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 recon stituted 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 con ditions 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 validat ed by the method of standard additions (5.0, 10.0, and 25.0 mu g/L), and th e recoveries were ail > 93%, The developed method is sensitive, accurate, a nd 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 formul as, 5 follow-up milks, and 8 dietetic milks. The values found ranged from < 10 in to 75 ng/g.