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Investigating diffusion mechanism for HTO and Se(IV)/Se(VI) in compacted Tamusu clay rock with different column lengths

  • Yuzhen Sun , Zhenxing Liu , Rongjing Tang , Chuan-Pin Lee , Zhifen Wang , Mingbiao Luo EMAIL logo , Rong Hua EMAIL logo , Qifeng Jiang and Xuebin Su
Published/Copyright: September 6, 2022
Radiochimica Acta
From the journal Radiochimica Acta Volume 110 Issue 12

Abstract

Due to continuous self-sealing and good mechanical properties, the Tamusu clay rock of Inner Mongolia has been identified as the pre-selected site for high-level radioactive waste geological disposal site in China. The study of chemical behaviors related to Tamusu clay rock, such as nuclide migration, will be an important content of the performance assessment and safety assessment of the disposal repository in the future. The diffusion behavior of HTO and Se(IV)/Se(VI) with different compacted column lengths in Tamusu clay rock is discussed by the through-diffusion method. The diffusion coefficient, rock capacity factor, effective porosity, and other diffusion parameters closely related to nuclide migration are calculated, and the mechanism of nuclide diffusion is preliminarily discussed. The results show that D a (6.23 × 10−11∼17.96 × 10−11 m2 s−1), D e (1.62 × 10−11∼4.67 × 10−11 m2 s−1) for HTO increase with the increase of the compacted column length, and it is proposed that the diffusion process of HTO is affected by the change of geometrical factor and path tortuosity. D a (7.29 × 10−13∼1.74 × 10−13 m2 s−1), D e (5.15 × 10−12∼2.15 × 10−12 m2 s−1) for Se(IV), D a (3.11 × 10−12∼1.09 × 10−12 m2 s−1), D e (2.53 × 10−12∼1.09 × 10−12 m2 s−1) for Se(VI), which decrease with the increase of the compacted column length, it is mainly due to the existence of anion repulsion effect.

Keywords: high-level radioactive waste; geological disposal; Tamusu clay rock; HTO and Se(IV)/Se(VI); the diffusion coefficient; through-diffusion
Corresponding authors: Mingbiao Luo, State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China, E-mail: ; and Rong Hua, College of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China, E-mail:
Yuzhen Sun and Zhenxing Liu contributed equally to this work.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This research is supported by grants from China National Uranium Co., Ltd.-State Key Laboratory of Nuclear Resources and Environment (East China University of Technology) Joint innovation fund project (2022NRE-LH-15), the Nuclear Energy Development Project (technology for the mining and metallurgy of associated uranium resources – on the demonstration of uranium co-mining in Bayan Ura, Inner Mongolia).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-07-09
Accepted: 2022-08-16
Published Online: 2022-09-06
Published in Print: 2022-12-16

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Original Papers
  3. Experimental cross section of the 164Dy(n,γ)165Dy reaction at the neutron energy of 0.0372 eV using Neutron Diffraction Facility
  4. Is octavalent plutonium really formed during oxidation in alkaline aqueous solutions?
  5. A comparison of the extraction behaviour of tris(2-methylbutyl) phosphate and tri-n-alkyl phosphates for the separation of metal ions for U–Zr and U–Pu–Zr systems by cross-current mode
  6. Investigating diffusion mechanism for HTO and Se(IV)/Se(VI) in compacted Tamusu clay rock with different column lengths
  7. Preparation and radiolabeling of Iranian Androctonus crassicauda scorpion venom with technetium-99m as a new agent for cancer diagnostic and therapeutic purposes
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https://doi.org/10.1515/ract-2022-0070
Keywords for this article
high-level radioactive waste; geological disposal; Tamusu clay rock; HTO and Se(IV)/Se(VI); the diffusion coefficient; through-diffusion

Articles in the same Issue

  1. Frontmatter
  2. Original Papers
  3. Experimental cross section of the 164Dy(n,γ)165Dy reaction at the neutron energy of 0.0372 eV using Neutron Diffraction Facility
  4. Is octavalent plutonium really formed during oxidation in alkaline aqueous solutions?
  5. A comparison of the extraction behaviour of tris(2-methylbutyl) phosphate and tri-n-alkyl phosphates for the separation of metal ions for U–Zr and U–Pu–Zr systems by cross-current mode
  6. Investigating diffusion mechanism for HTO and Se(IV)/Se(VI) in compacted Tamusu clay rock with different column lengths
  7. Preparation and radiolabeling of Iranian Androctonus crassicauda scorpion venom with technetium-99m as a new agent for cancer diagnostic and therapeutic purposes
  8. Fabrication and application of nanosized stannic oxide for sorption of some hazardous metal ions from aqueous solutions
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