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2014, Vol.43, No.7

1128-1130

Characterization of Particulate Matters in the Pripyat River in Chernobyl Related to Their Adsorption of Radiocesium with Inhibition Effect by Natural Organic Matter

Hiroki Suga 1 , Qiaohui Fan 1 , Yasuo Takeichi 2 , Kazuya Tanaka 3 , Hiroaki Kondo 1 , Vladimir V. Kanivets 4 , Aya Sakaguchi 1 , Kenji Kato 5 , Nobuhito Inami 2 , Kazuhiko Mase 2 , Kanta Ono 2 , Yoshio Takahashi 1 , 2
1 Department of Earth and Planetary Systems Science, Hiroshima University
2 Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)
3 Institute for Sustainable Science and Development, Hiroshima University
4 Ukranian Hydrometeorological Institute
5 Department of Geosciences, Faculty of Science, Shizuoka University
https://doi.org/10.1246/cl.140222

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Abstract
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Although cesium adsorbs onto the interlayer of clay minerals, coexisting natural organic matter (NOM) can inhibit this adsorption because of their blocking effect. A large amount of dissolved organic carbon (DOC) in the Pripyat River (= 18 mg L−1) is responsible for the large dissolved fraction of cesium in the river as suggested by cesium LIII-edge EXAFS. In addition, the carbon K-edge NEXAFS by STXM showed that humic acid coats clay minerals in the Pripyat River, which is responsible for the blocking effect.

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