GFAAS determination of selenium in infant formulas using a microwave digestion method
✍ Scribed by Alegria, A. ;Barbera, R. ;Farré, R. ;Moreno, A.
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 226 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0027-769X
No coin nor oath required. For personal study only.
✦ Synopsis
A method for determining the selenium content of infant formulas is proposed. It includes wet digestion with nitric acid and hydrogen peroxide in medium pressure teflon bombs in a microwave oven and determination by graphite furnace atomic absorption spectrometry (GFAAS). The absence of interfercnces is checked. Values obtained for the limit of detection (19.4 ng/g), precision (RSD = 2.2%) and accuracy by analysis of ii reference material show that the method is reliable.
Zusammenfassung
GFAAS-Bestimmung von
Selen in Kindernahrungsinitleln unter Einsati einer Mikrowellen-AufschluR-Mcthode Es wird eiiie Methode zur Bestimmung des Selengehaltes von Kindernahrungsmitteln vorgeschlagen. Sie beinhaltet einen FeuchtaufschluR mit Salpetersiure und Wasserstoffperoxid in einer Mitteldruck-Tetlonbombc im Mikrowellenofen und Bestimmung durch ,,graphite furnace atomic absorption spectrometry"(GFAAS). Das Ausbleiben von Storungen wurde uberpruft. Die erhaltenen Werte fur die Bestimmungsgrenze ( 19,4 ng/g), die Prazision (relative Standardabweichung = 2,2%) und die Genauigkeit durch Analyse einer Referenzsubstanz zeigen, dalj die Methode zuverlissig ist.
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