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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/6086

Title: Evaluation of sample preparation (grinding and sieving) of bivalves, coffee and cowpea beans for multi-element analysis
Other Titles: Microchemical Journal
Authors: Santos, Wagna Piler Carvalho dos
Hatje, Vanessa
Lima, Leonardo Nascimento
Trignano, Stefano Valente
Barros Junior, Francisco Carlos Rocha de
Castro, Jacira Teixeira
Korn, Maria das Graças Andrade
Keywords: Sample preparation;Grinding;Sieving;Food samples;Multi-element analysis
Issue Date: 2008
Abstract: Elemental analyses of food samples require several pre-treatment steps that constitute a great potential source of errors. In this study, the influence of cryogenic, ball and knife mill devices and also sieving using different sizes of sieve (100, 300 and 500 μm) was evaluated for samples of bivalves, coffee and cowpea beans. A two-factor ANOVAwas performed in each sample to test for differences between macro, micro and trace element concentrations determined by ICP OES. Results showed that the efficiency of the particle size reduction and sample homogeneity depends on the milling device and the nature of samples. Food samples may present segregation after comminution, and sieving might become a necessary step. Nevertheless, the sieve aperture has to be chosen cautiously, once it might influence the final element concentration. Overall, the expected results by employing cryogenic grinding, such as rapid sample homogenization and small particle size generated were also observed for ball mill. Contamination can be a critical issue for some elements and need to be evaluated individually.© 2008 Elsevier B.V. All rights reserved.
Description: Acesso restrito: Texto completo. p. 123-130
URI: http://www.repositorio.ufba.br/ri/handle/ri/6086
ISSN: 0026-265X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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