“…11,13,14 In the presence of hydroxamic acids the distribution ratios for tetravalent Pu and Np by TBP drops significantly due to the formation of strong metal(IV)-hydroxamate complexes. 3,6,8,10,15 Although the metal complexes with FHA and HAHA are rather hydrophilic in character compared to benzohydroxamate complexes, it has been previously reported that, in the presence of HAHA, coextraction of acetohydroxamate complexes of U(VI), 16,17 Mo(VI), 18 Pu(IV), 8 and Np(IV) 19 by TBP is possible. Therefore, to successfully predict distribution ratios of Pu(IV) in the presence of HAHA, a more thorough design of an extraction model is very important.…”