Tungsten permanent chemical modifier for fast estimation of Se contents in soil by graphite furnace atomic absorption spectrometry

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dc.contributor.authorRosa, C. R.
dc.contributor.authorFreschi, GPG
dc.contributor.authorDe Moraes, M.
dc.contributor.authorNeto, JAG
dc.contributor.authorNobrega, J. A.
dc.contributor.authorNogueira, ARA
dc.contributor.authorSacramento, L. V.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.date.accessioned2014-05-20T13:24:35Z
dc.date.available2014-05-20T13:24:35Z
dc.date.issued2003-07-02
dc.description.abstractA tungsten carbide coating on the integrated platform of a transversely heated graphite atomizer was used as a modifier for the direct determination of Se in soil extracts by graphite furnace atomic absorption spectrometry. Diethylenetriaminepentaacetic acid (0.0050 mol L-1) plus ammonium hydrogencarbonate (1.0 mol L-1) extracted predominantly available inorganic selenate from soil. The formation of a large amount of carbonaceous residue inside the atomizer was avoided with a first pyrolysis step at 600 degreesC assisted by air during 30 s. For 20 muL of soil extracts delivered to the atomizer and calibration by matrix matching, an analytical curve (10.0-100 mug of L-1) with good linear correlation (r = 0.999) between integrated absorbance and analyte concentration was established. The characteristic mass was similar to63 pg of Se, and the lifetime of the tube was similar to750 firings. The limit of detection was 1.6 mug L-1, and the relative standard deviations (n = 12) were typically <4% for a soil extract containing 50 mug of L-1. The accuracy of the determination of Se was checked for soil samples by means of addition/recovery tests. Recovery data of Se added to four enriched soil samples varied from 80 to 90% and indicated an accurate method.en
dc.description.affiliationUniv Estadual Paulista, Inst Quim, Dept Quim Analit, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationEmbrapa Pecuaria Sudeste, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciências Farmaceut, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, Dept Quim Analit, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciências Farmaceut, BR-14801970 Araraquara, SP, Brazil
dc.format.extent3920-3923
dc.identifierhttp://dx.doi.org/10.1021/jf0212439
dc.identifier.citationJournal of Agricultural and Food Chemistry. Washington: Amer Chemical Soc, v. 51, n. 14, p. 3920-3923, 2003.
dc.identifier.doi10.1021/jf0212439
dc.identifier.issn0021-8561
dc.identifier.urihttp://hdl.handle.net/11449/7672
dc.identifier.wosWOS:000183824200003
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofJournal of Agricultural and Food Chemistry
dc.relation.ispartofjcr3.412
dc.relation.ispartofsjr1,269
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectseleniumpt
dc.subjectsoilpt
dc.subjectdiethylenetriaminepentaacetic acidpt
dc.subjecttungsten permanent modifierpt
dc.subjectGFAASpt
dc.titleTungsten permanent chemical modifier for fast estimation of Se contents in soil by graphite furnace atomic absorption spectrometryen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/paragonplus/copyright/jpa_form_a.pdf
dcterms.rightsHolderAmer Chemical Soc
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Analítica - IQ