Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/5960
metadata.dc.type: Artigo de Periódico
Issue Date: Jun-2000
metadata.dc.creator: ALEIXO, Poliana Carolina
NÓBREGA, Joaquim de Araújo
SANTOS JÚNIOR, Dário
MÜLLER, Regina Celi Sarkis
Title: Determinação direta de selênio em água de coco e em leite de coco utilizando espectrometria de absorção atômica com atomização eletrotérmica em forno de grafite
Other Titles: Direct determination of selenium in coconut water and coconut milk using graphite furnace atomic absorption spectrometry
Citation: ALEIXO, Poliana C. et al. Determinação direta de selênio em água de coco e em leite de coco utilizando espectrometria de absorção atômica com atomização eletrotérmica em forno de grafite. Química Nova, São Paulo, v. 23, n. 3, p. 310-312, maio/jun. 2000. Disponível em: <http://www.scielo.br/pdf/qn/v23n3/2814.pdf>. Acesso em: 23 jul. 2014. <http://dx.doi.org/10.1590/S0100-40422000000300005>.
Abstract: Selenium is both essential and toxic to man and animals, depending on the concentration and the ingested form. Most fruits and vegetables are poor sources of selenium, but coconut can be a good selenium source. Samples were suspended (1 + 4 v/v) in a mixture of tertiary amines soluble in water (10% v/v CFA-C). This simple sample treatment avoided contamination and decreased the analysis time. The standard additions method was adopted for quantification. The action of the autosampler was improved by the presence of the amines mixture in the suspension. A Varian model AA-800 atomic absorption spectrometer equipped with a graphite furnace and a GTA 100 autosampler was used for selenium determination in coconut water and coconut milk. Background correction was performed by means of the Zeeman effect. Pyrolytically coated graphite tubes were employed. Using Pd as chemical modifier, the pyrolysis and the atomization temperatures were set at 1400 and 2200oC, respectively. For six samples, the selenium concentration in coconut water varied from 6.5 to 21.0 mg L-1 and in coconut milk from 24.2 to 25.1 mg L-1. The accuracy of the proposed method was evaluated by an addition-recovery experiment and all recovered values are in the 99.5-102.3% range. The main advantage of the proposed method is that it can be directly applied without sample decomposition.
Keywords: Selênio
Água de coco
Leite de coco
Composição mineral
Espectrometria de absorção atômica em forno de grafite
ISSN: 0100-4042
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - FAQUI/ICEN

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