Kinetic investigation of Eu(III)-humate interactions by ion exchange resins.
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.
Monsallier
Jean-Marc
JM
Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany.
Schüssler
Wolfram
W
Buckau
Gunnar
G
Rabung
Thomas
T
Kim
Jae-Il
JI
Jones
Dominic
D
Keepax
Rose
R
Bryan
Nick
N
D005063:Europium / Q000737:chemistry*; D006812:Humic Substances; D007475:Ion Exchange Resins; D007700:Kinetics; D009942:Organometallic Compounds / Q000737:chemistry*
D006812:Humic Substances; D007475:Ion Exchange Resins; D009942:Organometallic Compounds; D005063:Europium