Modeling of the Interaction of Pu(VI) with the Mixture of Microorganism and Clay

概要

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A model analysis of the transformation of Pu(VI) in a mixture of a common soil bacterium, Bacillus subtilis, and kaolinite clay was carried out. A simplified kinetic model, where the adsorptions of Pu(VI) and Pu(V) are assumed to be in instantaneous equilibrium and the two-step reduction of Pu(VI) to Pu(V) and then to Pu(IV) is described by a first-order rate law, was proposed. When we assumed in the model analysis that the reduction rate of Pu(V) to Pu(IV) was higher for B. subtilis than for kaolinite, the estimated fractions of Pu in the solution and in the mixture, and the oxidation states of Pu in the solution and in the mixture were in good agreement with the measured ones. On the contrary, the assumption that the reduction rate of Pu(V) to Pu(IV) for kaolinite was the same as that for B. subtilis gave a wrong prediction of Pu association with the mixture. These results strongly suggest that Pu(V) on the bacterial cell is reduced to Pu(IV) by the bacterially mediated electron transfer process during the accumulation of Pu(VI) in the mixture.
社団法人日本原子力学会の論文
2009-01-01