Abstract
We investigated the sorption of Pu(IV) on biogenic Mn oxide, composed of Mn(IV) oxide and hyphae, produced by Mn(II)-oxidizing fungus. The sorption of Pu(IV) on biogenic Mn oxide was similar to that of U(VI) and different from that of Th(IV), possibly due to oxidation of Pu(IV) to Pu(VI). When Pu(IV) was sorbed on hyphae only, it was desorbed into the solution phase over time. Pu(IV) could be solubilized by complexation with organic ligands secreted by fungal cells. Furthermore, Pu(IV) desorption was observed especially under circumneutral pH conditions, indicating that Pu(IV) can be solubilized by microbial activity in most surface environments.
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This work was supported by a JSPS Grant-in-Aid for Scientific Research (B) Grant Number JP15H04245.
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Conceptualization: Kazuya Tanaka; Methodology: Kazuya Tanaka, Yukinori Tani, Naofumi Kozai; Formal analysis and investigation: Kazuya Tanaka; Writing—original draft preparation: Kazuya Tanaka; Writing—review and editing: Yukinori Tani, Naofumi Kozai, Toshihiko Ohnuki; Funding acquisition: Kazuya Tanaka; Resources: Yukinori Tani, Naofumi Kozai, Toshihiko Ohnuki.
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Tanaka, K., Tani, Y., Kozai, N. et al. Sorption of Pu(IV) on biogenic Mn oxide and complexation of Pu(IV) with organic ligands secreted by fungal cells. J Radioanal Nucl Chem 331, 1109–1114 (2022). https://doi.org/10.1007/s10967-021-08178-w
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DOI: https://doi.org/10.1007/s10967-021-08178-w