METHOD FOR SELECTIVE SEPARATION OF TRIVALENT AND TETRAVALENT ACTINOIDS FROM TRIVALENT LANTHANOIDE USING HYBRID DONOR-TYPE EXTRACTING AGENT HAVING FUNCTIONAL GROUP CARRYING ACTIVE OXYGEN AND NITROGEN ATOMS

摘要

Disclosed is a method for the separation and collection of a trivalent and tetravalent actinoids in a simple manner and at low cost without the need of using any organophosphorus compound. A tetravalent actinoid plutonium (Pu (IV)) and trivalent actinoids americium (Am (III)) and curium (Cm (III)) can be selectively separated and collected from a trivalent lantanoide (Ln (III)) or the like by using an extracting agent having a neutral multidentate functional group which is a hybrid donor-type organic compound having both of a donor atom for an oxygen atom and a donor atom for a nitrogen atom.