Extraction of Lanthanides with Halogen Substituted 4-Acyl-Pyrazolones

摘要

Equilibrium extraction behavior for a series of representative tervalent lanthanide ions, La, Pr, Eu, and Yb, using chloroform solutions containing halogenated derivatives of 4-acyl-1-phenyl-3-methyl-5-pyrazolone have been studied. The results demonstrate that these lanthanides are extracted as simple chelates, LnL sub 3 . The equilibrium constants of these extraction reactions have been calculated. The relationships between the acid dissociation constants, K/sub a/, determined by a two-phase titration method, distribution constants, K/sub DR/, and the extraction equilibrium constants, K/sub ex/, are discussed. 14 refs., 5 figs., 5 tabs. (ERA citation 10:037184)