title: Complexation and back extraction of various metals by water-soluble diglycolamide.
abstract: Water-soluble ligands, N,N,N',N'-tetramethyldiglycolamide (TMDGA), N,N,N',N'-tetraethyldiglycolamide (TEDGA), N,N,N',N'-tetrapropyldiglycolamide (TPDGA) and N,N-dipropyldiglycolamic acid (DPDGAc) were prepared and their abilities to complex with and to back-extract the metal cations were investigated. These results indicate that the DGA series and DPDGAc have a stronger complexing ability with Am(III) and Pu(IV) than comparable carboxylic and aminopolycarboxylic acids. Among these ligands, the trend of the strength of their complexing ability is TPDGA approximately TEDGA > TMDGA approximately DPDGAc. TPDGA has significant loss to the extraction solvent due to its high hydrophobicity. It is evident from the present work that TEDGA is the best reagent for the reverse-extraction of not only An(III), (IV) but also Ca(II), Sc(III), Y(III), Zr(IV), La(III), Hf(IV), and Bi(III).
authors.affiliation: Japan Atomic Energy Agency, Japan. sasaki.yuji@jaea.go.jp
authors.forename: Yuji
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Yumi
authors.initials: Y
authors.lastname: Sugo
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kitatsuji
authors.forename: Akira
authors.initials: A
authors.lastname: Kirishima
authors.forename: Takaumi
authors.initials: T
authors.lastname: Kimura
authors.forename: Gregory R
authors.initials: GR
authors.lastname: Choppin