| abstract |
(57) [Summary] (Corrected) [Structure] Thioether, or Formula: thioether (wherein having a radical group, R 1 and R 2 may be the same or different but represent an alkyl group, R 3 represents an alkyl group, and A represents the formula: — (CH 2 ) m — — (CH 2 ) n —X— (CH 2 ) p '-CH- R 3 (wherein, either m is equal to 0, with an integer from 1 to 6, n and p Is an integer of 1 to 6 and X is 0 or S) is a divalent radical group selected from radical groups), and an organic extractant having a component) is brought into contact with an aqueous palladium-containing solution to extract And a palladium complex, and b) separating the palladium-depleted aqueous solution from the palladium complex produced in step a). [Effect] Palladium existing in the nitric acid aqueous solution for dissolving the irradiated nuclear fuel element is recovered. |