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Chemical speciation and association of plutonium with bacteria, kaolinite clay, and their mixture

微生物,カオリナイト及びそれらの混合物へのPuの吸着と化学状態

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.

Pu(VI)の微生物、カオリナイト及びそれらの混合物への吸着をバッチ実験により検討した。Puの吸着量は時間とともに増加した。酸化数を測定した結果、Pu(VI)は微生物へ及び混合物との接触により溶液中ではVに、吸着したPuはIVに還元した。一方、カオリナイトとの接触ではPu(VI)のままであった。試薬溶液による脱離実験及び電子顕微鏡による分析からPuは混合物中の微生物に選択的に吸着したことがわかった。以上の結果から、Pu(VI)が微生物による還元により、混合物中で微生物に選択的に濃集したことを明らかとなった。

We investigated the interactions of Pu(VI) with Bacillus subtilis, kaolinite clay, and a mixture of the two to determine and delineate the role of the microbes in regulating the environmental mobility of Pu. The amount of Pu sorbed by B. subtilis increased with time, but had not reached equilibrium in 48 h, whereas equilibrium was attained in kaolinite within 8 h. After 48 h, the oxidation state of Pu in the solutions exposed to B. subtilis and the mixture had changed to Pu(V), whereas the oxidation state of Pu associated with B. subtilis and the mixture was Pu(IV). In contrast, there was no change in the oxidation state of Pu in the solution or on kaolinite after exposure to Pu(VI). SEM-EDS analysis indicated that most of the Pu in the mixture was associated with B. subtilis. These results suggest that Pu(IV) is preferably sorbed to bacterial cells in the mixture, and that Pu(VI) is reduced to Pu(V) and Pu(IV).

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パーセンタイル:38.21

分野:Engineering, Environmental

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