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Simultaneous determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by GFAAS

dc.contributor.authorde Oliveira, A. P.
dc.contributor.authorde Moraes, M.
dc.contributor.authorNeto, JAG
dc.contributor.authorLima, E. C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Sul (UFRGS)
dc.date.accessioned2014-05-20T15:21:28Z
dc.date.available2014-05-20T15:21:28Z
dc.date.issued2002-03-01
dc.description.abstractA method has been developed for the simultaneous determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by graphite furnace atomic absorption spectrometry (GFAAS) using a transversely heated graphite atomizer (THGA) with longitudinal Zeeman-effect background correction. The thermal behavior of analytes during the pyrolysis and atomization stages using the mixture Pd(NO3)(2) + Mg(NO3)(2) as the chemical modifier was investigated in 0.028 mol L-1 HNO3, 0.14 mol L-1 HNO3, and diluted ethanol (1 + 1, v/v) containing different nitric acid concentrations. With 5 rhog Pd + 3 mug Mg as the modifiers, pyrolysis and atomization temperatures of the heating program of the atomizer were fixed at 1200 C and 2200degreesC respectively. For 20 muL of diluted sample (10 muL ethanol + 10 muL of 0.28 mol L-1 HNO3) dispensed into the graphite tube, analytical curves in the 2.0 - 50 mug L-1 Al, As, Cu, Fe, Mn, Ni ranges were established. The calculated characteristic masses were - 37 pg Al, 73 pg As, 31 pg Cu, 16 pg Fe, 9 pg Mn, and 44 pg Ni, and the lifetime of the tube was around 2 50 firings. The limits of detection (LOD) based on integrated absorbance were 1.2 mug L-1 Al, 2.5 mug L-1 As. 0.22 mug L-1 Cu, 1.6 L-1 Fe 0.20 mug L-1 Mn 1.1 mug L-1 Ni. The relatively standard deviations (n = 12) were less than or equal to 3%, less than or equal to 6%, less than or equal to 2%, less than or equal to 3.4%, less than or equal to 1.3%, and less than or equal to 2% for Al, As, Cu, Fe, Mn, and Ni, respectively, the recoveries of Al, As, Cu, Fe, Mn and Ni added to fuel ethanol samples varied from 77% to 112%, 92% to 114%, 104% to 113%, 73% to 116%, 91% to 122% and 93% to 116%, respectively. Accuracy was checked for Al, As, Cu, Fe, Mn, and Ni determination in 20 samples purchased at local gas stations in Araraquara city, Brazil. A paired t-test showed that the results were in agreement at the 95% confidence level with those obtained by single-element GFAAS.en
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Rio Grande Sul, Dept Quim Analit, BR-91501970 Porto Alegre, RS, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.format.extent39-43
dc.identifier.citationAtomic Spectroscopy. Norwalk: Perkin-elmer Corp, v. 23, n. 2, p. 39-43, 2002.
dc.identifier.issn0195-5373
dc.identifier.urihttp://hdl.handle.net/11449/32605
dc.identifier.wosWOS:000175739900001
dc.language.isoeng
dc.publisherPerkin-elmer Corp
dc.relation.ispartofAtomic Spectroscopy
dc.relation.ispartofjcr1.123
dc.relation.ispartofsjr0,327
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.titleSimultaneous determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by GFAASen
dc.typeArtigopt
dcterms.rightsHolderPerkin-elmer Corp
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt

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