Process for the determination of uranium (VI) or dialkyl dithiophosphoric acid present in an organic solvent

摘要

The invention relates to a process for the determination of uranium (VI) or dialkyl dithiophosphoric acid present in an organic solvent. In this process, a dialkyl dithiophosphoric acid or a uranium (VI) salt is added to the organic solvent so as to convert all the uranium or dialkyl dithiophosphoric acid present in said solvent into a mixed uranium (VI) - dialkyl dithiophosphoric acid-organophosphorus compound complex. The optical density of the solvent containing the complex in solution is measured so as to determine the concentration of this solvent in the complex, together with its uranium dialkyl dithiophosphoric acid content. Application to the determination of traces of uranium in tributylphosphate obtained from the reprocessing of irradiated fuels.