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元素置換型黒雲母を用いたCs, Kの土壌植物間移行メカニズムの解明

Mechanism of soil-to-plant transfer of Cs and K using element-substituted biotite

宇野 功一郎*; 中尾 淳*; 奥村 雅彦   ; 小暮 敏博*; 山口 瑛子  ; 武田 晃*; 丸山 隼人*; 信濃 卓郎*; 矢内 純太*

Uno, Koichiro*; Nakao, Atsushi*; Okumura, Masahiko; Kogure, Toshihiro*; Yamaguchi, Akiko; Takeda, Hikaru*; Maruyama, Hayato*; Shinano, Takuro*; Yanai, Junta*

黒雲母は層間での放射性セシウム(RCs)の選択的吸着(Cs吸着能)と層間からのカリウム(K)供給(K供給能)の2つの機能により土壌から植物へのRCs移行を抑制するが、両者を区別して議論することは難しかった。本研究では、層間Kをルビジウム(Rb)に置換しK供給力を欠損させた風化黒雲母を作製することで両者の機能が様々に異なる黒雲母を作成することに成功した。これらの黒雲母を系統的に比較することで、Cs吸着能及びK供給能が、植物へのRCs移行に及ぼす影響を明らかにした。

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.

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