Identification and characterization of phase governing Eu(III) uptake in granite by microscopic observations

Hasegawa, Yusuke*; Fukushi, Keisuke*; Maeda, Koshi*; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi

no journal, , 

Bio-mineralization of rare earth elements

Onuki, Toshihiko; Jiang, M.*; Utsunomiya, Satoshi*; Tanaka, Kazuya*

no journal, , 

We found that Sm(III) phosphate minerals were formed on the cells surface of gram negative bacterium after exposure of Sm(III) solution with the resting cells. TEM-SAED analysis showed that Sm-monazite was developed directly from the surface of cells. Sm(III) ions were first adsorbed by the functional groups of cells surface, followed by the chemical states change by the reaction with phosphate ions released from inside the yeast cells.

Hydrochemical analyses to evaluate groundwater system in Horonobe Area, Hokkaido, Japan

Sakai, Ryutaro; Munakata, Masahiro; Seguchi, Mariko*; Ooka, Masao*; Ichikawa, Yasuo*; Nakamura, Masaru*; Ishibashi, Junichiro*

no journal, , 

In the safety assessment for a geological disposal of radioactive waste, it is important to establish validation methods for deep groundwater flow system to estimate radionuclide migration to human environment through groundwater flow. This study discussed the method which estimates groundwater mixing condition and groundwater flow process using principal component analysis to groundwater chemistry and isotopic compositions in case of Horonobe area. The results demonstrated that there are three component of deep groundwater which has long residence time and surface water derived from meteoric water in this area.