Copper determination in ethanol fuel by differential pulse anodic stripping voltammetry at a solid paraffin-based carbon paste electrode modified with 2-aminothiazole organofunctionalized silica

Takeuchi, Regina M.; Santos, André Luíz dos; Padilha, Pedro M.; Stradiotto, Nelson Ramos

doi:10.1016/j.talanta.2006.05.035

Cited by 103 publications

(64 citation statements)

References 26 publications

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“…In a previous work, 32 we demonstrated that SiAt-SPCPEs containing 40% (m/m) of solid paraffin, 40% (m/m) of carbon powder and 20% (m/m) of SiAt presented the best analytical performance for Cu 2+ quantification in commercial ethanol fuel samples. In this previous work, we observed that SiAt contents higher than 20% (m/m) decreased the peak current values due to the replacement of conductive carbon powder by SiAt which is an isolator.…”

Section: Study Of Operational Parametersmentioning

confidence: 84%

“…Solid paraffin is a very attractive binder agent introduced by Petit and Kauffman 41,42 and presents low cost and can be easily handled allowing electrode preparation in a simple and fast way. Recently, we demonstrated that SPCPEs are totally stable in ethanol media, which allowed their use for quantification of copper 32 and nickel 33 directly in commercial ethanol fuel samples. The attractive features of solid paraffin suggest that this binder agent is advantageous even for analytical applications in aqueous solutions.…”

Section: Preliminary Studiesmentioning

confidence: 99%

“…In our previous works, we determined copper 32 and nickel 33 in commercial ethanol fuel samples by anodic stripping differential pulse voltammetry. In these works, the preconcentration step was performed directly in the commercial ethanol fuel sample.…”

Section: Preliminary Studiesmentioning

confidence: 99%

“…Conventional silica (amorphous and silica gel) have also been used and it has allowed the reliable and low level quantification of Cu 2+ and Ni 2+ in ethanol fuel samples, [31][32][33] Hg 2+ and Cd 2+ in natural waters, 34,35 etc. An advantageous feature of conventional silica is the fact that they are commercially available at relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

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Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Silva¹,

Costa²,

Takeuchi³

et al. 2011

J. Braz. Chem. Soc.

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Um eletrodo de pasta de carbono preparado com parafina sólida como aglutinante e quimicamente modificado com sílica funcionalizada com grupos 2-aminotiazol foi empregado na quantificação simultânea de Pb 2+ e Cu 2+ em amostras de água por meio de voltametria de redissolução anódica. O presente método emprega um tempo curto de pré-concentração (180 s), o qual permitiu a quantificação simultânea e confiável de Pb 2+ e Cu 2+ de maneira bastante rápida. Foram obtidos limites de detecção de 7,3 e 90 nmol L −1 para Pb 2+ e Cu 2+ , respectivamente. Estes valores estão abaixo das concentrações máximas permitidas destes metais em água potável segundo a legislação brasileira, indicando que o método proposto é aplicável para o monitoramento de Pb 2+ e Cu 2+ em amostras de água. Estudos de recuperação foram realizados em quatro amostras de água enriquecidas, sendo obtidas porcentagens de recuperação próximas a 100% para todas as amostras analisadas, demonstrando a boa acuracidade do método proposto.A solid paraffin-based carbon paste electrode modified with 2-aminothiazole functionalized silica-gel was used for simultaneous quantification of Pb 2+ and Cu 2+ in water samples by anodic stripping voltammetry. The present method uses short preconcentration time (180 s), which allowed reliable and simultaneous quantification of Pb 2+ and Cu 2+ in a very fast way. Detection limits of 7.3 and 90 nmol L −1 were obtained for Pb 2+ and Cu 2+ , respectively. These values are below their maximum concentrations allowed in drinking water by Brazilian legislation, indicating that the proposed method is useful to monitoring Pb 2+ and Cu 2+ in water samples. Recovery studies were performed in four spiked water samples and the results shown recovery percentages close to 100% for all analyzed samples, demonstrating the good accuracy of the proposed method.Keywords: anodic stripping voltammetry, carbon paste electrode, 2-aminothiazolefunctionalized silica gel, lead and copper determination, water samples IntroductionEnvironmental contamination by heavy metals is a growing concern because they are very toxic, bioaccumulative and totally non-degradable. Therefore, environmental monitoring of heavy metals is of great importance for many reasons, such as identification of pollutant sources, understanding pollutant dissemination, anticipation of remediation procedures, etc. Copper and lead are two very important metallic pollutants because they are toxic and abundant. Contamination of natural waters by anthropogenic activities is one of the main ways to introduce heavy metals in the environment. Therefore, quantification of metallic ions in water samples is very important in order to preserve safe water resources for world population. In all regions around the world, legislative instruments are very restrictive regarding copper and lead contents in water for human consumption. In Brazil, for example, limits for Pb 2+ and Cu 2+ in drinking water are 0.01 mg L −1 (48 nmol L −1 ) and 2 mg L −1 (31 μmol L −1 ) , respectively. 1 Graphite furnace ato...

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Section: Study Of Operational Parametersmentioning

confidence: 84%

Section: Preliminary Studiesmentioning

confidence: 99%

Section: Preliminary Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Silva¹,

Costa²,

Takeuchi³

et al. 2011

J. Braz. Chem. Soc.

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show abstract

“…[10][11][12][13] Phenyl allyl ethers derived from aromatic phenols can be easily electrochemically polymerized on carbon electrodes to produce a modified electrode with good mechanical and chemical stability. 6,[14][15][16][17][18][19] The electropolymerization of the monomer to form this type of film can be performed by doing scans within a potential interval less positive than the oxidation potential of the functional group to preserve the key moiety.…”

Section: Introductionmentioning

confidence: 99%

Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Steter¹,

Pontólio²,

Campos³

et al. 2008

J. Braz. Chem. Soc.

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Este trabalho apresenta dois novos eletrodos de grafite modificados que foram preparados via polimerização da função fenólica, previamente funcionalizada por grupos azo (bipiridina e 2-metoxipiridina), que atuam como estruturas chaves para a ancoragem de ligantes de interesse. As sínteses dos monômeros BAP (4-([2,2']bipiridinil-4-ilazo)-fenol) e PAPmetóxi (5-(4-hidroxifenilazo)piridin-2-metóxi) foram simples, deram bons rendimentos e os monômeros foram facilmente eletropolimerizados, levando à formação de eletrodos modificados (EM) química e mecanicamente estáveis. Em solução aquosa e em circuito aberto, o EM PAP-metóxi formou complexos estáveis com Cd, Cu e Pb, produzindo picos redox bem definidos, demonstrando o grande potencial deste eletrodo para futuras aplicações analíticas. O monômero BAP foi utilizado para produzir um complexo de rutênio (BAP-Ru) que foi eletropolimerizado entre +0.50 e +0.75V (vs. Ag/AgCl), permitindo que o rutênio permanecesse disponível para atuar como catalisador. O EM BAP-Ru oxidou seletivamente uma variedade de substratos orgânicos dando produtos com rendimentos próximos ou melhores que aqueles obtidos por catálise homogênea com complexos de rutênio similares, ou quando este tipo de catalisador é impregnado em pasta de carbono.This work presents two new modified carbon electrodes which were prepared via the polymerization of a phenolic moiety previously functionalized with azo groups (bipyridine and 2-methoxypyridine) as key structures to anchor the desired ligands. The syntheses of BAP (4-([2,2']-bipyridinyl-4-ylazo)-phenol) and PAPmethoxy (5-(4-hidroxyphenylazo) pyridin-2-methoxy) were simple to perform, gave good yields and the monomers were easily electropolymerized resulting in chemically and mechanically stable modified electrodes. The PAPmethoxy ME formed stable complexes with Cd, Cu and Pb in aqueous media at open circuit and produced well defined redox peaks, showing good potential for future analytical applications. The BAP monomer was used to produce a ruthenium complex (BAP-Ru) which was electropolymerized from +0.50 to +0.75V (vs. Ag/AgCl) to leave the ruthenium available to act as a catalyst. The BAP-Ru ME was able to oxidize a variety of organic substrates with good selectivity. The yields obtained were either similar to, or better than, those obtained by homogeneous catalysis using a similar ruthenium catalyst or when this type of catalyst is supported in a carbon paste electrode. Keywords: metal complexation, polyphenolic film, ruthenium IntroductionThe modification of an electrode surface by an organic polymeric film functionalized either by a metal complex or a metal ligand has been broadly studied due to its applications on light absorption involving electron and energy transfer 1-5 and electrocatalysis, 6-9 as well as for its use as a sensor for trace analysis in a variety of media. [10][11][12][13] Phenyl allyl ethers derived from aromatic phenols can be easily electrochemically polymerized on carbon electrodes to produce a modified electrode with good mechani...

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Development of Solid Phase Microextraction‐High Performance Liquid Chromatographic Method for the Determination of Copper(II) in Environmental Samples Using Morpholine‐4‐Carbodithioate

Kaur

Malik

2007

Annali di Chimica

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A highly sensitive solid phase microextraction -high performance liquid chromatographic method has been developed for the determination of copper(II) using morpholine-4-carbodithioate (MDTC) as an analytical reagent. The MDTC formed yellowish-brown species of copper(II) at a pH range of 2-9 and complex was sorbed onto PDMS fiber. The Cu(II)-MDTC complex shows maximum absorbance at 430 nm and can be separated on C18 column by using acetonitrile : water (80 : 20) at a flow rate of 1.0 ml min -1 .The detection limit of method was found to be 0.51 µg L -1 . The interference due to common metal ions were studied. The repeatability of the method was checked by finding the relative standard deviation. The developed method was successfully employed for the determination of copper(II) in different alloy samples and the results were compared with existing methods.

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Copper determination in ethanol fuel by differential pulse anodic stripping voltammetry at a solid paraffin-based carbon paste electrode modified with 2-aminothiazole organofunctionalized silica

Cited by 103 publications

References 26 publications

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Fast and simultaneous determination of Pb2+ and Cu2+ in water samples using a solid paraffin-based carbon paste electrode chemically modified with 2-aminothiazole-silica-gel

Modified electrodes prepared with polyphenolic film containing ruthenium complex and metal ligand anchored by azo covalent bond

Development of Solid Phase Microextraction‐High Performance Liquid Chromatographic Method for the Determination of Copper(II) in Environmental Samples Using Morpholine‐4‐Carbodithioate

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