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Updated: Sep 20, 2026

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
Kinetic investigation of Eu(III)-humate interactions by ion exchange resins
Jean-Marc Monsallier1, Wolfram Schüssler, Gunnar Buckau
1Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany.
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.
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