PERIODIC VARIATIONS OF LANTHANIDES YKERGIC EXTRACTION BY THENOYLTRI-FLUOROACETONE AND TRIPHENYLPHOSPHINE OXIDE MIXTURE*
作者:
H.F. Aly,
S.M. Khalifa,
N. Zakareia,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1984)
卷期:
Volume 2,
issue 6
页码: 887-898
ISSN:0736-6299
年代: 1984
DOI:10.1080/07366298408918480
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The synergic extraction of the different lanthani-des, except Pm and Lu, by thenoyltrifluoroacetone (HTTA) and triphenylphosphine oxide (TPPO) mixture in benzene from an aqueous perchlorate medium of constant ionic strength of 0·2 was investigated. It was found that the main adduct extracted contains the lanthanide chelates together with two TPPO molecules. The different extraction and formation constants for the lanthanides investigated have been determined. The variations of the logarithmic values of the chelate extraction constant and the adduct formation constant with the different lanthanides was discussed in the light of the tetrad and the inclined-W effects. The experimental results showed that the nature of coordination by adduct formation for the Yb-Sm group is different than that of the Pr-La group.
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