How Phase Modifiers Disrupt Third-phase Formation in Solvent Extraction Solutions

Effect of metal complexation on diglycolamide radiolysis: a comparison between ex situ gamma and in situ alpha irradiation

“…2). These species have already been reported for the extracted Nd 95 and are consistent with the Am : TODGA stoichiometries reported in the literature indicating the presence of complexes Am : TODGA from 1 : 2 to 1 : 4 depending on the polarity of the diluent. 3,8,82,[96][97][98][99][100][101][102] Radiolysis of TODGA-Am solutions.…”

“…ESI-MS generally used to identify organic compounds in solution can also be used to probe metallic complexes existing in solution. 60,[83][84][85][86][87][88][89][90][91][92][93][94][95] The ESI-MS spectrum was collected for each TODGA-Am solution in order to identify the species coming from the free ligand or being involved in metallic complexes. The main species identified before degradation in these systems are the free ligand and Am spcies.…”

“…However, in previous studies, molecular dynamics simulation analysis of TODGA solutions (in dodecane with 5% of octanol) after Nd extraction in macroconcentration showed that the metallic cation was directly bounded to the TODGA ligand, nitrate and even octanol molecules. 95 With high Am concentration (10 mmol L À1 Am for 0.1 mol L À1 TODGA), similar structural organization in the organic phase is expected and the irradiation source is trapped inside a TODGA complex, essentially issuing from within the complex. Thus, the degradation products formed through direct radiolysis are still more likely than with gamma irradiation.…”

Insights into the Third Phase Formation Behaviour of N,N‐Didodecyl‐N’,N’‐Dioctyl Diglycolamide in n‐Dodecane Investigated by Dynamic Light Scattering and FTIR Spectroscopy

“…Among the various DGAs, the N , N , N ’, N ’‐tetraoctyl diglycolamide (TODGA) and N , N , N ’, N ’‐tetra‐2‐ethylhexyl diglycolamide (TEHDGA) are popular ligands extensively studied for the extraction of trivalent metal ions from nitric acid solutions representing HLLW [3–8] . However, these ligands have some limitations such as third phase formation, extraction of unwanted metal ions, etc., during the extraction of trivalent actinides and lanthanides from HLLW [9,10] …”

Role of diluent in the unusual extraction of Am3+ and Eu3+ ions with benzene-centered tripodal diglycolamides: local structure studies using luminescence spectroscopy and XAS

“…35 Alcohols are known to form different structural units in an aliphatic solvent with different solvation properties; more details can be found in the literature. 36,37 The addition of IDA increases the overall polarity of the organic phase, which may facilitate the solubility of the relatively polar metal-ligand solvate in the organic phase [38][39][40][41][42][43] and, hence, favour the extraction of the trivalent Ln 3+ /An 3+ by L I compared with L II . Typically, the extraction of Am 3+ increased upon increasing the IDA content in n-dd, suggesting a better solvation of the Am 3+ -L I solvate compared with that in pure n-dd.…”