SummaryThe liquid-liquid extraction of tracer amounts of Pu(IV) from 0.5 and 3 M nitric acid solutions by a mixture A + B, of two quaternary ammonium nitrates of a high molecular weight, or of one such nitrate with a long-chain tertiary amine nitrate in chloroform and in the octanol containing solvents n-dodecane or o-xylene has been studied.The Pu(IV) distribution coefficientsThe extracting agents used are: trilaurylamine (TLA), trilauryl-methylammonium nitrate (TLMA) and hexadecyl-dimethyl-benzyl ammonium nitrate (HDDMBA).Thermodifferential molecular weight determinations of quaternary ammonium nitrates and their Th(IV) and U(VI) nitrate complexes in benzene show a higher degree of association for the metal complexes than for the extracting agents. By saturation of solutions of different quaternary ammonium nitrates in benzene with Th(NO
Q + 0 4 5-Q0 4 (Kqo,) On a trouvé que ces constantes sont KQO = 28 M -1 et KQO, -230 M -1 pour TLMA ainsi que pour HDDMBA en milieu o-xylène + octanol, KQO, = 1500 M -1 pour TLMA en milieu n-dodécane + octanol, et on estime que KQO, = 630 M -1 pour HDDMBA en milieu n-dodécane + octanol.
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