Effects of soil organic matter decomposition on cesium-137 bioavailability in soils.

• Project/Area Number: 25870049
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis; Risk sciences of radiation and chemicals
• Research Institution: Tohoku University
• Principal Investigator: Arai Hirotsugu 東北大学, 工学(系)研究科(研究院), 助教 (20642078)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 放射性セシウム / 土壌有機物 / 分解・無機化

Outline of Final Research Achievements

This study aimed to elucidate the effects of soil organic matter decomposition on the changes of the amount of bioavailable cesium-137 in soils. The radioactively contaminated soils were incubated in the laboratory to enhance the decomposition. Sequential extraction procedure was applied to those soils for fractionating cesium-137 with different bioavailability. A significant reduction of cesium-137 binding soil organic matter was observed at the first 30 day incubation. On the other hand, water extractable cesium-137 was increased during the same period. In addition, this gain in water extractable cesium-137 might be regulated by the quality of soil organic matter.
Based on the results, it is concluded that the decomposition of soil organic matter changed the cesium-137 bioavailability in the soil. Furthermore, it is suggested that the decomposability of soil organic matter should be taken into the consideration for the future cesium-137 dynamics between soil and plants.

Research Products

• [Journal Article] Application of micron X-ray CT based on micro-PIXE to investigate the distribution of Cs in silt particles for environmental remediation in Fukushima Prefecture (2016)
  • Author(s): K. Ishii, T. Hatakeyama, S. Itoh, D. Sata, T. Ohnuma, T. Yamaguchi, H. Arai, H. Arai, S. Matsuyama, A. Terakawa, S. Kim
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 371 Pages: 387-391
  • DOI: 10.1016/j.nimb.2015.09.054
  • Peer Reviewed
• [Journal Article] The Determination of Soil-plant Transfer Coefficients of Cesium-137 and other elements by g-Ray Measurement and PIXE Analysis, for use in the Remediation of Fukushima (2015)
  • Author(s): K.Ishii, A. Fujita, S. Toyama, A.Terakawa, S.Matsuyama, H.Arai, N.Osada, S. Takyu, T.Matsuyama, S. Koshio, K. Watanabe, S. Ito, K.Kasahara
  • Journal Title: Physics Procedia Volume: 66 Pages: 278-286
  • DOI: 10.1016/j.phpro.2015.05.035
  • Peer Reviewed
• [Journal Article] Evaluating radiocesium retention ablility of root-mat horizon using micro–PIXE analysis (2015)
  • Author(s): . H. Arai, K. Ishii, S. Matsuyama, F. Fujishiro, A. Ishizaki, N. Osada, H. Ssugai, S. Koshio, K. Kusano, Y. Nozawa, S. Yamauchi, M. Karahashi, S. Oshikawa, K. Kikuchi, K. Watanabe, Y. Suzuki, Y. Kikuchi, A. Terakawa.
  • Journal Title: International Journal of PIXE Volume: 24 Issue: 01n02 Pages: 29-34
  • DOI: 10.1142/s012908351450003x
  • Peer Reviewed
• [Journal Article] Micro-PIXE analysis of the distribution of cesium in clay particles for environmental remediation of Fukushima (2015)
  • Author(s): K. Ishii, S. Itoh, D. Sata, S. Matsuyama, A. Terakawa, S. Kim, H. Arai, N. Osada, T. Satoh, M. Koka, A. Kitamura, T. Kamiya.
  • Journal Title: International Journal of PIXE Volume: 24 Issue: 03n04 Pages: 131-136
  • DOI: 10.1142/s0129083514400063
  • Peer Reviewed
• [Journal Article] 居住制限区域で原木栽培したシイタケLentinula edodesの子実体及び胞子紋のオートラジオグラフ (2015)
  • Author(s): 山口敏朗, 石井慶造, 荒井宏, 大沼透, 松山成男, 寺川貴樹, 新井宏受
  • Journal Title: 日本きのこ学会誌 Volume: 23 Pages: 125-129
  • Peer Reviewed
• [Journal Article] Application of PIXE analysis to investigation of plants cultivated with contaminated soil of Fukushima (2014)
  • Author(s): K. Ishii, A. Terakawa, S. Matsuyama, A. Ishizaki, H. Arai, N. Osada, H. Sugai, H. Takahashi, K. Sera, H. Sasaki, T. Sawamura
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 332 Pages: 46-49
  • DOI: 10.1016/j.nimb.2014.02.027
  • Peer Reviewed
• [Journal Article] Remediation of plants contaminated with cesium by aqueous cleaning (2014)
  • Author(s): N. Osada,., K. Ishii, S. Matsuyama, H. Sugai, K. Kusano, Y. Nozawa, S. Yamauchi, M. Karahashi, S. Oshikawa, K. Kikuchi, S. Koshio, K. Watanabe, S. Itoh, Y. Suzuki, A. Terakawa, Y. Kikuchi, F. Fujishiro, A. Ishizaki, H. Arai
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 318 Pages: 102-104
  • DOI: 10.1016/j.nimb.2013.06.050
  • Peer Reviewed
• [Journal Article] Concentration of Cs in plants and water resulting from radioactive pollution (2014)
  • Author(s): A. Ishizaki, K. Ishii, S. Matsuyama, F. Fujishiro, H. Arai, N. Osada, H. Sugai, S. Koshio, S. Yamauchi, K. Kusano, Y. Nozawa, M. Karahashi, S. Oshikawa, K. Kikuchi, K. Watanabe, S. Itoh, K. Kasahara, S. Toyama, Y. Suzuki
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 318 Pages: 105-108
  • DOI: 10.1016/j.nimb.2013.06.049
  • Peer Reviewed
• [Journal Article] Reducing logistical barriers to radioactive soil remediation after the Fukushima No. 1 nuclear power plant accident (2014)
  • Author(s): K. Ishii, A. Terakawa, S. Matsuyama, Y. Kikuchi, F. Fujishiro, A. Ishizaki, N. Osada, H. Arai, H. Sugai, H. Takahashi, K. Nagakubo, T. Sakurada, H. Yamazaki, S. Kim
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 318 Pages: 70-75
  • DOI: 10.1016/j.nimb.2013.06.067
  • Peer Reviewed
• [Journal Article] PIXE analyses of cesium in rice grains (2014)
  • Author(s): Hiroyuki Sugai, Keizo Ishii, Shigeo Matsuyama, Atsuki Terakawa, Yohei Kikuchi, Hiroaki Takahashi, Azusa Ishizaki, Fumito Fujishiro, Hirotsugu Arai, Naoyuki Osada, Masahiro Karahashi, Yuichiro Nozawa, Shosei Yamauchi, Kosuke Kikuchi, Shigeki Koshio, Koji Watanabe
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 318 Pages: 191-193
  • DOI: 10.1016/j.nimb.2013.06.060
  • Peer Reviewed
• [Presentation] ミクロンＲＩイメージングシステムによる植物中の鉄の動態観察 (2014)
  • Author(s): 丸山隆史、石井慶造、松山成男、寺川貴樹、佐藤由良、新井宏受、山口敏弘、大沼透、長久保和義、櫻田喬男
  • Organizer: 第３０回PIXEシンポジウム
  • Place of Presentation: 岩手医科大学、岩手
  • Year and Date: 2014-10-22
• [Presentation] 土壌有機物動態が放射性セシウムの可給性の変化に与える影響の 評価 (2014)
  • Author(s): 新井宏受、長田直之、石井慶造
  • Organizer: 日本原子力学会
  • Place of Presentation: 京都大学、京都
  • Year and Date: 2014-09-08 – 2014-09-10
• [Presentation] 竹林生態系における放射性セシウムの分布状況 (2014)
  • Author(s): 新井宏受，石井慶造，長久保和義，高橋宏明，石﨑梓，長田直之，菅井裕之
  • Organizer: 日本原子力学会
  • Place of Presentation: 八戸工業大学、青森
• [Presentation] セシウムが付着した植物の水洗浄による除染 (2014)
  • Author(s): 長田直之、松山成男、新井宏受、高橋宏明、石崎梓、櫻田喬雄、菅井裕之、石井慶造
  • Organizer: 日本原子力学会
  • Place of Presentation: 八戸工業大学、青森
• [Presentation] 福島第一原子力発電所事故に伴う放射性物質汚染土壌の減容化手法；（1）汚染土壌から分離した放射性セシウム吸着粘土の特性評価 (2014)
  • Author(s): 高橋宏明，石﨑梓，長田直之，新井宏受，菅井裕之，松山成男，石井慶造
  • Organizer: 日本原子力学会
  • Place of Presentation: 八戸工業大学、青森
• [Presentation] 宮城県丸森町における野菜の放射能濃度 (2014)
  • Author(s): 長久保和義，石井慶造，寺川貴樹，松山成男，石﨑梓，長田直之，新井宏受，高橋宏明，桜田喬雄
  • Organizer: 日本原子力学会
  • Place of Presentation: 八戸工業大学、青森