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

夏 暁彬; 亀井 玄人 ; 飯島 和毅  ; 柴田 雅博 ; 大貫 敏彦*; 香西 直文*   

Xia, X.; Kamei, Gento; Iijima, Kazuki; Shibata, Masahiro; Onuki, Toshihiko*; Kozai, Naofumi*

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鉄鉱物、特に黄鉄鉱と可交換性鉄及び地下水中の有機物であることが考察された。また、天然地下水の場合、収着したSeの酸化数はほとんどSeの0価であった。堆積岩/海水地下水系において、Seの収着機構は有機物主にSeの酸化還元状態を影響し、還元されたSe(0)が黄鉄鉱中のS(0)と同位体置換することによる強い相互作用と提案された。

Sorption of Se was studied by batch sortion tests by using sedimentary rock samples and corresponding saline groundwater from Horonobe underground research laboratory site under reducing condition. Spectroscopic analyses were performed by XANES after the sorption tests to identify the oxidation states of Se on the sedimenatary rock. The results suggest that the dominant factors affecting the Se sorption are Fe-bearing minerals, especially pyrite, exchangable Fe, and organic matters. The XANES analytical results revealed that most Se on the sedimentary rock was Se(0)in the case of natural saline groundwater, while only some proportions of Se was Se(0)in case of synthetic groundwater, which contains no organic matter. These suggest that the organic matter probably affect the sorption through changing Se oxidation states, and in a natural seimentary rock/salin groundwater system, reduction of selenium to be Se(0) and its incorporation into pyrite could be expected to be an important sorption mechanism.

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