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

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...

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Bibliographic Details
Published in:Journal of AOAC International 2000, Vol.83 (1), p.220-223
Main Authors: SOARES, M. E, BASTOS, M. L, FERREIRA, M
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chromatography, Ion Exchange
Chromium - analysis
Food industries
Food Preservation
Fundamental and applied biological sciences. Psychology
Humans
Hydrogen-Ion Concentration
Infant Food - analysis
Research and development. New food products, dietetic foods and beverages
Sensitivity and Specificity
Spectrophotometry, Atomic - methods
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Summary: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 micrograms/L, and the linearity range under optimized conditions was 1.8-50.0 micrograms/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 micrograms/L), and the recoveries were all > 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 to 75 ng/g.
ISSN:1060-3271
1944-7922
DOI:10.1093/jaoac/83.1.220