Role of complex formation with humic substances in the redistribution of trivalent rare earth elements and actinides

摘要

The influence of complex formation with humic substances on the dissolved species and solid-water distributions of trivalent rare earth elements and actinides was investigated using the following procedures: (1) determining the stability constants of humate complexes of rare earth and actinide ions and other metal ions; (2) studying the effect of humate formation on the sorption behavior of these ions on kaolinite; (3) direct observation of actinide(III) species sorbed on montmorillonite in the presence of fulvic acid by laser-induced fluorescence spectroscopy.