A Study of U(VI) sorption on illite under carbonate-rich environments; Batch experiments, TRLFS and modeling

炭酸イオンが豊富な環境下におけるVI価ウランのイライトへの吸着に関する研究; 収着実験、レーザー分光及び反応モデリング

Mei, H.  ; 青柳 登   ; 斉藤 拓巳*; 香西 直文   ; 舘 幸男  

Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Kozai, Naofumi; Tachi, Yukio

Carbonate ions in groundwater are believed to influence migration behaviors of radionuclides in the geological environment by formation of aqueous carbonate complexes. However, little is known about the possibility of sorption of the radionuclide-carbonate complexes on minerals. We investigate U(VI) sorption on an illite mineral as functions of pH and carbonate concentrations, by combining cryogenic time-resolved laser fluorescence spectroscopy and surface complexation modeling. We will present the macroscopic and microscopic results of the speciation of U(VI) in the presence of carbonate and discuss the modeling of the sorption data, reflecting the speciation data.