Chemical preconcentration and determination of copper at a chemically modified carbon-paste electrode containing 2,9-dimethyl-1,10-phenanthroline

Prabhu, Sunil; Baldwin, Richard P.; Kryger, Lars

doi:10.1021/ac00135a002

Cited by 141 publications

(54 citation statements)

References 18 publications

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“…Other class of mercury-free electrodes relies on chemical modifications for metal preconcentrations. Ligands may be immobilized on the electrode surfaces using conductive binders (e.g, carbon paste) [6][7][8][9]. However, these ligands are in loose association with the binders, thus degradation of the sensors due to depletion of the ligands during measurements can occur.…”

Section: Introductionmentioning

confidence: 99%

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Yantasee

Charnhattakorn

Fryxell

et al. 2008

Analytica Chimica Acta

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Electrochemical sensors have great potential for environmental monitoring of toxic metal ions in waters due to their portability, field-deployability and excellent detection limits. However, electrochemical sensors employing mercury-free approaches typically suffer from binding competition for metal ions and fouling by organic substances and surfactants in natural waters, making sample pretreatments such as wet ashing necessary. In this work, we have developed mercury-free sensors by coating a composite of thiol self-assembled monolayers on mesoporous supports (SH-SAMMS ™ ) and Nafion on glassy carbon electrodes. With the combined benefit of SH-SAMMS ™ as an outstanding metal preconcentrator and Nafion as an antifouling binder, the sensors could detect 0.5 ppb of Pb and 2.5 ppb of Cd in river water, Hanford groundwater, and seawater with a minimal amount of preconcentration time (few minutes) and without any sample pretreatment. The sensor could also detect 2.5 ppb of Cd, Pb, and Cu simultaneously. The electrodes have long service times and excellent single and inter-electrode reproducibility (5% RSD after 8 consecutive measurements). Unlike SAMMS ™ -carbon paste electrodes, the SAMMS ™ -Nafion electrodes were not fouled in samples containing albumin and successfully detected Cd in human urine. Other potentially confounding factors affecting metal detection at SAMMS ™ -Nafion electrodes were studied, including pH effect, transport resistance of metal ions, and detection interference. With the ability to reliably detect low metal concentration ranges without sample pretreatment and fouling, SAMMS ™ -Nafion composite sensors have the potential to become the next generation metal analyzers for environmental and bio-monitoring of toxic metals.

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Section: Introductionmentioning

confidence: 99%

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Yantasee

Charnhattakorn

Fryxell

et al. 2008

Analytica Chimica Acta

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“…[10][11][12] In recent years, various chemically modified electrodes have been used to determine copper. Many substances, such as alga, 10 N-phenylcinnamohydroxamix acid, 11 N-acetyl-1-cysteine, 12 10-phenan-throline, 13 cysteine, 14 natural ionic polysaccharides, 15 Sphagnum peat moss, 16 1,2-bis-methyl(2-aminocyclopentene-carbodithioate)ethane, 17 salicylidenea-mino-2-thiophenol, 18 diquinolyl-8,8′-disulfide, 19 polypyrrolepyrocatechol violet, 20 N-(2-hydroxybenzyl)chitosan 21 and tetraphenylporphyrin, 22 have been used to fabricate the CME for the determination of copper. However, most of these modifiers were used to produce chemically modified carbon paste electrodes (MCPE).…”

Section: Introductionmentioning

confidence: 99%

Differential Pulse Anodic Stripping Voltammetric Determination of Traces of Copper with a Tobramycin-Nafion Modified Electrode

Li¹,

Luo²,

Chen

2004

ANAL. SCI.

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“…At the high-concentration end, the experimental results seem to indicate that the surface becomes saturated at a concentration of Cu(I) above 10 µM. Baldwin et al 8 reported that 2,9-dimethyl-1,10-phenanthroline modified CPEs were saturated at a Cu(I) concentration above 50 µM. In this case, the saturated response was obtained at a lower Cu(I) concentration level, though the trend is essentially the same.…”

Section: Cu(ii) + Nh2oh + 2bqn + S03--nafion --~ [Cu(i)(bqn)2]mentioning

confidence: 89%

“…Baldwin and co-workers employed CPEs modified with 2,9-dimethyl-1,10-phenanthroline for the determination of trace amounts of copper(I). 8 Wang proposed a new strategy for electrode modification with a microorganism for the bioaccumulation and voltammetric quantitation of Cu(II).9 A modest detection limit (2 µM) was obtained for a 10 min accumulation time. CPE modified with a' cation-exchanger, Dowex CGC 241-sulfonated polystyrene was also studied by Wang et al 10 The proposed procedure exhibited good linearity for Cu(II) at micromolar concentration levels.…”

mentioning

confidence: 99%

Determination of Trace Amounts of Copper(I) with a Chemically Modified Carbon Paste Electrode

1992

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FinlandIn this paper, a new sensitive and selective differential pulse voltammetric method for the preconcentration and determination of copper(I) in an aqueous medium is proposed. A carbon paste electrode modified with Nafion and 2,2'-biquinoline is used for the accumulation of copper(I) from a dilute solution, followed by voltammetric quantification of the accumulated analyte. The electrochemical behavior of the accumulated analyte is characterized by cyclic voltammetry and differential pulse voltammetry. The surface of the modified electrode is renewed by holding the electrode at a positive potential (0.8 V (vs. SCE)) for a certain period of time. The factors, which influence the accumulation and electrochemical response, have been investigated. A detection limit of 1 nM was obtained following 2 min of accumulation time. For 10 accumulation/ determination/ renewal cycles with 50 nM Cu(I), the response could be reproduced with a 4.4% relative standard deviation. Satisfactory results were obtained for the determination of copper in a variety of biological samples.

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Chemical preconcentration and determination of copper at a chemically modified carbon-paste electrode containing 2,9-dimethyl-1,10-phenanthroline

Cited by 141 publications

References 18 publications

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Detection of Cd, Pb, and Cu in non-pretreated natural waters and urine with thiol functionalized mesoporous silica and Nafion composite electrodes

Differential Pulse Anodic Stripping Voltammetric Determination of Traces of Copper with a Tobramycin-Nafion Modified Electrode

Determination of Trace Amounts of Copper(I) with a Chemically Modified Carbon Paste Electrode

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