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| Registros recuperados : 17 | |
| 14. |  | SILVA, W. T. L.; SIMÕES, F. R.; SIMÕES, M. L.; VAZ, C. M. P.; MARTIN-NETO, L. Estudo da interação entre substâncias húmicas e o inseticida Paration metílico por método eletroquímico. In: ENCONTRO BRASILEIRO DE SUBSTÂNCIAS HÚMICAS, 5., 2003, Curitiba, PR. Grupo Brasileiro da IHSS. Anais... Curitiba: Grupo Brasileiro da IHSS, 2003. p. 151-153.| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | SIMÕES, F. R.; SILVA, W. T. L. da; SIMÕES, M. L.; MARTIN-NETO, L.; VAZ, C. M. P. Effect of humic substances on the electrochemical reduction of p-nitrophenol. International journal of environmental analytical chemistry, New York, v. 86, n. 10, p. 779-787, 2006.| Biblioteca(s): Embrapa Instrumentação. |
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| 17. | | VAZ, C. M. P.; SILVA JUNIOR, P. R. V.; PRADO, I.; CASTANHO, G. M.; SIMOES, F. R.; MACHADO, S. A. S. Electrochemical behavior of parent and photodegradation products of some selected pesticides. Química Nova, São Paulo, v. 31, n. 6, p. 1310-1314, 2008.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 17 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Instrumentação. |
|
Data corrente: |
09/03/2005 |
|
Data da última atualização: |
25/11/2009 |
|
Autoria: |
SIMÕES, F. R.; MATTOSO, L. H. C.; VAZ, C. M. P. |
|
Título: |
Modified carbon paste-polyaniline electrodes for the electrochemical determination of the herbicide 2,4-D. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Sensor letters, [S. l.], v. 2, n. 3-4, p. 221-225, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
Redox processes of pesticides have been used to establish electroanalytical procedures to determine these compounds in natural samples. For the herbicide 2,4 dichlorophenoxyacetic acid (2,4-D) it has been shown that no redox process take place in the most common electrode material (carbon, platinum, mercury) and electroanalytical conditions used. Modified carbon paste electrodes has been shown to be an alternative for the electrochemical determination of the herbicide 2,4-D. We investigate in this paper three modified carbon paste-polyaniline electrodes, using in-situ electropolymerization of aniline on the carbon paste surface (CPE1), mixing polyaniline powder with the carbon paste material (CPE2) and in-situ chemical polymerization of aniline on graphite powder (CPE3). The affinity of the 2,4-D with the polyaniline was investigated with UV-visible spectrophotometry and the electrochemical response of the three modified carbon paste-polyaniline electrodes by cyclic voltammetry. the UV-vis. results showed that about 60% of the herbicide sorbed on the polyaniline particles after 24 hours of contact. Typical cyclic voltammograms of the polyaniline were affected by the presence of the herbicide on polyaniline, increasing both anodic and cathodic currents at approximately 200 mV and 0 mV for the CPE2 and CPE3 electrodes. The best response was obtained with the CPE3 electrode. |
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Palavras-Chave: |
Determinação Eletroquimica. |
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Thesagro: |
Carbono; Herbicida. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01940naa a2200181 a 4500
001 1028846
005 2009-11-25
008 2004 bl --- 0-- u #d
100 1 $aSIMÕES, F. R.
245 $aModified carbon paste-polyaniline electrodes for the electrochemical determination of the herbicide 2,4-D.
260 $c2004
520 $aRedox processes of pesticides have been used to establish electroanalytical procedures to determine these compounds in natural samples. For the herbicide 2,4 dichlorophenoxyacetic acid (2,4-D) it has been shown that no redox process take place in the most common electrode material (carbon, platinum, mercury) and electroanalytical conditions used. Modified carbon paste electrodes has been shown to be an alternative for the electrochemical determination of the herbicide 2,4-D. We investigate in this paper three modified carbon paste-polyaniline electrodes, using in-situ electropolymerization of aniline on the carbon paste surface (CPE1), mixing polyaniline powder with the carbon paste material (CPE2) and in-situ chemical polymerization of aniline on graphite powder (CPE3). The affinity of the 2,4-D with the polyaniline was investigated with UV-visible spectrophotometry and the electrochemical response of the three modified carbon paste-polyaniline electrodes by cyclic voltammetry. the UV-vis. results showed that about 60% of the herbicide sorbed on the polyaniline particles after 24 hours of contact. Typical cyclic voltammograms of the polyaniline were affected by the presence of the herbicide on polyaniline, increasing both anodic and cathodic currents at approximately 200 mV and 0 mV for the CPE2 and CPE3 electrodes. The best response was obtained with the CPE3 electrode.
650 $aCarbono
650 $aHerbicida
653 $aDeterminação Eletroquimica
700 1 $aMATTOSO, L. H. C.
700 1 $aVAZ, C. M. P.
773 $tSensor letters, [S. l.]$gv. 2, n. 3-4, p. 221-225, 2004.
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