L'extraction des lanthanides et des actinides par les oxydes d'alkylphosphine: Tome IV. L'extraction des cations trivalents par les oxydes de tri-n-butylphoshine et de tri-n-octylphosphine

The extraction of trivalent lanthanides and actinides by trialkylphosphine oxides is based on the equilibrium Me_a³⁺3+NO_3a^-+3 Alk₃PO₀ ⇌ Me(NO₃)₃·3 Alk₃PO₀ At constant ionic strength (sodium nitrate 2 M), the equilibrium constants for the complex formed between tri-n-octylphosphine oxide in n-octane and ²⁴¹Am or ²⁴⁴Cm have been calculated; the values are respectively(2.9±0.5)·10⁷M^-3 and (1.7±0.15)·l0⁷M^-3.The distribution of lanthanides and actinides between, 0.1 M tri-n-butylphosphine oxide in benzene and nitric acid solutions of different concentrations was examined and discussed.