May 11 – 16, 2014
Casino Conference Centre
Europe/Prague timezone

Actinide stripping by a hydrophilic BTP ligand in aqueous HNO3 from TODGA-containing organic phase

May 12, 2014, 4:30 PM
Red Hall (Casino Conference Centre)

Red Hall

Casino Conference Centre

Reitenbergerova 4/95, Mari&#225;nsk&#233; L&#225;zn&#283;, Czech Republic <font color=white>
Verbal Separation Methods, Speciation Separation Methods, Speciation 1


Mr Łukasz Steczek (Institute of Nuclear Chemistry and Technology)


N,N,N′,N′-tetraoctyl-diglycolamide (TODGA) is broadly studied as a non-specific extractant for actinides and lanthanides from HNO3 solutions of nuclear waste, in particular for group actinide extraction (GANEX process). Geist and his coworkers proposed a novel hydrophilic ligand, 2,6-bis(5,6-di-(sulfophenyl)-1,2,4-triazin-3-yl)pyridine (SO3-Ph-BTP) for selective stripping of actinides(III) from the loaded organic phase [A. Geist et al., Solvent Extr. Ion Exch., 30, 433 (2012)], and determined (by TRLFS) the stability constants of its consecutive (from 1:1 to 1:3) complexes with Cm(III) and Eu(III) in aqueous solutions [C.M. Ruff et al., Dalton Trans., 41, 14594 (2012)]. In the present work, we studied the distribution of some actinides(III-VI) in the two-phase systems: TODGA (in kerosene) / SO3-Ph-BTP (0–100 mM in aqueous HNO3); and determined the apparent stability constants of their complexes in the aqueous phase, based on the distribution ratios of the metal ions. The effect of protonation of the SO3-Ph-BTP ligand in the acidic solutions was discussed. This work was financed from the National Centre for Research and Development through the Strategic Program Technologies Supporting Development of Safe Nuclear Power Engineering, task 4: Development of spent nuclear fuel and radioactive waste management techniques and technologies.

Primary author

Mr Łukasz Steczek (Institute of Nuclear Chemistry and Technology)


Mr Jerzy Narbutt (Institute of Nuclear Chemistry and Technology) Mrs Magdalena Rejnis (Institute of Nuclear Chemistry and Technology)

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