Investigations on the Interaction of EDTA with Calcium Silicate Hydrate and Its Impact on the U(VI) Sorption

The interaction of EDTA with calcium silicate hydrate (C-S-H) and its impact on the sorption U(VI) by C-S-H in presence at varying concentrations has been investigated under N2 ambient atmosphere. solid phase characterization was performed FTIR, XRD TGA measurements uranium concentration solution determined alpha-spectroscopy. At increased ([EDTA] > 0.1 M) is complexed extensively extracted from resulting a quantitative dissolution Ca(OH)2 deterioration C-S-H. lower ? 0.01 M), sorbed into associated adsorption capacity (qmax = 0.67 mol/kg) evaluated fitting corresponding data Langmuir isotherm model. incorporation matrix corroborated measurements. Regarding effect C-S-H, evaluation experimental reveal significant decrease Kd values most probably due to stabilization form U(VI)-EDTA complexes solution. Under conditions further observed because formation U(VI)-carbonato related CO2 hydrolysis.