Chromium is most usually determined in urine by Graphite Furnace Atomic Absorption Spectrometry, although it has been shown that an accurate background correction system that is free of emission breakthrough effects at the high wavelength normally used for chromium is essential. Sensitivity and detection limits are such that it is necessary to use solvent extraction procedures, or to analyse undiluted urine to accurately measure normal levels, although samples from exposed subjects can be diluted as necessary. 

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