Abstract
Reproducible solutions less than 10−4 M in proctctinium-231 in 1–12 M nitric acid have been prepared and examined. Extraction of Pa by tributylphosphate resembles that of zirconium and equilibrium is rapidly attained. The relative strenghts of fluoro-complexing of Pa(V) and Th(IV) in nitric acid have been derived by similar extraction experiments. Distribution coefficients using butex, solutions of tri-n-octylamine and di(2-ethylhexyl) phosphoric acid in inert organic diluents, and cation and anion exchange resins have also been measured. The protactinium species in nitric acid are interpreted as a series of hydroxo-nitrato complexes.The adsorption of protactinium from these solutions on active solids and a comparison of thorium, uranium and protactinium exchange on ZeoKarb 225 and DeAcidite FF is also reported.
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