Abstract
Extraction chromatography with commercially available UTEVA resin (for uranium and tetravalent actinide) was applied for the separation of Th and U from control solutions prepared from a multi-element control solution and from sample solutions of solidified simulated waste. Thorium and U in control solutions with 1–5 mol/dm 3 HNO 3 were extracted with UTEVA resin and recovered with a solution containing 0.1 mol/dm 3 HNO 3 and 0.05 mol/dm 3 oxalic acid to be separated from the other metallic elements. Extraction behavior of U in the sample solutions was similar to that in the control solutions, but extraction of Th was dependent on the concentration of HNO 3. Thorium was extracted from 5 mol/dm 3 HNO 3 sample solutions but not from 1 mol/dm 3 HNO 3 sample solutions. We conjecture that thorium fluoride formation interferes with extraction of Th. Addition of Al(NO 3) 3 and Fe(NO 3) 3, which have higher stability constant with fluoride ion than Th, does improve extractability of Th from 1 mol/dm 3 HNO 3 sample solution.
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