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- Title
Evaluation of Ion-Exchange Characteristics of Cesium in Natural Japanese Rocks.
- Authors
Miura, Takuya; Sasaki, Atsushi; Endo, Masatoshi
- Abstract
A large amount of soil was contaminated by radioactive cesium due to the accident at the Fukushima Daiichi Nuclear Power Plant in Japan in 2011. The adsorption behavior of cesium ions (Cs+) is strongly influenced by numerous factors, including the components, structure and weathering conditions of natural soil. The adsorption and ion exchange characteristics of Cs+ ions onto and from natural Japanese rocks with well-known components were studied. Cs+ adsorption onto volcanic rocks (0.9–5.3 mg/g) occurred more easily than that onto plutonic rocks (0.7–0.8 mg/g) due to differences in crystallinity. In addition, the adsorption quantity of cesium increased with increasing lattice water content and content of ion-exchangeable cations in the rock samples. The cesium adsorption ability of rock was inhibited by seawater and coexisting ions in the solution. Cesium adsorption quantities onto andosol, containing the corrosion products, increased approximately 2.7-fold with increasing pH from neutral to basic. Cesium desorption differed depending on the type of salt used, and the desorption rates were highest with ammonium salts. Cs+ desorption from regions such as the soil interlayer and the pores were inhibited by melting of the rock surface.
- Subjects
ION exchange (Chemistry); CESIUM content of soils; SOIL pollution; CESIUM ions; FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011
- Publication
Technologies (2227-7080), 2018, Vol 6, Issue 3, p78
- ISSN
2227-7080
- Publication type
Article
- DOI
10.3390/technologies6030078