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Study on Tritium and Iodine Species Transport through Porous Granite: A Non-Sorption Effect by Anion Exclusion.

Authors :
Shi, Yunfeng
Yang, Song
Chen, Wenjie
Xiong, Weijia
Zhang, Aiming
Yu, Zhixiang
Lian, Bing
Lee, Chuan-Pin
Source :
Toxics; Sep2022, Vol. 10 Issue 9, p540-N.PAG, 14p
Publication Year :
2022

Abstract

The safety of deep geological repositories is important in the disposal of high-level radioactive waste (HLW). In this study, advection–dispersion experiments were designed to build a transport model through a calibration/validation process, and the transport behavior of tritiated water (HTO) and various iodine species (iodide: I<superscript>−</superscript> and iodate: IO<subscript>3</subscript><superscript>−</superscript>) was studied on a dynamic compacted granite column. Breakthrough curves (BTCs) were plotted under various flow rates (1–5 mL/min). BTCs showed that the non-sorption effect by anion exclusion was observed only in I<superscript>−</superscript> transport because the retardation factor (R) of I<superscript>−</superscript> was lower than that of HTO (R = 1). Moreover, equilibrium and nonequilibrium transport models were used and compared to identify the mobile/immobile zones in the compacted granite column. The anion exclusion effect was influenced by the immobile zones in the column. The non-sorption effect by anion exclusion (R < 1) was only observed for I<superscript>−</superscript> at 5.0 ± 0.2 mL/min flow rate, and a relatively higher Coulomb's repulsive force may be caused by the smaller hydration radius of I<superscript>−</superscript>(3.31 Å) than that of IO<subscript>3</subscript><superscript>−</superscript>(3.74 Å). [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23056304
Volume :
10
Issue :
9
Database :
Complementary Index
Journal :
Toxics
Publication Type :
Academic Journal
Accession number :
159350720
Full Text :
https://doi.org/10.3390/toxics10090540