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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/6021

Title: Development of a new sequential injection in-line cloud point extraction system for flame atomic absorption spectrometric determination of manganese in food samples
Other Titles: Talanta
Authors: Lemos, Valfredo Azevedo
Baliza, Patrícia Xavier
Carvalho, Anaildes Lago de
Oliveira, Rafael Vasconcelos
Teixeira, Leonardo Sena Gomes
Bezerra, Marcos de Almeida
Keywords: Manganese;Cloud point extraction;Sequential injection;Br-TAO;Preconcentration
Issue Date: 2008
Abstract: A preconcentration method for manganese determination by sequential injection cloud point extraction with subsequent detection by flame atomic absorption spectrometry (FAAS) has been developed. The enrichment of Mn was performed after a preliminary on-line cloud point extraction and entrapment of manganese-containing surfactant aggregated within a minicolumn packed with cotton. The laboratory-made reagent 4-(5′-bromo-2′-thiazolylazo)orcinol (Br-TAO) and the surfactant Triton X-114 were used for cloud point extraction. The manganese ions were eluted with sulphuric acid solution and directly introduced into the FAAS. Chemical and flow variables affecting the preconcentration were studied. Using a sample volume of 2.80 mL the limit of detection and enrichment factor were calculated to be 0.5 μg L−1 and 14, respectively. The sample frequency is 48 h−1, considering a total run cycle of 75 s. The accuracy of the proposed method has been demonstrated by the analysis of the certified reference biological materials rice flour and tomato leaves. The method has been applied to determination of manganese in food samples.
Description: Acesso restrito: Texto completo. p. 388-393
URI: http://www.repositorio.ufba.br/ri/handle/ri/6021
ISSN: 0039-9140
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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