Multivariate optimization applied to chromium determination in milk and similar baby food samples by graphite furnace atomic absorption spectrometry
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Membros da banca
Resumo
Chromium (Cr) is an essential element, but high levels in foods can be toxic particularly for children. A fast and efficient method to determine Cr in milk and other infant foods using slurries and liquid samples is presented. Slurries were prepared in ultrapure water with 10 minutes of sonica- tion. The liquid samples were diluted in ultrapure water when necessary. Multivariate optimization was used to establish some optimal analytical parameters through a fractional factorial design and a central composite design. Slurried and diluted samples were analyzed directly by GFAAS. The method presented a limit of detection of 1.43 μg L-1, characteristic mass of 4.5 pg (recommended value of 3.0 pg), RSD from 1.5 to 11.8% (n=8), and a linear range from 4.78 to 50.0 μg L-1 using rhodium (500 μg) as the permanent modifier. The accuracy was evaluated by analyzing standard reference material SRM 8435 Whole Milk Powder. Good agreement was found with the obtained and certified values. The Cr concentrations of the powdered samples were between 0.042 and 1.900 μg g-1.
Abstract
Assunto
Cromo, Leite, Espectroscopia de absorção atômica, Leite - Contaminação
Palavras-chave
Chromium, Milk, Multivariate optimization, Graphite furnace atomic absorption spectrometry GFAAS
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https://www.at-spectrosc.com/as/article/abstract/201606006