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Counter-current mixer-settler studies for actinide partitioning were carried using N,N,N ,N -tetra-2-ethylhexyl diglycolamide (T2EHDGA) as the extractant. The feed solution was Simulated High Level Waste of Pressurized Heavy Water Reactor (PHWR-SHLW) origin spiked with 241 Am, 244 Cm, 152 Eu, 137 Cs, 85,89 Sr, 59 Fe, 106 Ru, 109 Pd, 95 Zr, and 99 Mo tracers. The organic stream was 0.1 M T2EHDGA + 5% isodecanol in n-dodecane. Extraction, scrubbing, and stripping experiments were performed by maintaining an organic to aqueous phase ratio of 1. More than 99.9% of the trivalent actinides and lanthanides were extracted in four stages, and the decontamination factors (D.F.) values were >10 3 obtained for most fission products. The co-extraction of Zr and Pd was prevented by the addition of oxalic acid and N-(2-hydroxyethyl)-ethylenediamine-triacetic acid (HEDTA) into the feed solution. However, ∼20% Ru and 10% Mo was extracted into the organic phase, which was successfully scrubbed using a mixture of 0.2 M oxalic acid and 0.1 M HEDTA in 5 M HNO 3 . Finally, the extracted actinides and lanthanides were quantitatively stripped with 0.2 M HNO 3 . Raffinate of the extraction cycle was found to be free from any alpha activity.

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