Voltammetric detection of copper(II) at a carbon paste electrode containing an organically modified silica

Etienne, Mathieu; Bessière, J.; Walcarius, Alain

doi:10.1016/s0925-4005(01)00614-1

Cited by 128 publications

(91 citation statements)

References 26 publications

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“…The SBA-15 sample with larger pores (around 6 nm) was prepared according to the following procedure. A 8-g aliquot of the triblock copolymer EO 30 PO 70 EO 70 (Pluronic P123) was dissolved in 250-mL aqueous solution containing 1.9 M HCl, at about 38 8C, under stirring during 1 ± 2 h. Tetraethoxysilane (15.95 mL) was then added to this mixture, which was allowed to react in a polypropylene flask during 24 h at 38 8C, and then 2 days at 90 8C. The resulting white solid was filtered on buchner and dried at 60 8C; it is characterized by an average particle size of about 1 ± 2 mm.…”

Section: Preparation Of Mesoporous Silica Samples and Grafted Materialsmentioning

confidence: 99%

“…For preconcentration analyses, the working electrodes were made of carbon paste containing the organically modified silicas, and detection was performed by anodic stripping voltammetry in the differential pulse mode (50-mV modulation amplitude, 5-ms modulation time, and 50-mV s À1 scan rate). Chemically modified carbon paste electrodes were prepared as previously described [30], with carefully mixing 60% high purity graphite (Ultra F, 200 mesh, from AlfaJohnson Matthey), 30% paraffin wax (Fluka), and 10% of each grafted silica-based material. All potentials are referred to the Ag/AgCl reference electrode.…”

Section: Electrochemical Instrumentationmentioning

confidence: 99%

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Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

et al. 2003

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This work reports the enhanced response of electrodes modified with ordered mesoporous silica-based materials, as compared to corresponding amorphous materials, in case of open-circuit accumulation and voltammetric detection of a target analyte. Several porous silica samples grafted with either thiol or ammonium groups, displaying high surface areas with various structural characteristics and different pore sizes, have been examined with respect to their ability to concentrate Hg II species. Better accessibility to the binding sites and faster diffusion processes in the interior of grafted silicas have been observed for the ordered samples prepared by micelle-templating because they contain channels of regular size, which are less tortuous than the irregular pore systems in amorphous materials. When applied in electrochemical detection of Hg II after preconcentration, the ordered solids gave rise to voltammetric signals higher by more than one order of magnitude in comparison to the amorphous organically-modified silicas. This rather new class of materials, which can be easily produced as ordered organic-inorganic hybrids, is expected to improve the performance of silica-modified electrodes in various fields of electroanalysis.

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Section: Preparation Of Mesoporous Silica Samples and Grafted Materialsmentioning

confidence: 99%

Section: Electrochemical Instrumentationmentioning

confidence: 99%

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

et al. 2003

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“…They include polymers displaying complexation centers [7 ± 9] or ion exchange properties [10,11], clays [12 ± 14], zeolites [15,16], silicas [17 ± 19] or organically modified silicas [20,21], and various chelating reagents [22 ± 28]. A great majority of these modifiers were introduced into carbon paste, which constitutes a matrix of choice to prepare electrodes chemically modified with any as-synthesized material [5], while some attempts to immobilize the reactants directly on the surface of solid electrodes were also described.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

et al. 2003

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A new solid-phase extractant based on carnosine moieties covalently attached to a silica backbone (S-Car) was introduced into a carbon paste electrode (CPE), and the resulting modified electrode (S-Car-MCPE) was applied to the preconcentration and subsequent voltammetric quantification of copper(II). The electrode modifier was a solid organic-inorganic hybrid prepared by co-condensation of tetraethoxysilane with an organotri-ethoxysilane containing a carnosine dipeptide (b-alanyl-l-histidine) derivative. This hybrid material has propensity for binding Cu II species from aqueous solutions. The basic voltammetric characterization of S-Car-MCPE, previously loaded with Cu II , indicates clearly that its electrochemical activity requires desorption of the analyte out of the solid material prior to undergoing charge transfer. A two-step analytical procedure was then applied, involving the sequence ™accumulation at open-circuit ± voltammetric detection by anodic stripping differential pulse voltammetry∫. Both these steps have been optimized with respect to various experimental parameters (electrode composition, pH and composition of both detection and accumulation media, preconcentration time, detection mode, presence of interference). Linear response to copper(II) was found in the 5 Â 10 À8 M to 10 À6 M concentration range, with a detection limit estimated at 4 Â 10 À9 M (0.06 ppb). This new immobilization approach for peptide-based materials on electrode surfaces is promising for further developments of organic-inorganic hybrids in electroanalysis.

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“…24 According to the study of effect of pH, a strongly acidic medium was selected as better suitable for desorption described by following reaction:…”

Section: Effect Of Phmentioning

confidence: 99%

New Pb2+ carbon paste electrode based on organically modified silicate and its square wave anodic stripping voltammetric response for pretreated gasoline samples

Cardoso¹,

Fonseca²,

Marques³

et al. 2010

J. Braz. Chem. Soc.

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Este trabalho descreve um procedimento analítico para a determinação de íons chumbo (II) por voltametria de redissolução anódica de onda quadrada em amostra de gasolina pré-tratada e a avaliação de um eletrodo de pasta de carbono modificada com um material híbrido inorgânico-orgânico (aminopropil preso a uma rede de sílica (APSil) obtido via a rota sintética sol-gel) como um sensor eletroquímico. As condições ótimas de análise dos íons Pb 2+ foram as seguintes: a composição de APSil na pasta de carbono foi 40% (em massa); o pH da solução de deposição igual a 1,8; o potencial de acumulação igual -0,7 V vs. Ag/AgCl e o tempo de deposição de 600 s. No estudo de interferentes observou-se que somente a espécie Cu 2+ , presente em concentração cinco vezes maior interferiu significantemente na resposta de redissolução.An analytical procedure for determining Pb 2+ by square wave anodic stripping voltammetry in pretreated gasoline sample is described and a carbon paste electrode modified with a inorganicorganic hybrid material (aminopropyl linked to the silica network (APSil) obtained by the sol-gel method) was evaluated as an electrochemical sensor. The optimum conditions for the analysis of Pb

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Voltammetric detection of copper(II) at a carbon paste electrode containing an organically modified silica

Cited by 128 publications

References 26 publications

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

Grafted Silicas in Electroanalysis: Amorphous Versus Ordered Mesoporous Materials

Electrochemical Detection of Copper(II) at an Electrode Modified by a Carnosine–Silica Hybrid Material

New Pb2+ carbon paste electrode based on organically modified silicate and its square wave anodic stripping voltammetric response for pretreated gasoline samples

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