DETERMINATION of SILICON IN LUBRICANT OIL BY HIGH-RESOLUTION CONTINUUM SOURCE FLAME ATOMIC ABSORPTION SPECTROMETRY USING LEAST-SQUARE BACKGROUND CORRECTION and INTERNAL STANDARDIZATION

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dc.contributor.authorRaposo, Jorge Luiz [UNESP]
dc.contributor.authorOliveira, Silvana Ruella [UNESP]
dc.contributor.authorGomes Neto, José Anchieta [UNESP]
dc.contributor.authorNobrega, Joaquim Araujo
dc.contributor.authorJones, Bradley Todd
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionWake Forest Univ
dc.date.accessioned2014-05-20T14:19:09Z
dc.date.available2014-05-20T14:19:09Z
dc.date.issued2011-01-01
dc.description.abstractThe least-squares background correction (LSBC) and internal standardization procedures were combined to eliminate spectral interferences caused by the CS molecular band (251.602 nm) and transport effects for determining Si in sulfuric acid digests of lubricant oil by high-resolution continuum source flame atomic absorption spectrometry. Aluminum, Ba, Ti, V, and W were tested as internal standard (IS) candidates, and W provided the best results. For absorbance measurements of solutions containing 0.5-5.0 mg L-1 Si in the presence of 25 mg L-1 W (at the wavelength integrated absorbance equivalent to 3 pixels), the correlation coefficient for the ratio of absorbance of Si to absorbance of W vs. analyte concentration was 0.9978. Fluctuations in analytical signals due to variations in sulfuric acid concentrations or acetylene/nitrous oxide flow-rate ratios were corrected by using this calibration plot. Relative standard deviations varied from 1.9 to 7.2% and 2.1 to 5.4% (n=12) with and without LSBC/IS, respectively. Recoveries for samples spiked with 2.0 mg L-1 Si in 5.0% (v/v) sulfuric acid were within the 72.5-82.5% and 94.0-99.0% ranges without correction and by LSBC associated with internal standardization procedure, respectively. Accuracy of the proposed method was checked for the determination of Si in commercial lubricant oils and results obtained with internal standardization were better than those without correction.en
dc.description.affiliationUNESP Univ Estadual Paulista, Dept Analyt Chem, Araraquara, SP, Brazil
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Chem, BR-13560 São Carlos, SP, Brazil
dc.description.affiliationWake Forest Univ, Dept Chem, Winston Salem, NC 27109 USA
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Dept Analyt Chem, Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent2150-2161
dc.identifierhttp://dx.doi.org/10.1080/00032719.2010.546025
dc.identifier.citationAnalytical Letters. Philadelphia: Taylor & Francis Inc, v. 44, n. 12, p. 2150-2161, 2011.
dc.identifier.doi10.1080/00032719.2010.546025
dc.identifier.issn0003-2719
dc.identifier.lattes8708735699846578
dc.identifier.urihttp://hdl.handle.net/11449/25774
dc.identifier.wosWOS:000294602900008
dc.language.isoeng
dc.publisherTaylor & Francis Inc
dc.relation.ispartofAnalytical Letters
dc.relation.ispartofjcr1.206
dc.relation.ispartofsjr0,344
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectHigh-resolution continuum source atomic absorption spectrometryen
dc.subjectInternal standardizationen
dc.subjectLubricant oilen
dc.subjectSiliconen
dc.titleDETERMINATION of SILICON IN LUBRICANT OIL BY HIGH-RESOLUTION CONTINUUM SOURCE FLAME ATOMIC ABSORPTION SPECTROMETRY USING LEAST-SQUARE BACKGROUND CORRECTION and INTERNAL STANDARDIZATIONen
dc.typeArtigo
dcterms.licensehttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dcterms.rightsHolderTaylor & Francis Inc
unesp.author.lattes8708735699846578
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Analítica - IQ