A choice of optimal surface modifier of carbon electrodes for mercury determination by stripping voltammetry

Романенко, С. В.; Ларина, Л. И.

doi:10.1016/j.jelechem.2005.06.007

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…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%

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%

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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“…All countries developed relevant standards about the mercury content present in the air, water and industrial wastewater emissions and the human intake of mercury, so it has important significance for both environmental protection and life science research to establish a method of rapid determination of mercury. Currently, methods of determining mercury(II) are variety, such as voltammetric method 1 , chromatographic method 2 , inductively coupled plasma atomic emission spectrometric method 3,4 , cold vapor atomic absorption spectrometric method 5 , atomic fluorescence spectrometry method 6 and spectrophotometric method, etc. Atomic absorption spectrophotometric method has highly sensitivity and selectivity, but it requires special and expensive instruments and devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a New Reagent 1-(4-Antipyrine)-3-(3-nitroaniline)triazene and Its Colour Reaction with Mercury(II)

Zhu¹,

Chen²

2013

Asian J. Chem.

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“…Mercury is one of the main heavy metals hazardous to humans; all countries developed relevant standards about the mercury content on the air, water and industrial wastewater emissions and the human intake of mercury, so it has important significance for both environmental protection and life science research to establish a method of rapid determination of mercury. Currently, methods of determining Mercury (Ⅱ) are variety, such as Voltammetric method [1], chromatographic method [2], inductively coupled plasma atomic emission spectrometric method [3][4], cold vapor atomic absorption spectrometric method [5], atomic fluorescence spectrometry method [6] and spectrophotometric method and so on. Atomic absorption spectrophotometric method has highly sensitivity and selectivity, but it requires special and expensive instruments and devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 1-(4-Antipyrine)-3-(3-Nitroaniline)-Triazene and its Color Reaction with Mercury(II)

Chen¹,

Xing

2012

AMR

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The synthesis of a new triazene reagent 1-(4-antipyrine)-3-( 3-nitroaniline)-triazene (ANTA) and its color reaction with Hg (Ⅱ) was studied and a new spectrophotometric method for the determination of Hg (Ⅱ) was established. The results showed that in the presence of micromulsion Tween-80, ASTA could reacted with Hg ( Ⅱ) to form a red stable complex of which the molar ratio of reagent︰metal was 2︰1 in Na2B4O7-NaOH medium.. The maximum absorption peak of the complex was located at 495 nm with the apparent molar absorption of 3.8 ×105 L·mol-1·cm-1. Beer′s law was obeyed in the range of 0.32～10 μg/10 mL for Hg ( Ⅱ) and the detection limit was 0.10 mg/L. Many ions did not interfere the colour reaction system due to the existence of ammonia. This method was applied to determination of Hg (Ⅱ) in lead-zinc ore samples, and the results were in accordance with those obtained by AAS method. Recovery was in the range of 103.0～103.2 % and the RSD(n=6) was not more than 4.6%.

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A choice of optimal surface modifier of carbon electrodes for mercury determination by stripping voltammetry

Cited by 7 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)

Synthesis of a New Reagent 1-(4-Antipyrine)-3-(3-nitroaniline)triazene and Its Colour Reaction with Mercury(II)

Synthesis of 1-(4-Antipyrine)-3-(3-Nitroaniline)-Triazene and its Color Reaction with Mercury(II)

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