Fast-scan a.c. voltammetry for better resolution of chromatographically overlapping peaks

Trojánek, Antonı́n; Jong, H.G. de

doi:10.1016/s0003-2670(01)95315-2

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…3 Electrochemical detection of 2-nitrophenol and other nitrophenols at a mercury electrode by scanning voltammetry in HPLC has been described. 4,5 The differential-pulse technique has been used in stripping voltammetry at a mercury electrode in a flow injection system. 6,7 Carbon paste electrodes have a wide range of anodic and cathodic utility and are inexpensive and easy to prepare and replace.…”

mentioning

confidence: 99%

Use of a Bentonite-modified Carbon Paste Electrode for the Determination of Some Phenols in a Flow System by Differential-pulse Voltammetry

Rodríguez¹,

Leyva²,

Cisneros³

1997

Analyst

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The electrochemical behaviour of some phenols (methyl-, chloro-and nitrophenols) included in the US Environmental Protection Agency List of Priority Pollutants at a bentonite-modified carbon paste electrode in a flow system was studied. A fixed proportion of artificial sea-water was used in the sample solution so that the applicability of the methodology to marine environments could be tested. Amounts of bentonite from 5 to 10% were used. For methyl-and nitrophenols, a good stability of the electrode surface activity was observed after a series of repeated injections, with relative standard deviations between 0.40 and 2.98% (n = 16). Recovery studies were carried out on real sea-water samples spiked with 0.5 or 2.5 mg l 21 of the pollutants; recoveries from 95.4 to 101.1% were obtained.

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confidence: 99%

Use of a Bentonite-modified Carbon Paste Electrode for the Determination of Some Phenols in a Flow System by Differential-pulse Voltammetry

Rodríguez¹,

Leyva²,

Cisneros³

1997

Analyst

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“…Such potential scan pulse measurements are especially useful with mercury electrodes where the charging current is the major background component (unlike other contributions at solid electrodes). Trojanek and De Jong [57] used fastscan, phase-selective ac voltammetry to improve the selectivity of HPLC detection. The potential was scanned over a selected range and only the maximal current of each scan was recorded.…”

Section: Measuring Techniqijesmentioning

confidence: 99%

Use of mercury drop electrodes for polarographic measurements in flowing solutions

Kubiak

1989

Electroanalysis

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“…In principle, phenols are well suited to electrochemical detection since they can be oxidized at a metal electrode; experimentally this has been a challenge due to strong passivation of electrode via polymerisation, 2,3 although HPLC with electrochemical 4 detection and cyclic voltammetry at a carbon paste electrode in flowing liquids 5 have been attempted. Electrochemical detection of phenolic compounds at a mercury electrode via scanning voltammetry in HPLC has also been described 6 and differentialpulse voltammetry has been used in stripping voltammetry at a mercury electrode in a flow injection system. 7 In the case of dropping mercury electrodes, reproducible results can be obtained but the use of this electrode material now gives environmental concern.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 6. The limiting currents as a function of volume flow rate for a 0.86 mM phenol aqueous solution at a laser intensity of 0.16 W cm22 .…”

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Laser activated voltammetry: application to the determination of phenol in aqueous solution at a glassy carbon electrode

Fulian

Compton

2000

Analyst

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Clean electrode surfaces can be achieved during the electrolysis of otherwise passivating species in aqueous and other solutions by means of surface ablation using a 10 Hz pulsed Nd+YAG 532 nm laser. This ability to remove passivating electrolytically generated layers on a glassy carbon electrode in a channel flow cell was shown by an investigation of the stripping peaks formed from the electrogeneration of the neutral forms of methyl viologen and heptyl viologen during reduction in aqueous solution of the corresponding di-cations. Next, laser ablation voltammetry was conducted for the oxidation of phenol in aqueous solution. Steady state voltammograms were obtained with well defined mass transport limited currents contrasting with the current peaks seen under dark scans where the formation of a polymerised layer on the electrode surface ultimately leads to electrode passivation under flow conditions. Square wave voltammetry was then used to detect phenol under no-flow conditions using a laser intensity of 0.1 W cm 22 . A linear dependence of the peak current on the concentration was found with a detection limit of phenol of 2 mM.

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Fast-scan a.c. voltammetry for better resolution of chromatographically overlapping peaks

Cited by 16 publications

References 15 publications

Use of a Bentonite-modified Carbon Paste Electrode for the Determination of Some Phenols in a Flow System by Differential-pulse Voltammetry

Use of a Bentonite-modified Carbon Paste Electrode for the Determination of Some Phenols in a Flow System by Differential-pulse Voltammetry

Use of mercury drop electrodes for polarographic measurements in flowing solutions

Laser activated voltammetry: application to the determination of phenol in aqueous solution at a glassy carbon electrode

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