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

• 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
• ISSN: 1060-3271; 1944-7922
• DOI: 10.1093/jaoac/83.1.220

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.