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Adsorption mechanisms and models of $$^{85}$$Sr, $$^{237}$$Np, $$^{238}$$Pu and $$^{241}$$Am in loess media (Joint research)

$$^{85}$$Sr,$$^{237}$$Np,$$^{238}$$Pu及び$$^{241}$$Amの黄土への吸着メカニズムと吸着モデル(共同研究)

田中 忠夫 ; 向井 雅之 ; 前田 敏克; 松本 潤子 ; 小川 弘道; Li, S.*; Wang, Z.*; Wang, J.*; Guo, Z.*; Zhao, Y.*

Tanaka, Tadao; Mukai, Masayuki; Maeda, Toshikatsu; Matsumoto, Junko; Ogawa, Hiromichi; Li, S.*; Wang, Z.*; Wang, J.*; Guo, Z.*; Zhao, Y.*

$$^{85}$$Sr(II),$$^{237}$$Np(V),$$^{238}$$Pu(IV)及び $$^{241}$$Am(III)の黄土への吸着メカニズムと吸着モデルを吸着脱離実験結果に基づき検討した。$$^{85}$$Sr及び$$^{237}$$Npの分配係数は$$^{238}$$Pu及び$$^{241}$$Amより2$$sim$$3桁小さい値であった。分配係数が小さな$$^{85}$$Sr及び$$^{237}$$Npの黄土への吸着は、主にイオン交換によって支配されていた。一方、黄土に吸着した大部分の$$^{238}$$Pu及び$$^{241}$$Amは、鉄やマンガンの水酸化物・酸化物や腐植物質との選択的な化学結合によって支配されていた。得られた吸着脱離実験結果に基づき、黄土中における放射性核種の移行を解析する手法を確立するため、吸着の可逆性,反応速度等を考慮した吸着モデルを提案した。

Adsorption mechanisms and models of $$^{85}$$Sr(II), $$^{237}$$Np(V), $$^{238}$$Pu(IV) and $$^{241}$$Am(III) on the loess were investigated from their adsorption and desorption properties. The distribution coefficient of $$^{85}$$Sr and $$^{237}$$Np was 2 - 3 orders of magnitude smaller than that of $$^{238}$$Pu and $$^{241}$$Am. The adsorption of $$^{85}$$Sr and $$^{237}$$Np was mainly controlled by the ion exchange reaction. On the other hand, the adsorption of $$^{238}$$Pu and $$^{241}$$Am was mostly controlled by the selective chemical reactions with Fe and Mn oxyhydroxide/oxide and humic substances. On the basis of the experimental results, several types of adsorption models of the radionuclides, considering elemental concentrations, adsorption mechanisms and kinetics, were proposed for setting up the analytical systems of radionuclide migration in the loess media.

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