Solvent Extraction of Am(III), Cm(III), and Ln(III) Ions from Simulated Highly Active Raffinate Solutions by TODGA Diluted in Aliquat-336 Nitrate Ionic Liquid

Selective Extraction of Americium from Curium and the Lanthanides by the Lipophilic Ligand CyMe4BTPhen Dissolved in Aliquat-336 Nitrate Ionic Liquid

“…The method of distribution ratio calculation according to Equation 2 was previously validated against the method based on Equation 1 using ICP-MS measurements for stable Eu(III) and γ-measurement for 152 Eu tracer. [32] The distribution ratio of stable lanthanide ions could be determined by the ICP-MS method with +/-10 % combined uncertainty at 2 σ confidence level.…”

“…It was found in previous studies that [A336][NO3] slightly extracts trivalent metal ions itself. [32] Masking of metal ions by TEDGA resulted in a factor of three lower distribution ratios for Am(III) and Cm(III), and in a factor of 14 lower distribution ratios for Eu(III), compared to extraction by [A336][NO3]. [32] Former speciation studies related to the EXAm process [14] showed the presence of heteroleptic metal complexes with the lipophilic extractant DMDOHEMA and TEDGA in the organic phase.…”

“…[32] Masking of metal ions by TEDGA resulted in a factor of three lower distribution ratios for Am(III) and Cm(III), and in a factor of 14 lower distribution ratios for Eu(III), compared to extraction by [A336][NO3]. [32] Former speciation studies related to the EXAm process [14] showed the presence of heteroleptic metal complexes with the lipophilic extractant DMDOHEMA and TEDGA in the organic phase. In the present study, the distribution ratios of all the three metal ions remained low for contact times as long as 25 h, suggesting, that the trivalent metal-TEDGA complexes are quantitatively retained in the aqueous phase.…”

“…The ionic liquid [A336][NO3] was recently tested in combination with the hard-donor extractant TODGA for the An(III) + Ln(III) co-extraction from a simulated HAR solution and was found to be an interesting alternative to molecular diluents like n-dodecane. [32] Ionic liquids have a low vapor pressure and high conductivity which ensures quasi non-flammability and resistance against static charge build-up. Besides, in a recent study, the trioctylmethylammonium nitrate ([N1888][NO3]) based solvent proved to show higher radiation stability than the n-dodecane based solvent.…”

Solvent Extraction Studies for the Separation of Trivalent Actinides from Lanthanides with a Triazole-functionalized 1,10-phenanthroline Extractant

“…20 The ionic liquid [A336][NO3] was recently also tested in combination with the hard-donor extractant TODGA for the An(III) + Ln(III) coextraction from a simulated HAR solution and was found to be an interesting alternative to molecular diluents like n-dodecane. 27 Moreover, TODGA was found to have a higher radiation stability in [A336][NO3] than in aliphatic diluents. 28 The effect of replacing 2 (1,2,4-) triazine moieties by 2 (1,2,3-) triazole moieties in the case of the BTP complexants for An(III) and Ln(III) separation was demonstrated in the hydrophilic, tridentate complexant 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl)]pyridine (PyTri-Diol).…”