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Microbial transformations of plutonium

微生物によるPuの化学状態変化

Francis, A. J.; Dodge, C. J.*; 大貫 敏彦

Francis, A. J.; Dodge, C. J.*; Onuki, Toshihiko

Pu(IV)のクエン酸錯体の${it P. fluorescens}$による分解挙動及びPu(VI)の${it B. subtilis}$と粘土との混合物への吸着挙動を実験により調べた。その結果、クエン酸は速やかに分解され、Pu(IV)はポリマーとして沈殿すること、及びPu(VI)は${it B. subtilis}$に偏在することを明らかにした。

We investigated the biotransformation of Pu(IV)-citrate by ${it Pseudomonas fluorescens}$ under aerobic conditions. Citric acid was rapidly metabolized by ${it P. fluorescens}$ resulting in the formation of Pu polymer. Addition of Pu(VI) to a mixture consisting of bacterial cells and kaolinite clay showed that the Pu was preferentially associated with bacterial cells as Pu(IV) and that Pu(VI) was reduced to Pu(V) and Pu(IV) only in the presence of bacteria.

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