Solubilization of tetravalent actinoids by microbial activities

• Project/Area Number: 18K19048
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: TANAKA Kazuya 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究副主幹 (60377992)
• Co-Investigator(Kenkyū-buntansha): 山路 恵子 筑波大学, 生命環境系, 教授 (00420076)
• Project Period (FY): 2018-06-29 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 微生物 / アクチノイド / 希土類元素 / 四価アクチノイド / シデロフォア

Outline of Final Research Achievements

Solubilization of tetravalent actinoids by microbial activities has not been well investigated in the environment. In this study, sediment and water samples collected at the two sites, Ningyo-toge and Yu-no-taki falls, were analyzed. Analytical results of Ningyo-toge suggested that organic complex of U might be stabilized in water by microbial acticities. At Yu-no-taki falls, Ce(IV) may have been complexed with organic compounds produced by microbial activities.

Academic Significance and Societal Importance of the Research Achievements

これまで微生物活動の影響を念頭においたアクチノイドの環境挙動に関する研究報告はほとんどなく、不明な点が多かった。本研究では、実際に微生物活動の影響を示唆する結果が得られており、関連分野に与える波及効果も含めて学術的意義は大きい。また、原子力発電の結果発生する放射性廃棄物の地層処分においては、アクチノイド等の放射性核種が環境中に漏えいした際の移行評価を必要がある。本研究の成果は、こうした移行評価を行う際の基礎科学的知見となり得るものであり社会的意義も大きい。

Research Products

• [Journal Article] Speciation of cesium in tree tissues and its implication for uptake and translocation of radiocesium in tree bodies (2021)
  • Author(s): Tanaka Kazuya,Kanasashi Tsutomu,Takenaka Chisato,Takahashi Yoshio
  • Journal Title: Science of The Total Environment Volume: 755 Pages: 142598-142598
  • DOI: 10.1016/j.scitotenv.2020.142598
  • Peer Reviewed / Open Access
• [Journal Article] Saccharides-mediated transformation of Ce during the formation of manganese (hydr)oxide. (2020)
  • Author(s): Deng, G., Ma, T., Tanaka, K., Ohnuki, T., Qiu, X. and Yu, Q.
  • Journal Title: Geochim. Cosmochim. Acta Volume: 286 Pages: 143-158
  • DOI: 10.1016/j.gca.2020.07.028
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Application of M_V-edge XANES to determination of U oxidation state in zircon (2019)
  • Author(s): Tanaka, K. and Takahashi, Y.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 53 Issue: 5 Pages: 329-331
  • DOI: 10.2343/geochemj.2.0568
  • NAID: 130007724537
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed
• [Journal Article] Adsorption mechanism of ReO4－ on Ni-Zn layered hydroxide salt and its application to removal of ReO4－ as a surrogate of TcO4－. (2019)
  • Author(s): Tanaka, K., Kozai, N., Yamasaki, Y., Ohnuki, T., Kaplan, D.I. and Grambow, B.
  • Journal Title: Applied Clay Science Volume: 182 Pages: 1-8
  • DOI: 10.1016/j.clay.2019.105282
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Root-endophytic /Chaetomium cupreum/ chemically enhances aluminium tolerance in /Miscanthus sinensis/ via increasing the aluminium detoxicants, chlorogenic acid and oosporein. (2019)
  • Author(s): Haruma T, Yamaji K, Ogawa K, Masuya H, Sekine Y, Kozai N
  • Journal Title: PLoS ONE Volume: 14(2) Issue: 2 Pages: 1-16
  • DOI: 10.1371/journal.pone.0212644
  • NAID: 120007128123
  • Peer Reviewed / Open Access