Abstract
The extraction of microquantities of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y from NH4NO3 and HNO3 solutions by phosphoryl-containing aza- and diazacrown ethers in organic diluents or on macroporous polymeric supports has been studied. An increase in the number of Ph2P(O)CH2C(O)-groups tethered to a macrocyclic fragment favors the extraction of rare-earth metal ions. The extractive efficiency of the macrocyclic compounds containing Ph2P(O)CH2C(O)-groups is compared with that of diphenyl-N,N-diethyl-carbamoylmethylphosphine oxide (DPhDECMPO).
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