title: Kinetic investigation of Eu(III)-humate interactions by ion exchange resins.
abstract: The kinetic stability of radionuclides bound to aqueous colloids is a determining factor in their migration from a radioactive waste repository. The cation exchangers Chelex-100, Dowex 50Wx4, and Cellphos (cellulose phosphate) have been shown a promising tool for kinetic investigations. This study assesses the applicability of different exchange resins for Eu humate dissociation kinetics investigations. All resins were found to produce satisfactory results. A systematic study of parameters affecting the dissociation rates of Eu(III) humate complexes was performed. A set of purified humic substances was found to behave in the same way. However, unpurified Aldrich humic acid showed significant differences.
authors.affiliation: Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Monsallier
authors.forename: Wolfram
authors.initials: W
authors.lastname: Schüssler
authors.forename: Gunnar
authors.initials: G
authors.lastname: Buckau
authors.forename: Thomas
authors.initials: T
authors.lastname: Rabung
authors.forename: Jae-Il
authors.initials: JI
authors.lastname: Kim
authors.forename: Dominic
authors.initials: D
authors.lastname: Jones
authors.forename: Rose
authors.initials: R
authors.lastname: Keepax
authors.forename: Nick
authors.initials: N
authors.lastname: Bryan
mesh_terms: D005063:Europium / Q000737:chemistry*; D006812:Humic Substances; D007475:Ion Exchange Resins; D007700:Kinetics; D009942:Organometallic Compounds / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D007475:Ion Exchange Resins; D009942:Organometallic Compounds; D005063:Europium