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采用浸泡吸附方法,研究了低酸度环境下痕量镅在玻璃表面上吸附的各种影响因素。结果表明,溶液介质条件对吸附的影响非常显著:降低溶液温度和pH值、增大离子强度、选择离子价态高的电解质和络合能力强的络合剂均能有效减少镅的吸附。在模拟的放化分离镅流程的某个水相体系中,即便玻璃的表面积增大到50.25m2,玻璃表面上也没有镅的吸附损失。采用Lagergren一级动力学方程和BAM理论的液膜扩散方程描述了Am(Ⅲ)在玻璃-水溶液界面上的吸附过程。研究结果可以为有效地减少或避免放射性物质在容器壁上的吸附损失,以及预示其他三价镧锕元素的吸附性质,提供实验方法和依据。
Adsorption method was used to study the various factors that affect the adsorption of trace 镅 on the glass surface under low acidity. The results show that the medium conditions of solution have significant effects on the adsorption: reducing the temperature and pH value of the solution, increasing the ionic strength, selecting the electrolytes with high valence states and complexing agents with strong complexing ability can effectively reduce the adsorption. In a simulated aqueous phase separation system, even if the surface area of the glass is increased to 50.25 m 2, there is also no adsorption loss on the glass surface. The adsorption kinetics of Am (Ⅲ) at the glass-water interface was described using the Lagergren first-order kinetic equation and the BAM-based liquid-membrane diffusion equation. The results can provide experimental methods and basis for effectively reducing or avoiding the adsorption loss of radioactive substances on the container wall and predicting the adsorption properties of other trivalent lanthanide actinides.