Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

Qin, Haibo; Yokoyama, Yuka; Fan, Qiaohui; Iwatani, Hokuto; Tanaka, Kohei; Sakaguchi, Aya; Kanai, Yutaka; Zhu, Jiang; Onda, Yuichi; Takahashi, Yoshio

doi:10.2343/geochemj.2.0214

Cited by 124 publications

(61 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No significant or systematic difference of the XRD patterns from the top to 30 cm depth, which indicates that the reservoir sediment is mineralogically homogeneous, at least up to 30 cm depth. Cs corrected at March 2011 based on these half -lives was calculated as 0.96 ± 0.02, which was similar to those reported for the other samples affected by the FDNPP accident (Kato et al, 2012;Qin et al, 2012), confirming that the radioactive Cs in the sediment derived from the accident.…”

Section: Resultssupporting

confidence: 74%

“…They also reported that the radioactive Cs was distributed mainly in the fine fraction (<75 μm) in soils. Similar characteristics of the radioactive Cs in the soils were observed in soil samples obtained in other regions (Kato et al, 2012;Matsunaga et al, 2013;Qin et al, 2012;Tanaka et al, 2012).…”

Section: Introductionsupporting

confidence: 61%

“…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%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 74%

Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…134 Cs was detected in almost all samples, whereas before the FNPP1 accident, 134 Cs concentration was zero worldwide (e.g., Aoyama and Hirose, 2004). In addition, in all samples the activity ratio of 134 Cs to 137 Cs ( 134 Cs/ 137 Cs) was about one, which was the ratio in the radionuclides released by the FNPP1 accident, as verified by radiocesium analysis of seawater (Buesseler et al, 2011(Buesseler et al, , 2012, aerosols (Haba et al, 2012) and soil (Qin et al, 2012). Thus, there is no doubt that the radiocesium detected in the sinking particles was derived from the FNPP1 accident.…”

Section: Concentrations and Flux Of Radiocesiummentioning

confidence: 87%

“…The Chernobyl fallout was rapidly (within days) solubilized in seawater (Whitehead et al, 1988). However, a part of the cesium can be adsorbed onto or incorporated into aluminosilicates (clay minerals), similar to potassium (Qin et al, 2012, and references therein), and the adsorption or incorporation of cesium is not easily reversed (e.g., Kogure et al, 2012;Otosaka and Kobayashi, 2012). To determine the form of the radiocesium associated with sinking particles, we computed correlations between the concentration and flux of radiocesium with those of organic carbon, biogenic opal, CaCO 3 , lithogenic materials (LM) and trace elements.…”

Section: Form Of the Radiocesium Associated With Sinking Particlesmentioning

confidence: 99%

Concentration and vertical flux of Fukushima-derived radiocesium in sinking particles from two sites in the Northwestern Pacific Ocean

et al. 2013

View full text Add to dashboard Cite

At two stations in the western North Pacific, K2 in the subarctic gyre and S1 in the subtropical gyre, time-series sediment traps were collecting sinking particles when the Fukushima Daiichi Nuclear Power Plant (FNPP1) accident occurred on 11 March 2011. Radiocesium (¹³⁴Cs and ¹³⁷Cs) derived from the FNPP1 accident was detected in sinking particles collected at 500 m in late March 2011 and at 4810 m in early April 2011 at both stations. The sinking velocity of ¹³⁴Cs and ¹³⁷Cs was estimated to be 22 to 71 m day⁻¹ between the surface and 500 m and >180 m day⁻¹ between 500 m and 4810 m. ¹³⁷Cs concentrations varied from 0.14 to 0.25 Bq g⁻¹ dry weight. These values are higher than those of surface seawater, suspended particles, and zooplankton collected in April 2011. Although the radiocesium may have been adsorbed onto or incorporated into clay minerals, correlations between ¹³⁴Cs and lithogenic material were not always significant; therefore, the form of the cesium associated with the sinking particles is still an open question. The total ¹³⁷Cs inventory by late June at K2 and by late July at S1 was 0.5 to 1.7 Bq m⁻² at both depths. Compared with ¹³⁷Cs input from both stations by April 2011, estimated from the surface ¹³⁷Cs concentration and mixed-layer depth and by assuming that the observed ¹³⁷Cs flux was constant throughout the year, the estimated removal rate of ¹³⁷Cs from the upper layer (residence time in the upper layer) was 0.3 to 1.5% yr⁻¹ (68 to 312 yr). The estimated removal rates and residence times are comparable to previously reported values after the Chernobyl accident (removal rate: 0.2–1%, residence time: 130–390 yr)

show abstract

Sinking velocity of particulate radiocesium in the northwestern North Pacific

Honda

Kawakami

2014

Geophys. Res. Lett.

View full text Add to dashboard Cite

Sinking particles (SP) were collected by time series sediment traps at two depths in the northwestern Pacific before and after the Fukushima Daiichi Nuclear Power Plant accident, and accident-derived particulate radiocesium was measured. Radiocesium ( Cs concentration in total SP with that in SP without organic materials, we suspect that most of the 137 Cs was likely incorporated into aluminosilicates.

show abstract

Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique

Cited by 124 publications

References 33 publications

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

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

Concentration and vertical flux of Fukushima-derived radiocesium in sinking particles from two sites in the Northwestern Pacific Ocean

Sinking velocity of particulate radiocesium in the northwestern North Pacific

Contact Info

Product

Resources

About