合成地下水與海水中硒銫在粉碎花崗岩及泥岩的收附與擴散行為

李傳斌

doi:10.6843/NTHU.2009.00030

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合成地下水與海水中硒銫在粉碎花崗岩及泥岩的收附與擴散行為

Sorption and Diffusion of Selenium and Cesium on Crushed Granite and Mudrock in Synthetic Groundwater and Seawater

李傳斌 , Ph.D　　Advisor：許俊男　　

繁體中文 DOI： 10.6843/NTHU.2009.00030

高放射性廢棄物；深地層處置；硒；銫；花崗岩；泥岩；收附；擴散； high-level radioactive waste ； deep geologic disposal ； selenium ； cesium ； granite ； mudrock ； reducing groundwater and seawater ； glove box ； sorption ； diffusion

Abstract │ Reference (51) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Sorption and diffusion behaviours of selenium (Se) and cesium (Cs) on Taiwan host rock including granite and mudrock under aerobic and anaerobic conditions were
performed in this study. The attention of this study was paid on sorption and diffusion experiments under both conditions as the multi-barrier concept in deep geological
disposal has been considered to be the most feasible way to construct a high-level radioactive waste (HLW) repository, where whole rocks and crushed rocks were taken as natural barriers. The reducing groundwater (GW) or seawater (SW) prepared in glove box were used in batch kinetic tests and column diffusion experiments under both conditions to reflect the extreme situation of highly reducing groundwater or seawater underground 300 m or more that might intrude into HLW repositories and release toxic radioactivity to the environment.
     There is an obvious difference between granite and mudrock in sorption behaviors of Se and Cs under both conditions. Sorption of individual Se and Cs in mudrock is higher than that in granite due to high mineral contents of clay and iron oxides. Moreover, fast equilibrium reaction in sorption of Cs by coexisting Se and Cs tests was similar to individual Cs tests according to experimental results. However, equilibrium reactions in sorption of Se by coexisting Se and Cs under both conditions turned into slower and slower and it didn’t reach even in 90 days under anaerobic conditions.
     The diffusion results showed that higher apparent diffusion coefficients (Da) under anaerobic conditions were observed due to higher temperature in glove box. However, Da of HTO, Cs and Se in GW decreased because of CaCO3 precipitation in column. A higher retardation factor (Rf) value of mudrock in column diffusion experiments is in agreement with the results of batch sorption tests.
According to experimental results of column and batch tests, it showed a difference in anaerobic results of granite in GW. In addition to sorption effects, diffusion of Se and Cs depends on the microporous structure of tested media, such as constrictivity and tortuosity. The results from this study provide a reference for performance assessment of HLW repository and for further studies of natural barriers.

Reference ( 51 ) 〈TOP〉

13. 藍培倫「硒銫在粉碎泥岩的吸附與擴散行為，」國立清華大學原子科學系研究所，碩士論文（2006）。
連結：
14. Alloway, B.I., Heavy Metals In Soils, pp.237-238 (1990).
連結：
16. Beauwens, T., Canniere, P. D., Moors, H., Wang L., Maes, N., 2005. “Studying the migration behaviour of selenate in Boom Clay by electromigration.” Engineering Geology 77, 285–293.
連結：
17. Breen, C, 1997, “In Situ 133Cs and 1H solution-phase NMR, thermoanalytical and x-ray diffraction studies of the adsorption of polyalkyleneglycol on Texas bentonite.” Colloids and Surface, 132, 17
連結：
18. Bruggeman, C., Vancluysen, J., A. Maes., 2002, “New selenium solution speciation method by ion chromatography + gamma counting and its application to FeS2-controlled reducing conditions.” Radiochimica Acta, 90, 629–635.
連結：

Times Cited (1) 〈TOP〉

歐律延(2010)。泥岩對硒、銫在不同化合物及離子強度下吸附飽和量的研究。清華大學核子工程與科學研究所學位論文。2010。1-57。

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