Additivity of the distribution ratio of Cs and Se on bentonite/quartz sand mixture in seawater |
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| Authors: | Yi-Lin Jan Shih-Chin Tsai Jiun-Chi Jan Chun-Nan Hsu |
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| Institution: | (1) Department of Nuclear Science, National Tsing Hua University; Department of Civil Engineering, Ching Yun University, Hsinchu 300, Taiwan; Jungli 320, Taiwan;(2) Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung 831, Taiwan;(3) Department of Civil Engineering, Ching Yun University, Jungli 320, Taiwan;(4) Department of Nuclear Science, National Tsing Hua University, Hsinchu 300, Taiwan |
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| Abstract: | Summary To provide comprehensive information for assessing the safety of geological disposal of radioactive waste, the additivity
of sorption properties during different reaction times for various bentonite/quartz sand mixtures was investigated. Se and
Cs were the nuclides of interest. Synthetic seawater (SW) was employed as the liquid phase tosimulate the possible groundwater
conditions while the disposal site is an island area. Batch sorption experiments were conducted to measure the distribution
ratio, Rd. Regardless of whether Cs and Se were used, the additivityat the reaction time of 7 and 14 days was better than that of 28
and 56 days.Interactions between bentonite and quartz sand might occur in synthesized seawater in reactions beyond 14 days.
Under the experimental conditions,the additivity equation could be corrected by the composition ratio and reaction time. Long-term
prediction of the Rdby short term batch sorption experiments would be helpful while assessing buffer materials mixed by bentonite and quartz sand. |
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