Evaluation of Ir and Pd(NO3)(2)/Mg(NO3)(2) as Modifiers for the Simultaneous Determination of Mn, Ni, Pb, and Sb in Fuel Ethanol by Graphite Furnace MS

Autor(es)

Neves, Denise Regina ^[1] ; Oliveira, Silvana Ruella ^[1] ; do Rego, Jardes Figueredo ^[1] ; Flumignan, Danilo Luiz ^[1] ; Oliveira, Jose Eduardo ^[1] ; Gomes Neto, Jose Anchieta ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Chem, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ATOMIC SPECTROSCOPY; v. 31, n. 4, p. 141-146, JUL-AUG 2010.
• Citações Web of Science: 2

Resumo

The mixture Pd(NO(3))(2)/Mg(NO(3))(2) and an Ir-coated platform co-injected with Pd(NO(3))(2)/Mg(NO(3))(2) were evaluated as modifiers for the direct and simultaneous determination of Mn, Ni, Pb, and Sb in fuel ethanol by graphite furnace atomic absorption spectrometry. For a 20-mu L diluted sample dispensed onto the platform of graphite tube in the presence of 5 mu g Pd and 3 mu g Mg, analytical curves in the 0 - 50.0 mu g L(-1) range were built up resulting in linear correlation coefficients better than 0.99. The calculated characteristic masses were 6 pg Mn, 25 pg Ni, 67 pg Pb, and 50 pg Sb. The limits of detection CLOD) were 013 mu g L(-1) Mn, 1.2 mu g L(-1) Ni, 1.2 mu g L(-1) Pb, and 0.10 mu g L(-1) Sb. Accuracy was checked after the analysis of 10 commercial fuel ethanol samples. The results were in agreement at a 95% confidence level (paired Rest) with those obtained by inductively coupled plasma mass spectrometry. The recovery of Mn, Ni, Pb, and Sb in fuel ethanol samples was within the 97-104%, 86-116%, 83-119%, and 92-104% intervals, respectively, and the relative standard deviation (n = 12) was typically 4%, 7%, 6%, and 5%, respectively. The useful lifetime of the THGA atomizer was around 300 firings. (AU)

• Processo FAPESP: 06/59083-9 - Espectrometria de massa acoplada ao plasma induzido: aspectos fundamentais e aplicações
• Beneficiário: Joaquim de Araújo Nóbrega
• Modalidade de apoio: Auxílio à Pesquisa - Temático