Use of organofunctionalized nanoporous silica gel to improve the lifetime of carbon paste electrode for determination of copper(II) ions

Javanbakht, Mehran; Badiei, Alireza; Ganjali, Mohammad Reza; Norouzi, Parviz; Hasheminasab, Abed; Abdouss, Majid

doi:10.1016/j.aca.2007.08.038

Cited by 105 publications

(38 citation statements)

References 48 publications

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“…These attractive characteristics have encouraged applications of electrochemical techniques in several areas such as biomedical analysis, industrial quality control and environmental monitoring. 2 Potentiometry [3][4][5] and potentiometric stripping methods, 6 the simplest electroanalytical techniques, have been successfully used for quantification of some metallic species in different samples. However, stripping voltammetry is by far the most used electrochemical technique for heavy metals quantification.…”

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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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: 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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“…Then attraction of other scientists to this materials caused discovery of other types of nanoporous materials such as SBA-15 (Zhao et al, 1998), LUS-1 (Bonneviot et al, 2003), FSM-16 (Inagaki et al, 1993), KIT-1 (Ryoo et al, 1996), MSU (Bagshaw et al, 1995), and HSM (Tanev & Pinnavaia, 1995)which were synthesized within highly acidic to strongly basic pH range using cationic, anionic, neutral and nonionic structure directing agents. Among these materials, MCM-41, LUS-1 and SBA-15 are most studied ones in our previous researches such as studies on metal modification Béland et al, 1998), pre-concentration of metals (Ganjali et al, 2006;Javanbakht et al, 2009b;Javanbakht et al, 2010), modification with 8-hydroxyquinoline (Badiei et al, 2011b;Badiei et al, 2011a), carbon paste electrodes (Ganjali et al, 2010;Javanbakht et al, 2007a;Javanbakht et al, 2007b;Javanbakht et al, 2009a), solid phase micro extraction (Hashemi et al, 2009) and hydroxylation catalysts (Arab et al). Therefore, these materials are the major subject in the coming discussions about catalytic synthesis of CNTs.…”

Section: Nanoporous Silicasmentioning

confidence: 99%

Synthesis of Carbon Nanotubes Using Metal-Modified Nanoporous Silicas

Zarabadi–Poor¹,

Badiei²

2011

Carbon Nanotubes - Growth and Applications

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“…The silica film was used to fabricate copper-selective carbon paste electrodes. 21 The dipyridyl group modification on the porous silica film served as the ionophore for copper(II) binding, enabling selective binding. Furthermore, the immobilization of the functional dipyridyl group on the silica backbone resulted in a significant improvement in sensor lifetime (~9 months).…”

Section: Materials Ionophores and Ion Exchangersmentioning

confidence: 99%

Electrochemical Sensors

2013

Encyclopedia of Biophysics

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This review covers publications related to electrochemical sensors that appeared in print during the years 2006 and 2007. The focus of the review is on the development of electrochemical sensing principles including potentiometric and chronopotentiometric sensors, reference electrodes, voltammetric sensors, and electrochemical biosensors.References were collected by searching electrochemical sensor-related work using ACS SciFinder and ISI Science Citation Index. In addition, the tables of contents of several analytical journals were reviewed manually to identify relevant articles. Only original and review articles written in English were considered. Patents, book chapters or book series, and conference proceedings or abstracts were not considered for this review. The number of references was limited to 200 and as a result only a fraction of relevant work is covered. Specifically, the review was written to focus on fundamental aspects of electrochemical sensor research emphasizing new chemical concepts and not simply the application of electrochemical sensors. On the basis of these guidelines, several hybrid systems whereby electrochemical detection schemes were combined with a separation technique such as microdialysis, electrophoresis, chromatography, and lab-on-a-chip were not included in this review.We ask that our readers note that our review is not a comprehensive coverage of the above topics, but rather a snapshot of research conducted over the past two years. Obviously, electrochemical sensor research is still expanding and of interest to a number of disciplines beyond traditional chemistry. As such, it was not possible to cover all manuscripts published. We apologize to the authors of manuscripts that were not included in this review. POTENTIOMETRIC SENSORS ReviewsBakker and Pretsch published a broad review on modern potentiometry describing techniques for improving sensor performance, miniaturizing sensor platforms, and expanding the application of potentiometric sensors for environmental trace analysis and biosensing (98 citations). 1 Likewise, Pretsch provided a general overview on ion-selective electrodes (ISEs) focusing on improving detection limits and understanding non-classical (i.e., non-equilibrium) potentiometry for monitoring clinical relevant polyions such as heparin and protamine (81 citations). 2 De Marco et al. reviewed ISE methodologies for the analysis of trace metals and anions (e.g., F − , CN − , NO 3 − , NO 2 − , and Cl − ) in environmental samples. 3

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Use of organofunctionalized nanoporous silica gel to improve the lifetime of carbon paste electrode for determination of copper(II) ions

Cited by 105 publications

References 48 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

Synthesis of Carbon Nanotubes Using Metal-Modified Nanoporous Silicas

Electrochemical Sensors

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