To determine the diffusion and sorption properties of radionuclides in intact crystalline rocks, a new electromigration device was built and tested by running with I⁻ and Se(IV) ions. By introducing a potentiostat to impose a constant voltage over the studied rock sample, the electromigration device can give more stable and accurate experimental results than those from the traditional electromigration devices. In addition, the variation in the pH of the background electrolytes was minimised by adding a small amount of NaHCO₃ as buffers. To interpret the experimental results with more confidence, an advection-dispersion model was also developed in this study, which accounts for the most important mechanisms governing ionic transport in the electromigration experiments. Data analysis of the breakthrough curves by the advection-dispersion model, instead of the traditional ideal plug-flow model, suggest that the effective diffusivities of I⁻ and Se(IV) are (1.15 ± 0.06) × 10⁻¹³ m²/s and (3.50 ± 0.86) × 10⁻¹⁴ m²/s, respectively. The results also show that I⁻ is more mobile than Se(IV) ions when migrating through the same intact rock sample and that their sorption properties are almost identical.

为了测定在完整的结晶岩放射性核素的扩散和吸附性能，新的电迁移设备被制造和测试通过用予运行^-和Se（IV）离子。通过引入恒电位仪在所研究的岩石样品上施加恒定电压，与传统电迁移设备相比，电迁移设备可提供更稳定，准确的实验结果。另外，通过添加少量的NaHCO _3可以使背景电解质的pH值变化最小。作为缓冲区。为了更可靠地解释实验结果，在本研究中还开发了对流扩散模型，该模型解释了电迁移实验中控制离子迁移的最重要机制。由对流-扩散模型的穿透曲线的数据分析，而不是传统的理想活塞流模型的，建议的有效扩散率我^-和Se（IV）为（1.15±0.06）×10 ^-13 米² /秒和（3.50±0.86）×10 ^-14  m ² / s。该结果还表明，我^-比通过相同的完整岩石样品迁移和其吸附性能几乎是相同的，当硒（IV）离子多个移动。