Selective determination of chromium (VI) in powdered milk infant formulas by electrothermal atomization atomic absorption spectrometry after ion exchange

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Soares, ME (Autor) Outra; Bastos, ML (Autor) FFUP; Ferreira, M (Autor) Outra

Revista

Título: Journal of AOAC International

Vol. 83

Páginas: 220-223

ISSN: 1060-3271

Editora: AOAC INTERNATIONAL

Indexação

ISI Web of Knowledge - 13 Citações

Scopus - 11 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

Outras Informações

ID Authenticus: P-001-1QN

Abstract (EN): A previously developed method was adapted to the selective determination of hexavalent chromium in powdered milk infant formulas. The species in reconstituted milk was separated on an ion-exchange column, Chromabond NH2, and measured by electrothermal atomization atomic absorption spectrometry, The detection limit was 1.8 mu g/L, and the linearity range under optimized conditions was 1.8-50.0 mu g/L. The precision values were 4.1 and 6.5% for the analytical and overall procedures, respectively. The procedure was validated by the method of standard additions (5.0, 10.0, and 25.0 mu g/L), and the recoveries were ail > 93%, The developed method is sensitive, accurate, and precise for determination of Cr(VI) in powdered milks. It was applied to the determination of Cr(VI) in 20 commercial brands, i.e., 7 infant formulas, 5 follow-up milks, and 8 dietetic milks. The values found ranged from < 10 in to 75 ng/g.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4