Chemical studies of transactinide elements (atomic number Z ≥ 104) are of great importance to understand the relativistic effects; however, the experimental methodology is limited owing to the single atom situation and short lifetimes of the heavy atoms. Herein, we report the successful establishment of a new solvent extraction method for transactinide elements using a flow-type solvent extraction apparatus. The developed apparatus has a reaction unit in which PTFE chips are packed to shorten the time required for the transfer of metal complexes between the aqueous and organic phases. Equilibrium distribution ratios were obtained for Zr and Hf: the homologues of element 104, rutherfordium (Rf), in a short time considering the half-life of ²⁶¹Rf as 68 s. In addition, the developed extraction apparatus was connected to an online transportation system for the nuclear reaction products at an accelerator, and online solvent extraction experiments were conducted with the short-lived nuclear reaction products of ^89m,gZr and ¹⁷³Hf. Distribution ratios consistent with the equilibrium ratios were successfully acquired. The solvent extraction system for experiments on Rf was thus established, and the optimal experimental conditions were determined.

锕元素化学研究（原子序数Ž ≥104）是非常重要的，了解相对论效应; 然而，由于单原子情况和重原子的短寿命，实验方法受到限制。在本文中，我们报道了使用流动型溶剂萃取装置成功建立了一种新型的用于放线elements元素的溶剂萃取方法。所开发的设备具有一个反应单元，其中装有PTFE碎片，以缩短在水相和有机相之间转移金属络合物所需的时间。考虑到²⁶¹的半衰期，在短时间内获得了Zr和Hf的平衡分布比：元素104的同系物-钌（Rf）Rf为68 s。此外，已开发的萃取设备在加速器上连接了用于核反应产物的在线运输系统，并使用^89m，g Zr和¹⁷³ Hf的短寿命核反应产物进行了在线溶剂萃取实验。成功获得了与平衡比率一致的分配比率。这样就建立了用于Rf实验的溶剂萃取系统，并确定了最佳实验条件。