TY - JOUR
T1 - Migration behavior of selenium in the presence of iron in Bentonite
AU - Idemitsu, Kazuya
AU - Kozaki, Hikaru
AU - Akiyama, Daisuke
AU - Kishimoto, Masanao
AU - Yuhara, Masaru
AU - Maeda, Noriyuki
AU - Inagaki, Yaohiro
AU - Arima, Tatsumi
N1 - Publisher Copyright:
Copyright © 2014 Materials Research Society .
PY - 2014/11/6
Y1 - 2014/11/6
N2 - Selenium (Se) is an important element for assessing the safety of high-level waste disposal. Se is redox-sensitive, and its oxidation state varies from -2 to 6 depending on the redox conditions and pH of the solution. Large quantities of ferrous ions formed in bentonite due to corrosion of carbon steel overpack after the closure of a repository are expected to maintain a reducing environment near the repository. Therefore, the migration behavior of Se in the presence of Fe in bentonite was investigated by electrochemical experiments. Na2SeO3 solution was used as tracer solution. Dry density range of bentonite was from 0.8 to 1.4 ×103 kg/m3. Results indicated that Se was strongly retained by the processes such as precipitation reaction with ferrous ions in bentonite. Se K-edge X-ray absorption near-edge structure (XANES) measurements were performed at the BL-11 beamline at SAGA Light Source, and the results revealed that the oxidation state of Se in the bentonite remained Se(IV).
AB - Selenium (Se) is an important element for assessing the safety of high-level waste disposal. Se is redox-sensitive, and its oxidation state varies from -2 to 6 depending on the redox conditions and pH of the solution. Large quantities of ferrous ions formed in bentonite due to corrosion of carbon steel overpack after the closure of a repository are expected to maintain a reducing environment near the repository. Therefore, the migration behavior of Se in the presence of Fe in bentonite was investigated by electrochemical experiments. Na2SeO3 solution was used as tracer solution. Dry density range of bentonite was from 0.8 to 1.4 ×103 kg/m3. Results indicated that Se was strongly retained by the processes such as precipitation reaction with ferrous ions in bentonite. Se K-edge X-ray absorption near-edge structure (XANES) measurements were performed at the BL-11 beamline at SAGA Light Source, and the results revealed that the oxidation state of Se in the bentonite remained Se(IV).
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U2 - 10.1557/opl.2014.641
DO - 10.1557/opl.2014.641
M3 - Article
AN - SCOPUS:84908501180
SN - 0022-1120
VL - 1665
SP - 157
EP - 163
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -