Voltammetric analysis of Pb(II) in natural waters using a carbon paste electrode modified with 5-mercapto-1-methyltetrazol grafted on hexagonal mesoporous silica

Morante‐Zarcero, Sonia; Sánchez, Alfredo; Fajardo, Mariano; Hierro, Isabel del; Sierra, Isabel

doi:10.1007/s00604-009-0287-3

Cited by 35 publications

(14 citation statements)

References 23 publications

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“…2+ and Cu 2+ are close to those reported in literature using other electroanalytical methods. 12,22,23,26,27,30 The main positive aspects of the proposed method are the very short accumulation time and the use of a silica commercially available at relatively low cost. In addition, solid paraffin is an inexpensive binder agent able to produce robust electrodes in a very simple and fast way.…”

Section: Analytical Studiesmentioning

confidence: 99%

“…Nanostructured [22][23][24] and mesoporous [25][26][27][28][29][30] silica have been widely used to prepare chemically modified electrodes for quantification of several metallic ions. 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.…”

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: Analytical Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…16.15). 734 Other examples are mesoporous silica functionalized with aminopropyl, 712,735 carbamoylphosphonic acid, 724,736 2-benzothiazolethiol, 737 5-mercapto-1-methyltetrazole, 738 propylsulfonic acid, 721 thiomorpholine, 739 carnosine, 720 acetylacetone, 740 2-acetylpyridine, 741 thiourea derivatives, 742 or cyclam. 618,619 More recently, ordered mesoporous carbon electrodes have been developed with great promise in electroanalysis, 44 these materials being most often deposited as particulate films onto solid electrodes but an example of OMC-modified CPEs has been also described.…”

Section: Nanomaterialsmentioning

confidence: 99%

Electrode Materials (Bulk Materials and Modification)

Walcarius

Etienne

Herzog

et al. 2014

Environmental Analysis by Electrochemical Sensors and Biosensors

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“…However, the toxicity, instability and difficulties in handling, storage, and disposal of mercury electrode may severely restrict its application [9]. Therefore, many electrodes such as bismuth film electrodes [10], gold-coated electrodes [11], silver electrodes [12], glassy carbon electrodes [13,14], screen-printed carbon electrodes [15], and carbon paste electrodes [16] have been favorably replaced for the mercury electrode for sensitive heavy metal determinations.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical sensor for lead(II) ion using a carbon ionic-liquid electrode modified with a composite consisting of mesoporous carbon, an ionic liquid, and chitosan

Zhai

Gao

et al. 2012

Microchim Acta

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A novel electrode was prepared that enables sensing of lead(II) ion. A suspension composed of ordered mesoporous carbon (OMC), an ionic liquid (IL), and chitosan was deposited on the highly conductive surface of a carbon ionic-liquid electrode (CILE). The surface of the sensing electrode was characterized by scanning electron microscopy and cyclic voltammetry. The new electrode can be used to determine lead(II) ion because the hydrophobic ionic liquid of the CILE can extract Pb(II), while the OMC accelerates the electron transfer rate between the electrode and Pb(II) and also strongly adsorbs Pb(II). The resulting electrode displays excellent and synergistic response to Pb(II) which is linear in the range from 0.05 to 1.4 μM, with a correlation coefficient of 0.997 and a detection limit of 25 nM.

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Voltammetric analysis of Pb(II) in natural waters using a carbon paste electrode modified with 5-mercapto-1-methyltetrazol grafted on hexagonal mesoporous silica

Cited by 35 publications

References 23 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

Electrode Materials (Bulk Materials and Modification)

Electrochemical sensor for lead(II) ion using a carbon ionic-liquid electrode modified with a composite consisting of mesoporous carbon, an ionic liquid, and chitosan

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