Abstract
The extraction of 10 rare-earth traces into solutions of HDEHP in toluene, containing a macroquantity of uranium(VI), from aqueous solutions of nitric acid has been investigated in order to check the mechanism. Under the condition that the concentration of HDEHP is many times that of uranium(VI) (HDEHP/U(VI) ≥ 5), the mechanism of rare-earth extraction is the same as in uranium(VI)-free systems. This is indicated by the third-order dependence of the distribution ratios upon the extractant concentration, which has to be corrected for the preferential complexing of uranium(VI). The tetrad effect, which characterizes extraction and partition Chromatographic behaviour of rare earths is observed in this complex system.
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