The effect of EDTA on the groundwater transport of thorium through sand

Application of a γRS index-based method and techno-economic analysis for in situ treatment of 137 Cs-contaminated soils by cement-barite based stabilisation/solidification

“…Soil radioactive contamination was simulated using 232 thorium ( 232 Th) as g-ray emitter. S/S shielding properties and gRS index were shown not to be dependent on the contamination activity in soil and this results in the possibility of using low-activity contaminants such as 232 Th as analogue of high radiotoxicity elements (Falciglia et al, 2015;May et al, 2012). Artificial contamination procedure was performed by mixing the selected soil with ThO 2 in order to obtain a final 232 Th concentration of 5.0% (w/w).…”

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

“…232 Th IV is therefore often used as an analogue of other high radiotoxicity radionuclides like Pu III , Pu IV , americium Am III and U IV (May et al, 2012). 232 Th also presents leaching and sorption properties and interaction mechanism with cement hydration products similar to Pu and U (Ahmed et al, 2012).…”

Synthesis and characterization of homo- and heteronuclear molecular Al3+ and Th4+ species chelated by the ethylenediaminetetraacetate (edta) ligand

“…May et al, 2012 observed that the presence of edta increased the concentration of Th in solution, but the transport was also dependent on the concentration of the chelator and overall flow rate. 22 Much of the behavior, especially in less concentrated solutions could be explained by the presence of monomeric Th species and interaction of the edta with the sand particle surfaces; however, large differences between the dilute (0.4 mM Th) and more concentrated (4 mM Th) could not be explained by the simple monomer. The formation of colloidal particles was suggested as an important factor in determining transport and edta was implicated as an important stabilization agent for these species.…”

“…Mixed-metal colloids may occur within natural aqueous systems and also impact the mobility of the actinide species within the environment. 14,22 The formation of heterometallic species can cause unexpected increases in actinide solubilities and impact the mobility and bioavailability of the metal in solution. [23][24][25] Hydrolysis of metals in solution also has the potential to form larger molecular complexes that are difficult to identify using traditional potentiometric and spectroscopic techniques.…”