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 a...

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Veröffentlicht in:Analytical chemistry (Washington) 2003-07, Vol.75 (13), p.3168-3174
Hauptverfasser: Monsallier, Jean-Marc, Schüssler, Wolfram, Buckau, Gunnar, Rabung, Thomas, Kim, Jae-Il, Jones, Dominic, Keepax, Rose, Bryan, Nick
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac020668r