Effect of ionic liquids on the extraction of Am from HNO3 solutions with diphenyl(dibutylcarbamoylmethyl)phosphine oxide in dichloroethane

Research paper by G. A. Pribylova, I. V. Smirnov, A. P. Novikov

Indexed on: 09 Oct '12Published on: 09 Oct '12Published in: Radiochemistry


Addition of small (1–5 vol %) amounts of ionic liquids (ILs) increases the Am(III) distribution ratio in the system with diphenyl(dibutylcarbamoylmethyl)phosphine oxide (Ph2Bu2) by more than 2 orders of magnitude. With 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C4mim]+Tf2N−) used as IL, the Am(III) extraction is possible even from 8 M HNO3, which is important in radiochemical analysis of process and environmental samples, because many procedures are based on the transfer of solid samples into 8 M HNO3. The extraction data show that the extractable Am(III) complex contains three Ph2Bu2 ligands, an IL anion, and two NO3− anions.