[en] The possibility of separation of Pb²⁺ and Ba²⁺ ions from Ce³⁺, Zn²⁺, UO₂²⁺ ions by use of crown ether extraction, is studied. Use of the extraction method with macrocyclic ethers for the extraction of superheavy elements 113⁺ and 114²⁺ from the targets, is shown. Pb²⁺ and Ba²⁺ ions are chosen for the investigation, because their ionic radii (0.12 nm and 0.135 nm, respectively) are close to ionic radii of elements 113⁺ and 114²⁺. For the extraction 18-crown-6- ether (ring size 0.13-0.16 nm), 15 crown-5-ether (0.09-0.11 nm) and dicyclohexyl-18-crown-6-ether are used. The effect of the ligand ring size, efficiency of extraction and reextraction of the elements depending on pH of the aqueous phase, is studied