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release by increased moisture fluctuation; Volcanic ash soils and non-volcanic ash soilsNagano, Hirohiko*; Suzuki, Yuri*; Hiradate, Shuntaro*; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
no abstracts in English
NYamakita, Eri*; Xinping, D.*; Wijesinghe, J. N.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Ishizuka, Shigehiro*; Senda, Ryoko*; Mori, Yuki*; Hiradate, Shuntaro*
no journal, ,
no abstracts in English
Yamaguchi, Akiko; Takahashi, Yoshio*; Okumura, Masahiko
no journal, ,
Clay minerals control the environmental behavior of various elements because they exist widely in the surface of the Earth and adsorb many cations. Since the adsorption strength of clay minerals varies depending on the adsorption structure at the molecular level, it is important to systematically understand what determines the adsorption structure at the molecular level. In this study, we systematically compared many cations using extended X-ray absorption fine structure (EXAFS) measurements and first principles simulations. The results showed that not only the hydration enthalpy, which has been considered important in the conventional understanding, but also the size of the adsorbed ions is important.
Uno, Koichiro*; Nakao, Atsushi*; Okumura, Masahiko; Kogure, Toshihiro*; Yamaguchi, Akiko; Takeda, Hikaru*; Maruyama, Hayato*; Shinano, Takuro*; Yanai, Junta*
no journal, ,
Biotite inhibits radiocesium (RCs) transfer from soil to plants by two functions of selective adsorption of radiocesium (Cs) between layers (Cs adsorption ability) and K supply from between layers (K supply ability). However, it was difficult to distinguish between the two. In this study, the authors succeeded in preparing biotite in which both functions are variously different by preparing weathered biotite in which interlayer pottasium (K) was replaced with rubidium (Rb) to lose K supply ability. By systematically comparing these biotites, the authors clarified the effects of Cs adsorption ability and K supply ability on Cs transfer to plants.