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

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Soares, ME (Author) Other; Bastos, ML (Author) FFUP; Ferreira, M (Author) Other

Journal

Title: Journal of AOAC International

Vol. 83

Pages: 220-223

ISSN: 1060-3271

Publisher: AOAC INTERNATIONAL

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 11 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4