Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3019
Registo completo
Campo DCValorIdioma
dc.contributor.authorBarroso, M. Fátima-
dc.contributor.authorVaz, M. Carmo V. F.-
dc.contributor.authorSales, M. Goreti F.-
dc.contributor.authorPaíga, Paula-
dc.contributor.authorDelerue-Matos, Cristina-
dc.date.accessioned2013-11-29T11:14:41Z-
dc.date.available2013-11-29T11:14:41Z-
dc.date.issued2006-
dc.identifierDOI: 10.1080/00032710600755827-
dc.identifier.urihttp://hdl.handle.net/10400.22/3019-
dc.description.abstractA detailed study of voltammetric behavior of ethiofencarb (ETF) is reported using glassy carbon electrode (GCE) and hanging mercury drop electrode (HMDE). With GCE, it is possible to verify that the oxidative mechanism is irreversible, independent of pH, and the maximum intensity current was observed at +1.20 V vs. AgCl/Ag at pH 1.9. A linear calibration line was obtained from 1.0x10-4 to 8.0x10-4 mol L-1 with SWV method. To complete the electrochemical knowledge of ETF pesticide, the reduction was also explored with HMDE. A well-defined peak was observed at –1.00V vs. AgCl/Ag in a large range of pH with higher signal at pH 7.0. Linearity was obtained in 4.2x10-6 and 9.4x10-6 mol L-1 ETF concentration range. An immediate alkaline hydrolysis of ETF was executed, producing a phenolic compound (2-ethylthiomethylphenol) (EMP), and the electrochemical activity of the product was examined. It was deduced that it is oxidized on GCE at +0.75V vs. AgCl/Ag with a maximum peak intensity current at pH 3.2, but the compound had no reduction activity on HMDE. Using the decrease of potential peak, a flow injection analysis (FIA) system was developed connected to an amperometric detector, enabling the determination of EMP over concentration range of 1.0x10-7 and 1.0x10-5 mol L-1 at a sampling rate of 60 h-1. The results provided by FIA methodology were performed by comparison with results from high-performance liquid chromatography (HPLC) technique and demonstrated good agreement with relative deviations lower than 4%. Recovery trials were performed and the obtained values were between 98 and 104%.por
dc.language.isoengpor
dc.publisherTaylor & Francispor
dc.relation.ispartofseriesAnalytical Letters; Vol. 39, Issue 12-
dc.rightsopenAccesspor
dc.subjectEthiofencarbpor
dc.subjectOxidationpor
dc.subjectReductionpor
dc.subjectSquare wave voltammetrypor
dc.subjectFlow injection analysispor
dc.subjectAmperometric detectionpor
dc.titleElectroanalytical study of the pesticide ethiofencarbpor
dc.typearticlepor
dc.peerreviewedyespor
degois.publication.firstPage2387por
degois.publication.lastPage2403por
degois.publication.titleAnalytical Letterspor
degois.publication.volume39por
dc.relation.publisherversionhttp://www.tandfonline.com/doi/abs/10.1080/00032710600755827#.UotGrUr6Q24por
Aparece nas colecções:ISEP – GRAQ – Artigos

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
ART_MBarroso_2006_GRAQ.pdf184,85 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.