Determination of uranium after separation using solvent extraction from slightly nitric acid solution and spectrophotometric detection

Liquid–liquid extraction of hexavalent uranium from 0.75 M nitric acid media by tributyl phosphate (TBP)/kerosene was briefly studied, in the present work to eliminate interference effects caused by Fe, Zr, Ln, Th and other elements in the determination of uranium. For this purpose, all factors affecting the extraction process (time of mixing, TBP concentration, temperature, pH, salting out effect, diluent type, effect of interfering elements) and stripping processes were investigated. The free energy ΔG, enthalpy ΔH and entropy ΔS were identified proving exothermic and spontaneous reaction of the present extraction process. The proposed procedure was applied on the extraction and determination of uranium in rocks using arsenazo III.