| Investigation of some methods for the preparation of four polyaminopolycarboxylic acids: thiobis(ethylenenitrilo)-N,N,N',N'-tetraacetic acid, N,N-bis(2-aminoethyl)aniline-N',N',N'',N''-tetraacetic acid, bis(3-aminopropyl)ether-N,N,N',N'-tetraacetic acid and N,N-bis{lcub}N',N'-dicarboxymethyl-3-aminopropyl{rcub}-N-methylammonioacetate are reported. The coordinating properties of their anions with regard to lanthanide ions have been examined.; Polyaminopolycarboxylates form 1:1 chelate species with trivalent lanthanide ions in aqueous media. The stability constants of their metal chelate species depend upon the size of the chelating rings formed, the basicity of the middle atom in the chain, and the number of coordination points between anion and metal cation.; Tracer level ('241)Am-('155)Eu cation-exchange experiments explore how the relative magnitude of the chelate stability constants affects the separation of members of the lanthanide and actinide series.; *DOE Report IS-T-1046. This work was performed under Contract No. W-7405-Eng-82 with the U.S. Department of Energy. |
