Development of a new sequential injection in-line cloud point extraction system for flame atomic absorption spectrometric determination of manganese in food samples

TALANTA

卷:77

Article

Lemos, Valfredo Azevedo¹  Baliza, Patricia Xavier²  de Carvalho, Anaildes Lago¹  Oliveira, Rafael Vasconcelos¹  Teixeira, Leonardo Sena Gomes³  Bezerra, Marcos Almeida¹ 

[1] Univ Estadual Sudoeste Bahia, Nucleo Quim Analit Bahia, LQA, BR-45506191 Jequie, Bahia, Brazil

[2] Univ Fed Bahia, Inst Quim, BR-40170280 Salvador, BA, Brazil

[3] Univ Salvador, Dept Engn & Arquitetura, BR-40220141 Salvador, BA, Brazil

关键词: Manganese;    Cloud point extraction;    Sequential injection;    Br-TAO;    Preconcentration;   

DOI  :  10.1016/j.talanta.2008.06.046

来源: Elsevier

【 摘 要 】

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 mu g 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. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

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