Determination of uranium and plutonium in uranium-plutonium--Fission element alloys

Extraction of Pu3+, Pu4+ and PuO2+ 2 from Various Mineral Acid Solutions by Tri-n-butylphosphate and Di-(2-ethylhexyl)-orthophosphoric Acid

“…The K¿ values found for TBP-HC1 are in good agreement with reported distribution coefficients [15,16], where a reversal of the extraction orders of Pu (IV) and Pu (VI) had already been stated. For TBP-HCIO4 extractions only two K¿ values are found in literature, dealing with the extraction of PuC>2 + [17], Those are consistent with the data obtained in this work.…”

Amperometric Titration of Plutonium(VI) with Iron(II).

“…The low recovery and lack of precision are very probably attributable to incomplete precipitation rather than difficulties in the titration. Separation from a 200-fold excess of magnesium was effected by an extraction of plutonium(IV) from hydrochloric acid into 30% tributyl phosphate-carbon tetrachloride solution (6). Recovery was 99.9% with a relative standard deviation of 0.2%.…”

“…There are, nowever, a number of proved separation methods which will with comparative ease selectively remove plutonium from all these interfering elements. In strong hydrochloric acid plutonium(IV) can either be extracted with 30% tributyl phosphate-inert diluent (6) or adsorbed on Dowex-1 anion exchange resin (9). Back extraction or elution is effected with dilute hydrochloric acid plus a reducing agent.…”

“…Helbig carried out his titrations at the 0.1-and l-^g. levels with relative standard deviations of ±6 (6) Petrow, H. G., Sohn, Bernard, Allen, R. J., Anal. Chem.…”

X-Ray Emission Analysis of Plutonium and Uranium Compound Mixtures.

“…One of these systems is composed of a mixture of uranium and plutonium oxides in concentrations ranging from 0.5 to 25% Pu02 and 75 to 99.5% U02. Analysis of such mixtures is a rather long process requiring separations (7). acid medium without separating rhodium from it, is approximately 99%, and the relative standard deviation of the procedure is 1.02%.…”