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Adsorption of neptunium by iron reducing bacterium

鉄還元菌へのNpの吸着

大貫 敏彦; 岩井 和加里*; 香西 直文   ; 田中 万也*  ; 鈴木 庸平*

Onuki, Toshihiko; Iwai, Wakari*; Kozai, Naofumi; Tanaka, Kazuya*; Suzuki, Yohei*

鉄還元菌へのNpの吸着挙動を実験により調べた。その結果、吸着は2時間で平衡に達すること、酸素がない条件では炭素源を与えなくてもNp(V)がNp(IV)に還元される可能性があることが明らかになった。

In this study, we have conducted the research on the interaction of Np with Shewanella putrefaciens. The distribution coefficients of Np(V) after 2 h exposure was nearly the same as that after 4 h, indicating the adsorption of Np(V) by S. putrefaciens was attained equilibrium within 2 h. Higher Kd of Np was measured in the inert glove box than in the aerobic condition. These results indicate that Np(V) is adsorbed by the functional groups of S. putrefaciens, and Np(V) is reduced to Np(IV) by S. putrefaciens.

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