Abstract
A method is described for the determination of chromium and its enriched stable isotopes in human urine by isotope dilution mass spectrometry. A volatile chelate is formed with trifluoroacetylacetone (TFA) and the fragment ions corresponding to Cr(TFA) 2 + in the 350-360 m/z region are monitored. The chelate is thermally stable and exhibits no memory effect when isotope ratios change. The detection limit for the method is 0.03 ng of Cr/g, and the accuracy is verified by certified reference materials and by an independent method
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