Abstract
The technique of resonance ionization mass spectrometry (RIMS) has been applied to elemental chromium determination in standard (NIST) human urine samples. RIMS combines multistep photoionization with mass spectral sorting and detection of the resultant ions to provide high sensitivity and selectivity. The Cr concentration in a NIST standard urine sample has been determined using RIMS/isotope dilution techniques to be 0.093 ± 0.008 μg ml in good agreement with the 0.085 ± 0.006 μg/ml certified value. The results indicate the utility and selectivity of RIMS in isotope dilution analysis of biological samples of complex matrix and history.
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