Carrier mediated transport of actinides using hexa–n-hexylnitrilotriacetamide (HHNTA)

Solutions of N,N,N’,N’,N”,N”-hexa-n-hexylnitrilotriacetamide (HHNTA) in 20 % isodecanol-80 n-dodecane (v/v) were employed for the supported liquid membrane (SLM) transport U(VI), Np(IV), and Pu(IV) from nitric acid feed solutions using PTFE (polytetrafluoroethylene) flat sheet membranes. Preliminary studies revealed poor U(VI) when compared with that tetravalent ions Np(IV) which may find application their separation acidic radioactive feeds. In view this, all subsequent carried out Pu(IV). The SLM performed 0.08 M HHNTA as carrier extractant indicated increased actinide increasing concentrations, while 0.5 HNO3 + oxalic strip (or receiver) phase composition. However, > 80 was obtained a 3 HNO3, sharp decrease rate seen at acidity 6 probably due to anionic hexanitrato complex formation metal also because lower availability free ligand higher concentrations. stability suggesting need continuous replenishment long term use.