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Migration Behavior of Selenium in the Presence of Iron in Bentonite

Published online by Cambridge University Press:  30 June 2014

Kazuya Idemitsu ,
Hikaru Kozaki ,
Daisuke Akiyama ,
Masanao Kishimoto ,
Masaru Yuhara ,
Noriyuki Maeda ,
Yaohiro Inagaki  and
Tatsumi Arima
Kazuya Idemitsu
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Hikaru Kozaki
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Daisuke Akiyama
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Masanao Kishimoto
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Masaru Yuhara
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Noriyuki Maeda
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Yaohiro Inagaki
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
Tatsumi Arima
Affiliation:
Dept. of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, Japan
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Abstract

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).

Keywords

FeSetransportation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 157 - 163
Copyright
Copyright © Materials Research Society 2014 

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