abstract |
(57) [Summary] [Purpose] S, which is a pyrogenic long-lived nuclide from highly radioactive liquid waste. In order to enable the removal of r, an extractant having selectivity for Sr in aqueous solution is provided. [Structure] The extractant of the present invention has the following structural formula (In the formula, M is Cu (II), Zn (II) or Ni (II) Represents the metal ion of. 1,2-benzenebis (1,4-dioxanonyl-6,8-dionate) metal complex having |