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ABSTRACT
A new extractant biuret(C8) is synthesized and tested for solvent extraction of hard acid metals, for example, actinides, and soft acid metals. This compound has a central frame similar to that of malonamide but with an additional amino functional group introduced into the central framework; in this case, both the amidic oxygen atoms and the amino nitrogen atom may bond with metals. We found that both hard and soft acid metals can be extracted from nitric or perchloric acids to n-dodecane using biuret(C8). It is clear that D(Pd, Pu, U) values of approximately 100 can be obtained using 0.1 M biuret(C8)/n-dodecane.
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Acknowledgments
The authors would like to deeply thank the staff of Wako Pure Chemical Industries for the organic synthesis of the extractants and Dr. K. Morita and Mr. K. Ito of the Japan Atomic Energy Agency and Prof. K. Yoshizuka of the University of Kitakyushu for the useful discussions.