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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

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✦ 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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