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dc.contributor.authorDe Oliveira, Adriana Paiva [UNESP]
dc.contributor.authorDe Moraes, Mercedes [UNESP]
dc.contributor.authorGomes Neto, José Anchieta [UNESP]
dc.contributor.authorLima, Eder Cláudio [UNESP]
dc.identifier.citationAtomic Spectroscopy, v. 23, n. 2, p. 39-43, 2002.
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 Zeemaneffect 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-1HNO3, 0.14 mol L-1 HNO3, and dilutedethanol (1 + 1, v/v) containing different nitric acid concentrations. With 5 μg Pd + 3 μg Mg as the modifiers, pyrolysis and atomization temperatures of the heating program of the atomizer were fixed at 1200°C and 2200°C, respectively. For 20 μL of diluted sample (10 μL ethanol + 10 μL of 0.28 mol L-1 HNO3) dispensed into the graphite tube, analytical curves in the 2.0 - 50 μg 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 250 firings. The limits of detection (LOD) based on integrated absorbance were 1.2 μg L-1 Al, 2.5 μg L-1 As, 0.22 μg L-1 Cu, 1.6 μg L-1 Fe, 0.20 μg L-1 Mn, 1.1 μg L-1 Ni. The relative standard deviations (n = 12) were ≤ 3%, ≤ 6%, ≤ 2%, ≤ 3.4%, ≤ 1.3%, and ≤ 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.relation.ispartofAtomic Spectroscopy
dc.titleSimultaneous determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by GFAASen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationInstituto de Química Universidade Estadual Paulista, P.O. Box 355, 14801-970 Araraquara-SP
dc.description.affiliationUnespInstituto de Química Universidade Estadual Paulista, P.O. Box 355, 14801-970 Araraquara-SP
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