopante Nitroso-R. O polipirrol dopado com Nitroso-R foi deposido sobre a superfície da platina, e reage com Cu(II) em pHs neutros, originando um complexo. Essa complexação entre o Nitroso-R e o Cu(II) produz o acúmulo de Cu(II) na superfície a partir de a circuito aberto. O eletrodo resultante com Cu(II) complexado foi então transferido para um tampão de acetato, e submetido a voltametria de redissolução anódica, promovendo o aparecimento de um pico de corrente a +0,08 V. Depois da avaliação do comportamento funcional analítico foi construído um gráfico de calibração a partir de 1,2 a 243,9 ng mL -1 e o limite de detecção foi de 0,7 ng mL -1 . O método foi utilizado para a determinação de íons cobre em amostras de água e cabelo humano. Os resultados indicam a capacidade do método para a determinação deste íon em amostras reais. Além disso, a rápida e conveniente regeneração do eletrodo permite sua utilização em várias análises.In the present paper a method for the determination of Cu in human hair and water samples by differential pulse anodic stripping voltammetry is presented. It has been proven that pyrrole electropolymerizes in present of Nitroso-R as dopant anion. Nitroso-R doped in polypyrrole film coated on platinum surface then reacts with Cu(II) in neutral pHs giving rise to a complex. This complexation between Nitroso-R and Cu(II) achieves the accumulation of Cu(II) from the sample solutions to the electrode surface at open circuit condition. The resulting electrode with complexed Cu(II) can then transfer to an acetate buffer and subject to anodic stripping voltammetry which promotes the appearance of a peak at +0.08 V. After the evaluation of the analytical performance a calibration graph was constructed from 1.2 to 243.9 ng mL -1 and the detection limit was 0.7 ng mL -1 . The method was used for determination of copper ions in water and human hair samples. The results indicate the ability of method for the determination of this ion in real samples. Also, the rapid and convenient regeneration of electrode allows the use of a single modified electrode in multiple analyses.

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Cathodic adsorptive stripping voltammetric determination of uranium (VI) complexed with 2, 6-pyridinedicarboxylic acid

Cited by 40 publications

References 19 publications

Overoxidized Polypyrrole Doped with 4,5-Dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene Disulfonic Acid as a Selective and Regenerable Film for the Stripping Detection of Copper(II)

Overoxidized Polypyrrole Doped with 4,5-Dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene Disulfonic Acid as a Selective and Regenerable Film for the Stripping Detection of Copper(II)

Stripping Voltammetric Determination of Uranium in Water Samples Using Hg-Thin Film Modified Multiwall Carbon Nanotube Incorporated Carbon Paste Electrode

Stripping voltammetric determination of copper (II) on an overoxidized polypyrrole functionalized with Nitroso-R

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