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Electroanalytical study of the pesticide ethiofencarb

2006Journal article Open access
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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.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.identifier.doi10.1080/00032710600755827pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.22/3019
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherTaylor & Francispor
dc.relation.ispartofseriesAnalytical Letters; Vol. 39, Issue 12
dc.relation.publisherversionhttp://www.tandfonline.com/doi/abs/10.1080/00032710600755827#.UotGrUr6Q24por
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.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2403por
oaire.citation.startPage2387por
oaire.citation.titleAnalytical Letterspor
oaire.citation.volume39por
person.familyNamede Sá Barroso
person.familyNamePaíga
person.familyNameDelerue-Matos
person.givenNameMaria de Fátima
person.givenNamePaula
person.givenNameCristina
person.identifier1668889
person.identifier.ciencia-idAF16-22E5-5EBD
person.identifier.ciencia-id331A-5D6A-D3C8
person.identifier.ciencia-id9A1A-43FB-5C27
person.identifier.orcid0000-0001-9011-5992
person.identifier.orcid0000-0002-9593-1355
person.identifier.orcid0000-0002-3924-776X
person.identifier.ridQ-4930-2018
person.identifier.ridD-4990-2013
person.identifier.scopus-author-id25631648000
person.identifier.scopus-author-id6506638953
person.identifier.scopus-author-id6603741848
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication3d701c85-4580-4614-be6d-5a1abc8cf729
relation.isAuthorOfPublication4a0677dc-0b54-4831-aa9a-4a73f0df911d
relation.isAuthorOfPublication09f6a7bd-2f15-42b0-adc5-04bd22210519
relation.isAuthorOfPublication.latestForDiscovery09f6a7bd-2f15-42b0-adc5-04bd22210519

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