Novel polymer-modified electrodes for batch injection sensors and application to environmental analysis

Brett, Christopher M.A.; Fungaro, Denise Alves; Morgado, José Mário; Gil, M.H.

doi:10.1016/s0022-0728(99)00061-3

Cited by 61 publications

(77 citation statements)

References 24 publications

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“…This probably shows the different nature of the complexation phenomena and stability constants with the various metal ions. The influence of proteins was previously studied only at MFE and with polymer-coated MFEs, there usually being a positive effect of protein at low albumin concentrations [36,37].…”

Section: Unmodified Bi Film Electrodementioning

confidence: 99%

“…A polymer film is often used to protect the electrode surface from organic substances present in natural samples that adsorb at the electrode surface in this way diminishing the response to analyte [2,36,37]. It was found that the Nafion coating improves the response of Zn(II) and Cu(II) at low Triton X-100 concentrations.…”

Section: Nafion Modified Bi Film Electrodementioning

confidence: 99%

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Characterization and Application of Bismuth‐Film Modified Graphite‐Polyurethane Composite Electrodes

et al. 2010

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Bismuth films (BiF) deposited in situ on graphite-polyurethane composite electrodes were successfully used for the determination of Zn, Cd, Pb, Cu and Hg, simultaneously in acetate buffer solution pH 4.5 using square wave anodic stripping voltammetry. It is possible to determine metals reoxidized at potentials more negative and more positive than Bi using in situ deposited BiF; reoxidation was studied by electrochemical impedance spectroscopy. The BiFmodified electrode was applied to analyse tap water. The influence of surface-active compounds, Triton X-100 and bovine serum albumin, on the stripping of these metals was investigated; Nafion coatings did not significantly improve the performance.

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Section: Unmodified Bi Film Electrodementioning

confidence: 99%

Section: Nafion Modified Bi Film Electrodementioning

confidence: 99%

Characterization and Application of Bismuth‐Film Modified Graphite‐Polyurethane Composite Electrodes

et al. 2010

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“…This rather remarkable fact may be an artefact due to specific interactions of lead cations with detergent-type surfactants in the zone of the electrode surface at neutral pH values and demonstrates the extra care that may need to be taken for measuring lead levels. This interaction can give rise to an increase in lead stripping currents, as has been previously shown 8,11 . Two situations can be envisaged.…”

Section: Environmental Analysesmentioning

confidence: 55%

“…The combination of BIA with square wave anodic stripping voltammetry (SWASV) has been shown to be particularly advantageous for trace metal ions 5 . Polymer coatings have included Nafion 6 , poly(ester sulphonic acid) 7 and various mixtures of highly sulphonated polymers with Nafion 8 . Although specific benefits arise from the latter two types of coating, in terms of discrimination against potential interferents -mainly surfactants -for most cases Nafion is found to be sufficiently good.…”

Section: Introductionmentioning

confidence: 99%

Modified electrode voltammetric sensors for trace metals in environmental samples

Brett¹,

Fungaro²

2000

J. Braz. Chem. Soc.

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Eletrodos de filmes finos de mercúrio modificados com Náfion foram investigados para análise de traços de metais em amostras ambientais de águas e efluentes, pela combinação das técnicas de análise por injeção de fluxo descontínuo e de voltamentria de onda quadrada com redissolução anódica. O método, envolvendo injeção de cerca de 50 microlitros de amostras sem tratamento prévio sobre o eletrodo detector, apresenta resposta rápida. O bloqueio e o envenenamento do eletrodo são mínimos, como mostram os estudos com componentes tensoativos. Foi realizada uma comparação entre substratos de carbono vítreo e de rede de microeletrodos de fibra de carbono, com este último apresentando um pequeno aumento de sensibilidade. Como aplicação foram analisadas amostras de água de rio e de efluentes industriais, coletadas e digeridas em meio ácido para a determinação de íons zinco, cádmio, chumbo e cobre. Nafion -modified mercury thin film electrodes have been investigated for the analysis of trace metals in environmental samples of waters and effluent by batch injection analysis with square wave anodic stripping voltammetry. The method, involving injection over the detector electrode of untreated samples of volume of the order of 50 microlitres has fast response, blocking and fouling of the electrode is minimum as shown by studies with surface-active components. Comparison is made between glassy carbon substrate electrodes and carbon fibre microelectrode array substrates, the latter leading to a small sensitivity enhancement. Application to analysis of river water and industrial effluent for labile zinc, cadmium, lead and copper ions is demonstrated in collected samples and after acid digestion.

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“…Among various applications reported so far, the most widely described systems are with amperometric e.g. [3][4][5][6] and voltammetric [7][8][9][10][11][12][13][14][15][16] detection.…”

Section: Introductionmentioning

confidence: 99%

Batch-injection stripping voltammetry (tube-less flow-injection analysis) of trace metals with on-line sample pretreatment

Trojanowicz

Koźmiński

Dias³

et al. 2005

Talanta

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The most essential limitation of batch-injection analysis (BIA) methodology compared to other flow methods (CFA, FIA, SIA) is the lack of possibility of on-line sample processing in the measuring system. Some procedures of on-line sample pretreatment in BIA are possible by changing the plastic tip of the automatic micropipette used for sample injection into a flow-through reactor, e.g. by packing it with a bed of a solid sorbent. This concept is employed in the voltammetric stripping determinations of trace metals using a bed of commercial chelating resin Chelex-100. It was found that, besides the electrochemical preconcentration of analytes in the form of amalgams on the surface of mercury thin film electrodes, an approximately 10-fold additional preconcentration can be achieved on the packed sorbent bed by using different volumes of aspirated sample solution and eluent. This procedure allows also efficient elimination of some matrix effects.

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Novel polymer-modified electrodes for batch injection sensors and application to environmental analysis

Cited by 61 publications

References 24 publications

Characterization and Application of Bismuth‐Film Modified Graphite‐Polyurethane Composite Electrodes

Characterization and Application of Bismuth‐Film Modified Graphite‐Polyurethane Composite Electrodes

Modified electrode voltammetric sensors for trace metals in environmental samples

Batch-injection stripping voltammetry (tube-less flow-injection analysis) of trace metals with on-line sample pretreatment

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