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Modeling of the interaction of Pu(VI) with the mixture of microorganism and clay

微生物と粘土の混合物とPu(VI)の相互作用のモデル解析

大貫 敏彦; 吉田 崇宏*; 尾崎 卓郎; 香西 直文; 坂本 文徳; 南川 卓也; 鈴木 義規; Francis, A. J.*

Onuki, Toshihiko; Yoshida, Takahiro*; Ozaki, Takuo; Kozai, Naofumi; Sakamoto, Fuminori; Nankawa, Takuya; Suzuki, Yoshinori; Francis, A. J.*

モデル解析により、Pu(VI)の微生物と粘土鉱物との混合物への濃集過程におけるPu(IV)の還元挙動を検討した。モデル解析と実験結果を比較した結果、Pu(VI)は微生物細胞表面で電子を受け取りPu(IV)に還元されると仮定した場合に両者に良い一致が見られた。一方、Pu(V)の不均化反応を仮定した場合にはモデルによる予測は実験結果と異なった。これらの結果から、Pu(VI)のPu(IV)への還元には微生物が関与することがわかった。

Model analysis of the transformation of Pu(VI) in a mixture of a common soil bacterium, Bacillus subtilis, and kaolinite clay was carried out. When we assumed in the model analysis that reduction rate of Pu(V) to Pu(IV) was higher on B. subtilis than on kaolinite, the estimated fractions of Pu in the solution and in the mixture, oxidation states of Pu in the solution and in the mixture were in good agreement with the measured ones. On the contrary, assumption that reduction rate of Pu(V) to Pu(IV) was the same on kaolinite as on ${it B. subtilis}$ gave wrong prediction of Pu association with the mixture. These results strongly suggested the electron transfer from the bacteria to Pu(V) on the bacterial cell to be reduced to Pu(IV) during the accumulation of Pu(VI) to the mixture.

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