An analytical procedure was developed for determining trace elements relative to uranium(U) in quality control–certified reference samples (i.e., CRM-124-1 and CUP-2) by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectroscopy (OES), after the extraction of U from nitric acid into 30% tributyl phosphate diluted in dodecane or kerosene. The separation eliminated isobaric and polyatomic interferences in ICP-MS and spectral interferences in ICP-OES related to U, which allowed direct analysis of the raffinate stream. The process was validated against UTEVA column separations. Extraction and stripping tests were used to determine distribution ratios and decontamination factors for nearly 67 elements.

Measuring trace impurities in uranium by ICP-MS and ICP-OES after matrix separation by solvent extraction with TBP

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