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Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository

In this study, a column experiment was employed to evaluate the nuclide migration behavior in the surrounding rock medium of a near-surface disposal site in China and to investigate the advection–dispersion behavior of tritium (H-3) and plutonium-238 (Pu-238) in highly weathered argillaceous shale....

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Autores principales: Shi, Yunfeng, Yang, Song, Wu, Enhui, Wang, Longjiang, Chen, Wenjie, Xiong, Weijia, Zhang, Yanna, Zhang, Aiming, Lian, Bing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9959887/
https://www.ncbi.nlm.nih.gov/pubmed/36850999
http://dx.doi.org/10.3390/toxics11020124
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author Shi, Yunfeng
Yang, Song
Wu, Enhui
Wang, Longjiang
Chen, Wenjie
Xiong, Weijia
Zhang, Yanna
Zhang, Aiming
Lian, Bing
author_facet Shi, Yunfeng
Yang, Song
Wu, Enhui
Wang, Longjiang
Chen, Wenjie
Xiong, Weijia
Zhang, Yanna
Zhang, Aiming
Lian, Bing
author_sort Shi, Yunfeng
collection PubMed
description In this study, a column experiment was employed to evaluate the nuclide migration behavior in the surrounding rock medium of a near-surface disposal site in China and to investigate the advection–dispersion behavior of tritium (H-3) and plutonium-238 (Pu-238) in highly weathered argillaceous shale. A reasonable numerical model was selected to fit the experimental breakthrough curves (BTCs) and to obtain the relevant migration parameters. The results show the following: (1) the internal structure of the highly weathered argillaceous shale exhibited heterogeneity, and the nuclide migration BTC showed characteristics of a “curve peak moving forward” and a “tail curve trailing”; (2) compared with other models, the stream tube mode could better fit the BTCs and obtain the average dispersion coefficient <D>, average distribution coefficient <K(d)>, and other parameters; (3) compared to the results of the batch experiment, the distribution coefficient K(d) obtained from the column experiment was smaller than that obtained from the batch experiment, which is speculated to be due to the influence of contact time and the contact area between the nuclide and the medium.
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spelling pubmed-99598872023-02-26 Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository Shi, Yunfeng Yang, Song Wu, Enhui Wang, Longjiang Chen, Wenjie Xiong, Weijia Zhang, Yanna Zhang, Aiming Lian, Bing Toxics Article In this study, a column experiment was employed to evaluate the nuclide migration behavior in the surrounding rock medium of a near-surface disposal site in China and to investigate the advection–dispersion behavior of tritium (H-3) and plutonium-238 (Pu-238) in highly weathered argillaceous shale. A reasonable numerical model was selected to fit the experimental breakthrough curves (BTCs) and to obtain the relevant migration parameters. The results show the following: (1) the internal structure of the highly weathered argillaceous shale exhibited heterogeneity, and the nuclide migration BTC showed characteristics of a “curve peak moving forward” and a “tail curve trailing”; (2) compared with other models, the stream tube mode could better fit the BTCs and obtain the average dispersion coefficient <D>, average distribution coefficient <K(d)>, and other parameters; (3) compared to the results of the batch experiment, the distribution coefficient K(d) obtained from the column experiment was smaller than that obtained from the batch experiment, which is speculated to be due to the influence of contact time and the contact area between the nuclide and the medium. MDPI 2023-01-27 /pmc/articles/PMC9959887/ /pubmed/36850999 http://dx.doi.org/10.3390/toxics11020124 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Shi, Yunfeng
Yang, Song
Wu, Enhui
Wang, Longjiang
Chen, Wenjie
Xiong, Weijia
Zhang, Yanna
Zhang, Aiming
Lian, Bing
Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title_full Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title_fullStr Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title_full_unstemmed Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title_short Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository
title_sort advection–dispersion behavior for simulation of h-3 and pu-238 transport in undisturbed argillaceous shale of a near-surface repository
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9959887/
https://www.ncbi.nlm.nih.gov/pubmed/36850999
http://dx.doi.org/10.3390/toxics11020124
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