Chemical states of fallout radioactive Cs in the soils deposited at Fukushima Daiichi Nuclear Power Plant accident

Kozai, Naofumi; Ohnuki, Toshihiko; Arisaka, Makoto; Watanabe, Masayuki; Sakamoto, Fuminori; Yamasaki, Shinya; Jiang, Mingyu

doi:10.1080/00223131.2012.677131

Cited by 70 publications

(36 citation statements)

References 10 publications

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“…Indeed, several experiments testing the elution characteristics of radioactive Cs in Fukushima natural soils demonstrate that most of the trace amount of Cs cannot be changed into a soluble form. 14) Thus, the roles of the type I and II sites are of great importance for the volume reduction of waste materials left over from decontamination processes. In this paper, we concentrate on the type I and II sites in mica.…”

Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

2013

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Section: Ccse Japan Atomic Energy Agency Kashiwa Chiba 277-8587 Jmentioning

confidence: 99%

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

2013

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“…We analyzed the radioactive Cs levels in three different soils collected in Iitate-mura in Fukushima Prefecture [14]. The results showed that more than 65% of the 137 Cs resided in the soil samples after treatment with a 1 mole L −1 NH 4 Cl solution and a 1 mole L −1 CH 3 COOH solution, indicating that more than 60% of radioactive Cs was tightly associated with the soils.…”

Section: Implications Of Radioactive Cs In the Soil Of Fukushimamentioning

confidence: 99%

“…Cesium at a low concentration is strongly sorbed on micalike minerals of sediments [11][12][13]. Kozai et al have examined the Cs fallout on soils collected in Fukushima, Japan, and they found that not only mica-like minerals, but also minerals other than mica-like minerals (nonmica minerals) probably fixed the deposited radioactive Cs in the soil [14].…”

Section: Introductionmentioning

confidence: 99%

Adsorption behavior of radioactive cesium by non-mica minerals

Ohnuki

Kozai

2013

Journal of Nuclear Science and Technology

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We studied the adsorption behavior of radioactive cesium (Cs) by the non-mica minerals kaolinite, halloysite, chlorite, montmorillonite, mordenite, MnO 2 , TiO 2 , Al 2 O 3 , and FeOOH to elucidate the environmental behavior of radioactive Cs fallout from the Fukushima Daiichi Nuclear Power Plant in the Tohoku region of Japan. The adsorption and desorption experiments of Cs on the minerals were carried out at the Cs concentrations 1 × 10 −4 , 1 × 10 −5 , and 2 × 10 −9 mole L −1 at pH 5.5. The desorption of Cs from the minerals was examined using 0.1 mole L −1 LiCl, NaCl, KCl, RbCl, and CsCl solutions. The sequential desorption was examined using a 0.1 mole L −1 LiCl solution, a 1 mole L −1 KCl solution, and a 1 mole L −1 HCl solution. The distribution coefficient (K d ) for the minerals at the Cs concentration 10 −9 mole L −1 was in the order of mordenite > illite > montmorillonite, sericite, MnO 2 , kaolinite, and halloysite > chlorite, TiO 2 , Al 2 O 3 , and FeOOH, differing from the order observed at higher Cs concentrations. After the sequential desorption by the three reagent solutions, the residual fraction of Cs was higher at the Cs concentration 10 −9 mole L −1 than at higher concentrations. Approximately 40%, 40%, 50%, and 25% of the adsorbed Cs were residual in montmorillonite, mordenite, MnO 2 , and kaolinite, respectively, after the sequential desorption. These results strongly suggest that (1) radioactive Cs at 10 −9 mole L −1 is more strongly associated with the non-mica minerals than at higher concentrations of 1 × 10 −4 and 1 × 10 −5 mole L −1 , and (2) the non-mica minerals montmorillonite, mordenite, kaolinite, and MnO 2 contributed to the fixation of the radioactive Cs fallout on Fukushima soil.

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“…The radioactive Cs was deposited throughout an area to the northwest of FDNPP [First airborne monitoring by Ministry of Education, Culture, Sports, Science and Technology (MEXT) and U.S. Department of Energy (DOE), 2011; Yoshida and Takahashi, 2012]. Many reports have documented characteristics of the deposited radioactive Cs in soils and river sediments (Ito et al 2012;Kozai et al, 2012;Matsunaga et al, 2013;Qin et al, 2012;Tanaka et al, 2012). Ito et al (2012) examined the distribution of radioactive Cs in some types of soils obtained in Iitate -mura, that is located in northwest from FDNPP and which was affected severely by the FD-NPP accident.…”

Section: Introductionmentioning

confidence: 99%

Distribution and mineralogy of radioactive Cs in reservoir sediment contaminated by the Fukushima nuclear accident

Aoi

Fukushi

Itono

et al. 2013

Journal of Mineralogical and Petrological Sciences

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This study investigated the distribution and mineralogy of radioactive Cs in a core sample from reservoir sediment affected by the Fukushima Daiichi Nuclear Power Plant accident. The sample was obtained 19 months after the accident from a reservoir in Iitate -mura, Fukushima Prefecture. The vertical concentrations of radioactive Cs in the sediment core varied little from the surface to 9 cm depth: 20 -30 Bq/g for 137 Cs. The concentration decreased abruptly at depths greater than 9 cm. The radioactive Cs concentrations were particle -size dependent: finer particles exhibited higher concentrations of radioactive Cs. X -ray diffraction analyses of the size -fractionated sample revealed that the contribution of clay minerals (14 Å minerals, kaolin mineral and mica) increased concomitantly with the decrease of particle size, implying a close relation between radioactive Cs concentration and clay mineralogical compositions. Periodical airborne monitoring showed that the 137 Cs inventory in the reservoir catchment area decreased significantly with time after the accident. Results of a 137Cs inventory in the reservoir sediment were almost identical to those for the catchment area immediately after the accident, but were significantly higher than those in the core sampling period. Results might indicate that the reservoir sediments serve as a sink for radioactive Cs.

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Chemical states of fallout radioactive Cs in the soils deposited at Fukushima Daiichi Nuclear Power Plant accident

Cited by 70 publications

References 10 publications

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

Mechanism of Strong Affinity of Clay Minerals to Radioactive Cesium: First-Principles Calculation Study for Adsorption of Cesium at Frayed Edge Sites in Muscovite

Adsorption behavior of radioactive cesium by non-mica minerals

Distribution and mineralogy of radioactive Cs in reservoir sediment contaminated by the Fukushima nuclear accident

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