In this paper, systematic studies are performed to identify the parameters that influence selective separation of actinides from a mixture with lanthanides in small channels. particular, dioxouranium metal ions (UO2+2) binary U(VI)/Er(III) nitric acid solution by an organic TBP/kerosene (Exxsol D80) phase, relevant spent nuclear fuel reprocessing is investigated. The effects such as TBP concent...