Adsorption of neptunium by iron reducing bacterium

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

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.