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Fujiwara, Kenso; Iijima, Kazuki; Terashima, Motoki; Tachi, Yukio
no journal, ,
no abstracts in English
Terashima, Motoki; Tachi, Yukio; Sato, Tomofumi; Akagi, Yosuke*; Kawamura, Makoto*; Nakane, Hideji*; Fujiwara, Kenso; Iijima, Kazuki
no journal, ,
no abstracts in English
Tachi, Yukio; Sato, Tomofumi; Terashima, Motoki; Takeda, Chizuko*; Fujiwara, Kenso; Iijima, Kazuki
no journal, ,
To predict the transport behaviors of radiocesium in river systems around the Fukushima Dai-ichi Nuclear Power Plant, the sorption and desorption of Cs on various types of river soils was investigated as functions of Cs concentration and reaction time. The key factors controlling the Cs transport were discussed based on types of clay minerals, organics, sorption kinetics, etc.
Fujiwara, Kenso; Iijima, Kazuki; Tachi, Yukio; Terashima, Motoki
no journal, ,
In the estuary, clay and/or soil particle with Cs is contacted by brackish water, and it is thought that Cs is desorbed from soil particle and clay particles are aggregated. In the case of last examination [1], I examined desorption and aggregation by using river soil and seawater, and measured the equilibrium data. In this study, kinetics data were measured.
Fujiwara, Kenso; Iijima, Kazuki; Terashima, Motoki; Tachi, Yukio
no journal, ,
Due to the accident of the Fukushima Dai-ichi Nuclear Power Plant, radioactive cesium (Cs) was released in a wide range of areas in and around the Fukushima prefecture. Thus, the chemical condition and mechanism governing transport behavior of Cs should be investigated to predict the behavior of Cs in the natural system. In the brackish water region near the river mouth where a cognate ion (Na, K) concentration increases due to the mixture of seawater, two dynamic evolutions influencing Cs behavior are expected. Firstly, the soil has an ion exchange sites, Cs adsorbed onto ion exchange sites of soil particles is likely to be desorbed. Secondly, decreasing of electrostatic repulsion among clay particles causes aggregation of particles leading to deposition with Cs. In this report, Cs desorption and aggregation of particles such as clays was examined using the seawater of the estuary in the coast and the sediments of the riverbed.