Mn. Litvina et al., EXTRACTION FROM HNO3 SOLUTIONS AND SEPARATION OF PU(IV) FROM AM(III) BY DIPHENYL(DIALKYLCARBAMOYLMETHYL)PHOSPHINE OXIDES, Radiochemistry, 36(4), 1994, pp. 359-363
Five carbamoylmethylphosphine oxide (CMPO) extractants with phenyl sub
stituents on the P atom and alkyl groups (butyl, octyl, isoamyl) or cy
clic hydrocarbons (piperidine, morpholine) on the N atom are used to s
tudy the extraction of Pu(N) from HNO3 solutions by CMPO in a polar ar
omatic fluorinated diluent as a function of [HNO3] and [CMPO]. All stu
died CMPOs quantitatively extract Pu(lV) from HNO3 with distribution c
oefficients that are 2-3 orders of magnitude greater than those of Am(
III). The elements Pu and Am can be separated during back-extraction.