Colorimetric determination of iron in infant fortified formulas by sequential injection analysis

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

Araujo, AN (Autor) FFUP; Gracia, J (Autor) Outra; Lima, JLFC (Autor) FFUP; Lucia, MPM (Autor) Outra; Saraiva, MFS (Autor) FFUP

Revista

Título: Fresenius' Journal of Analytical Chemistry

Vol. 357

Páginas: 1153-1156

ISSN: 0937-0633

Editora: Springer

Indexação

ISI Web of Knowledge - 16 Citações

Scopus - 17 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-BP1

DOI: 10.1007/s002160050322

Abstract (EN): A procedure is described for the colorimetric determination of iron in infant fortified formulas based on sequential injection analysis (SIA). Iron(III) complexation with thiocyanate is used as colour developing reaction. The system enables the determination of iron in the samples (after digestion by dry ashing and treatment with 0.2 mol/L nitric acid in the range of 0.50-20.0 mg/L, consuming 140 mu L of the sample and 8 mg thiocyanate per determination. The reactor geometry and the adjustment of the ionic content of the calibration solutions is important for the accuracy of the results. A regression line according to the equation [Fe(III) (mg/L)](SIA) = - 0.3(+/- 0.4) + 1.03(+/- 0.04) [Fe(III) (mg/L)](FAAS) was obtained after comparative analysis of a set of 12 samples. The measurement rate was 34 s, thus allowing to analyze 100 samples per hour with a relative standard deviation lower than 2%.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4