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A study on the environment of Tokyo-bay sediments under hypoxia analyzed by chemical states of iron and radioactive cesium.

Research Project

Project/Area Number 18K11613
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionThe University of Tokyo

Principal Investigator

Matsuo Motoyuki  東京大学, 大学院総合文化研究科, 教授 (10167645)

Co-Investigator(Kenkyū-buntansha) 小豆川 勝見  東京大学, 大学院総合文化研究科, 助教 (00507923)
杉森 賢司  東邦大学, 医学部, 講師 (30130678)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords貧酸素水塊 / 東京湾底質 / 浚渫窪地 / 非破壊状態分析 / メスバウアー分光法 / 機器中性子放射化分析 / redox sensitiveな元素 / 鉛直分布 / パイライト / メスバウアー / 鉄の化学状態 / 放射性セシウム
Outline of Final Research Achievements

Our purpose is to clarify the history of past hypoxia by chemical analysis of sediments in the vertical direction, assuming that the history of hypoxia is recorded on the bottom sediment. The core sediments were collected from the dredged trench and the natural seabed off Makuhari, Chiba Prefecture, and off Yokohama. State analysis by Moessbauer spectroscopy and analysis of redox sensitive elements by instrumental neutron activation analysis were performed to examine the relationship with the redox state of water quality. As a result, it was clarified that the area off Yokohama is more oxidative than the area off Makuhari, and the dredged trench is the most reducing. Furthermore, observation of secular changes suggested that the anoxic condition in the dredged trench was gradually recovering.

Academic Significance and Societal Importance of the Research Achievements

東京湾の溶存酸素量の分布や貧酸素水塊の実態は、現在はモニタリングポストにより把握されている。しかし、モニタリングポストが存在しなかった過去の海洋環境を、水塊直下の堆積物の化学状態から復元する試みは、他の方法では代え難い非常に重要なアプローチである。すなわち、本研究の成果は貧酸素水塊の発生の原因を解き明かす重要な知見を得る足がかりになり、大きな学術的意義があると考えられる。また、本研究により、貧酸素水塊の発生と浚渫窪地との関連性を解明することができ、社会的意義も大きいものと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (9 results)

All 2020 2019 2018

All Journal Article (4 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] A study on evaluation of redox condition of Tokyo Bay using redox sensitive elements as an indicator by means of instrumental neutron activation analysis.2020

    • Author(s)
      M. Matsuo, K. Shozugawa, Y. Guan, M. Komori, R. Okumura, Y. Iinuma and K. Takamiya
    • Journal Title

      KURRI Progress Report

      Volume: 2019 Pages: 184-184

    • Related Report
      2020 Annual Research Report
  • [Journal Article] A study on evaluation of redox condition of Tokyo Bay using chemical states of sedimentary iron as an indicator by means of Moessbauer spectroscopy.2019

    • Author(s)
      M. Komori, K. Shozugawa, Y. Guan and M. Matsuo
    • Journal Title

      Hyperfine Interactions

      Volume: 240 Issue: 1

    • DOI

      10.1007/s10751-019-1653-0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 河口域, 内陸河川および湖沼における硫酸還元菌の分布と鉄化合物に関する一考察2018

    • Author(s)
      杉森賢司・中村真樹・松尾基之
    • Journal Title

      東邦大学教養紀要

      Volume: 50 Pages: 71-79

    • NAID

      40021835429

    • Related Report
      2018 Research-status Report
  • [Journal Article] A study on the sedimentary environment of Tokyo-bay sediments under hypoxia using instrumental neutron activation analysis.2018

    • Author(s)
      M. Matsuo, K. Shozugawa, Y. Mihara, M. Komori, R. Okumura, Y. Iinuma and K. Takamiya
    • Journal Title

      KURRI Progress Report

      Volume: 2017 Pages: 146-146

    • Related Report
      2018 Research-status Report
  • [Presentation] A study on evaluation of redox condition of Tokyo Bay using chemical states of sedimentary iron as an indicator by means of Moessbauer spectroscopy.2019

    • Author(s)
      M. Komori, K. Shozugawa, Y. Guan and M. Matsuo
    • Organizer
      International Conference on the Applications of the Moessbauer Effect (ICAME2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 放射化学的手法を用いた貧酸素水塊環境下にある東京湾底質の堆積環境に関する研究2019

    • Author(s)
      松尾基之
    • Organizer
      日本放射化学会第63回討論会(2019)原子核プローブ分科会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Moessbauer spectroscopic study on the chemical states of iron in Tokyo-bay sediments under hypoxia.2019

    • Author(s)
      Y. Guan, M. Komori, K. Shozugawa and M. Matsuo
    • Organizer
      日本放射化学会第63回討論会(2019)
    • Related Report
      2019 Research-status Report
  • [Presentation] 貧酸素水塊下にある東京湾底質の堆積環境に関する研究2019

    • Author(s)
      松尾基之・小森昌史・小豆川勝見
    • Organizer
      平成30年度KUR専門研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] 貧酸素水塊環境下にある東京湾底質の堆積環境に関する研究2018

    • Author(s)
      松尾基之・小森昌史・小豆川勝見・奥村良・飯沼勇人・高宮幸一
    • Organizer
      第62回放射化学討論会(2018日本放射化学会年会)
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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