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Selenium sorption in a sedimentary rock/saline groundwater system and spectroscopic evidence

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夏 暁彬; 亀井 玄人 ; 飯島 和毅  ; 柴田 雅博 

Xia, X.; Kamei, Gento; Iijima, Kazuki; Shibata, Masahiro

地層処分環境を模擬した低酸素雰囲気還元条件下で、幌延産の堆積岩及び地下水を用いて、Seの収着実験を行った。更に、XANESによる堆積岩に収着したSeの酸化数を調べた。これらの結果からSeの収着に影響を及ぼす要因は、堆積岩石中に含まれる黄鉄鉱の酸化により生成した鉄酸化物及び地下水中の有機物であることが考察された。収着したSeの酸化数はほとんどSeの0価であった。

To match the demand of establishment of reliable safety assessment methodology for HLW disposalin Japan, sorption behavior of radionuclides is required to be studied for sedimentary rock. Sorption of Se was conducted by batch sorption tests by using sedimentary rock samples and corresponding saline groundwater from Horonobe URL site under reducing condition, with consideration of site-specific conditions. Spectroscopic analyses were performed by X-ray absorption near-edge structure (XANES) after the sorption tests to identify the oxidation states of Se on the sedimentary rock. The sorption tests performed under various parameters allowed to identify that the dominant factors affecting the Se sorption are iron-bearing minerals or oxides and the oganic matter. The XANES analytical results revealed that most Se was Se(0) in the case of natural groundwater, while only some proportions of Se was Se(0) in the case of synthetic groundwater. These suggested that the organic matter probably affect the sorption through changing Se oxidation states, and in a natural sedimentary /saline groundwater system, reduction of selenium to be Se(0), could be expected to be an important sorption mechanism.

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