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Microwave-assisted sample preparation in sequential injection spectrophotometric determination of magnesium, calcium and iron in food

C C Oliveira R P Sartini; Elias Ayres Guidetti Zagatto

Analytica Chimica Acta Amsterdam v. 413, p. 41-48, 2000

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Título:
Microwave-assisted sample preparation in sequential injection spectrophotometric determination of magnesium, calcium and iron in food
Autor: C C Oliveira
R P Sartini; Elias Ayres Guidetti Zagatto
Assuntos: QUÍMICA ANALÍTICA; QUÍMICA ANALÍTICA INSTRUMENTAL
É parte de: Analytica Chimica Acta Amsterdam v. 413, p. 41-48, 2000
Descrição: A sequential injection system for spectrophotometric analysis of foods and similar involving direct sample introduction as a natural suspension or as slurry is proposed. Sample and concentrated nitric acid are sequentially aspirated and directed towards a digestion bomb located inside a microwave oven where sample decomposition takes place. After digestion, aliquots of the processed sample and randomly selected reagents are sequentially aspirated towards the holding coil and pumped towards the detector. As application, magnesium, calcium and iron were determined in milk, soft drinks and similar by using o-cresolphthalein (with or without EGTA addition) and o-phenanthroline as colour forming reagents. The system is versatile, and yields reproducible results (r.s.d.<0.04 for 5.0-50.0 mgl-1 Mg, 15.0-150 mgl-1 Ca and 2.0-20.0 mgl-1 Fe) in agreement with flame atomic absorption spectrometry involving the manual sample digestion procedure
Editor: Piracicaba
Data de criação/publicação: 2000
Formato: p. 41-48.
Idioma: Inglês

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