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Development and application of a screen-printed electrode modified with MWCNT for the electrocatalytic detection of thiram

dc.contributor.authorWong, Ademar
dc.contributor.authorDias, Ana Carolina Matos da Silva
dc.contributor.authorDutra, Rosa Amalia Fireman
dc.contributor.authorSotomayor, Maria Del Pilar Taboada [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-05-15T13:30:19Z
dc.date.available2015-05-15T13:30:19Z
dc.date.issued2013
dc.description.abstractInterest in the electronic properties of carbon nanotubes has increased in recent years. These materials can be used in the development of electrochemical sensors for the measurement and monitoring of analytes of environmental interest, such as pharmaceuticals, dyes, and pesticides. This work describes the use of homemade screen-printed electrodes modified with multi-walled carbon nanotubes (MWCNT) for the electrochemical detection of the fungicide thiram. The electrochemical characteristics of the proposed system were evaluated using cyclic voltammetry, with investigation of the electrochemical behavior of the sensor in the presence of the analyte, and estimation of electrochemical parameters including the diffusion coefficient, electron transfer coefficient (α), and number of electrons transferred in the catalytic electro-oxidation. The sensor response was optimized using amperometry. The best sensor performance was obtained in 0.1 mol L-1 phosphate buffer solution at pH 8.0, where a detection limit of 7.9 x 10-6 mol L-1 was achieved. Finally, in order to improve the sensitivity of the sensor, square wave voltammetry (SWV) was used for thiram quantification, instead of amperometry. Using SWV, a response range for thiram from 9.9 x 10-6 to 9.1 x 10-5 mol L-1 was obtained, with a sensitivity of 30948 µA mol L-1, and limits of detection and quantification of 1.6 x 10-6 and 5.4 x 10-6 mol L-1, respectively. The applicability of this efficient new alternative methodology for thiram detection was demonstrated using analyses of enriched soil samples.en
dc.description.affiliationUniversidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, Araraquara, Rua Professor Francisco Degni, 55, Jardim Quitandinha, CEP 14800060, SP, Brasil
dc.description.affiliationUnespUniversidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, Araraquara, Rua Professor Francisco Degni, 55, Jardim Quitandinha, CEP 14800060, SP, Brasil
dc.format.extent87-94
dc.identifierhttp://www.researchtrends.net/tia/abstract.asp?in=0&vn=17&tid=19&aid=3853&pub=2012&type=
dc.identifier.citationCurrent Topics In Electrochemistry, v. 17, p. 87-94, 2013.
dc.identifier.issn0972-4443
dc.identifier.lattes2933194342093387
dc.identifier.lattes3997574259552835
dc.identifier.lattes2933194342093387
dc.identifier.urihttp://hdl.handle.net/11449/123506
dc.language.isopor
dc.relation.ispartofCurrent Topics In Electrochemistry
dc.rights.accessRightsAcesso restritopt
dc.sourceCurrículo Lattes
dc.titleDevelopment and application of a screen-printed electrode modified with MWCNT for the electrocatalytic detection of thiramen
dc.typeArtigopt
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.author.lattes2933194342093387
unesp.author.lattes3997574259552835
unesp.author.lattes2933194342093387
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentQuímica Analítica - IQARpt

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