Speaker
Prof.
Kazuya Idemitsu
(Kyushu university)
Description
The apparent diffusion coefficients of La, Nd, Eu, Dy, Er and Lu in compacted bentonites were investigated in various bicarbonate concentration. The apparent diffusion coefficients of lanthanides tended to decrease with increase of dry density. In the lower bicarbonate conditions than 0.25 M lanthanum had the largest diffusion coefficient of ca. 10-13 m2/s at 1.0 Mg/m3 and diffusion coefficient was small as atomic number becomes big. On the other hand in the higher bicarbonate conditions than 0.25 M Lutetium had the largest diffusion coefficient and diffusion coefficient was small as atomic number becomes small. Especially Lanthanum and Neodymium had smaller diffusion coefficient than 10-14 m2/s even at 1.0 Mg/m3. Diffusion coefficient of Europium was around 10-13 m2/s at 1.0 Mg/m3 and less influence of bicarbonate concentration. Diffusion coefficient of Lutetium increased from 2 x 10-14 to 10-12 m2/s with bicarbonate concentration up to 1.0 M.
Primary author
Prof.
Kazuya Idemitsu
(Kyushu university)
Co-authors
Mr
Kazuyuki Fuji
(Kyushu university)
Mr
Noriya Okubo
(Kyushu university)
Prof.
Tatsumi Arima
(Kyushu university)
Prof.
Yaohiro Inagaki
(Kyushu university)
Mr
Yuki Kakoi
(Kyushu university)
