研究了Sm~(3+)在EDTA—NH_4Ac(pH=3.0)溶液和五种交联度相同但孔结构各异的磺酸型大孔离子交换树脂间的交换动力学,比较了25℃时的液膜扩散常数,粒内扩散常数、液膜扩散律速所经历的时间和半交换期,得到的结果表明,前报中关于UO_2~(2+)-H~+交换动力学与树脂孔结构间的依赖关系亦适用于本体系,即适当的孔径范围与较高的内扩散常数相联系而高的比表面会增大液膜扩散常数。与UO_2~(2+)传质不同之点在于,高的比表面不能减缩液膜扩散律速所经历的时间,这可能和Sm—EDTA络合物解离速度较慢有关。 The exchange kinetics of Sm ~ (3+) in EDTA-NH_4Ac (pH = 3.0) solution and five kinds of macroporous ion exchange resins with the same degree of cross-linking but different pore structure were studied. The results show that the exchanging kinetics of UO_2 ~ (2 +) - H ~ + with the pore structure of resin The interdependencies also apply to the present system, ie the appropriate pore size range is associated with the higher intrinsic diffusion constant and the higher specific surface area increases the film diffusion constant. The difference with the mass transfer of UO 2 2+ is that the high specific surface area can not reduce the time elapsed by the liquid film diffusion rate, which may be related to the slow dissociation rate of the Sm-EDTA complex.