Interaction of rare earth elements and suspended matters contained in Horonobe deep groundwater

Kirishima, Akira*; Kuno, Atsushi*; Amamiya, Hiroki; Murakami, Hiroaki  ; Amano, Yuki   ; Iwatsuki, Teruki  ; Mizuno, Takashi   ; Kubota, Takumi*; Sasaki, Takayuki*; Sato, Nobuaki*

For understanding of the migration behavior of minor actinides (MA) in groundwater, the interaction of rare earth elements and suspended matters contained in Horonobe deep groundwater was studied. From this chemical analog study, it is suggested that the migration behavior of MA in the Horonobe groundwater system seems to be regulated by the formation of phosphate precipitation and small percentage of MA would be carried in the groundwater as pseudo colloids like MA-humic substance complex.