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The extraction performance and mechanism of 2,9-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo[1,2,4]triazin-3-yl)-1,10-phenanthroline (CyMe 4 BTPhen) in the room temperature ionic liquid 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 4 mim][NTf 2 ]) have been studied and are herein reported. Americium is extracted from nitric acid solutions by cation exchange and is most efficient at low (&lt; 1 M) nitric acid concentrations as opposed to the high (4 M) concentration preferred when using most traditional molecular diluents. The kinetics are slow, taking 24 hours to achieve quantitative extraction of americium but are greatly improved, achieving the same within 8 hours, by dilution with 1-octanol. High SF Am/Eu  &gt; 3000 were achieved although decontamination factors for americium from more complex matrices were non-competitive with extraction using traditional molecular diluents. Modest improvements in decontamination factor were attained by the addition of the hydrophilic reagent  N,N,N ’, N ’-tetraethyl diglycolamide (TEDGA).

Separation of Americium from a Complex Matrix by Solvent Extraction Using CyMe 4 BTPhen in a Room Temperature Ionic Liquid Diluent