花岗岩介质中Sr、I和Pu的扩散行为

Diffusivity of Sr, I and Pu in Granite With Through-Diffusion Experiment

摘要: 采用穿透扩散法研究了Sr、I和Pu等3种元素在花岗岩中的扩散行为，获得了26℃下离子强度为0.1mol/L的中性水溶液环境中Sr、I和Pu的有效扩散系数分别为(1.24±0.03)×10^-13、(2.88±0.02)×10^-13、(1.33±0.52)×10^-13m²/s。研究表明，水溶液与花岗岩平衡过程中核素的存在形态与化学种态的变化对其迁移行为有明显影响。

Abstract: The diffusion behavior of Sr, I and Pu in granite was investigated by through-diffusion experiment. The effective diffusion coefficients of Sr, I and Pu in granite at 26℃ were determined to be (1.24±0.03)×10^-13m²/s, (2.88±0.02)×10^-13m²/s and (1.33±0.52)×10^-13m²/s, respectively. It is also observed that the speciation and species distribution of element have significant effects on its diffusion behavior.