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Sorption and diffusion of Eu in sedimentary rock in the presence of humic substance

フミン物質共存下におけるEuの収着,拡散挙動

清田 佳美; 寺島 元基; 舘 幸男; 飯島 和毅; 中澤 俊之*; 山田 憲和*; 油井 三和

Seida, Yoshimi; Terashima, Motoki; Tachi, Yukio; Iijima, Kazuki; Nakazawa, Toshiyuki*; Yamada, Norikazu*; Yui, Mikazu

フミン物質共存下で堆積岩におけるEuの収着,拡散挙動について調べた。拡散挙動はリザーバー減衰拡散試験法により観察した。リザーバーにおける核種濃度の減衰曲線から、フミン物質と核種の間に錯形成などの相互作用が働いているものと推察された。一方、リザーバー内のフミン物質濃度の有意な減少は認められなかった。フミン酸の共存によりEuの岩石に対する収着量が低下する条件があることが明らかとなった。Euの収着,拡散挙動は、フミン酸の影響を受けることが明らかとなった。

Diffusion and sorption behaviors of Eu in sedimentary rock were investigated in the presence of humic substance in the present study. Sedimentary rock obtained from Horonobe URL test site in Hokkaido, Japan, (accessible pore diameter is around several to several ten nanometer) was used. The Diffusion behaviors of Eu were examined based on reservoir depletion method coupled with analysis of inner distribution of the radioactive elements in the rock. Time sequence of concentration of each radioactive element as well as the humic substance in the reservoir was obtained as a function of concentration and molecular size of humic substance. Coexistence of humic substance reduced the depletion of Eu in the reservoir, indicating complexation between the radioactive elements and the humic substance. On the contrary, obvious decrease of humic substance in the reservoir was not observed in the system. This observation suggests that the radioactive elements became hard to diffuse into the sedimentary rock due to an increase of their size through complexation with the humic substance. The sorption of Eu was reduced with increase of the humic substance although the sorption of the humic substance was not influenced by the existence of Th or Eu. The diffusion and sorption of Eu were found to be reduced in the presence of humic substance.

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