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生物含量和结构在控制花岩中的扩散中的作用

Yuta Fukatsu¹, Qinhong Hu², Yukio Tachi³

¹Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai, Ibaraki 319-1194, Japan; Horonobe Underground Research Center, Japan Atomic Energy Agency, 432-2 Hokushin, Horonobe, Hokkaido 098-3224, Japan; Department of Earth and Environment Sciences, University of Texas at Arlington, Arlington, TX 76019, USA.

Journal of contaminant hydrology

|December 2, 2025

概括

由生物含量驱动的离子过量扩散控制了晶体岩石中的运输. 这种理解改善了地质放射性废物存储库的放射性核素运输预测.

科学领域:

地质化学地质化学
核废物管理核废物管理
材料科学材料科学材料科学

背景情况:

预测地质存储库中的放射性核素运输对于放射性废物安全评估至关重要.
晶体岩石中的矩阵扩散和吸附是影响这种运输的关键过程.

研究的目的:

研究在花岩 (tonalite,granodiorite,花岩) 中的离子 (Cs+) 扩散和吸收.
确定岩石类型,特别是生物含量对Cs+运输行为的影响.

主要方法:

进行了透射扩散实验,以测量Cs+的有效扩散系数 (D_e) 和分布系数 (K_d).
在各种化 (KCl) 度下分析了Cs+行为.
利用X射线衍射 (XRD) 检查矿物学变化,特别是水生物结构.

主要成果:

有效扩散系数 (D_e) 从10^-12到10^-11 m^2/s,分布系数 (K_d) 从10^-4到10^-2 m^3/kg.
增加的生物含量与较高的Cs+D_e和K_d值相关.
通过在生物的电双层中增加的Cs+积累增强的阳离子过量扩散被确定为一个关键的传输机制.

结论:

生物含量是控制晶体岩石中Cs+矩阵扩散和吸附的关键因素.
阴离子过量扩散机制为不同的花岩类型中Cs+运输提供了一致的解释.
这些发现提高了地质放射性废物存储库安全评估的可靠性.

关键词:

生物石是一种生物石.是一种.扩散扩散是一种扩散.岩石岩石是一种花岩的岩石.激光切除-ICP-MS 进行了激光切除.吸附吸附方式吸附吸附方式通过扩散实验通过扩散实验.XRD XRD 在线观看

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