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Molecular level analysis of dissolved organic matters for investigating origin and transport mechanisms of dissolved iron in watersheds

Research Project

Project/Area Number 19H02271
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22060:Environmental systems for civil engineering-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Manabu Fujii  東京工業大学, 環境・社会理工学院, 准教授 (30598503)

Co-Investigator(Kenkyū-buntansha) 權 垠相  東北大学, 理学研究科, 准教授 (10360538)
菊地 哲郎  国立研究開発法人国際農林水産業研究センター, 生産環境・畜産領域, 任期付研究員 (50453965)
伊藤 紘晃  熊本大学, くまもと水循環・減災研究教育センター, 助教 (80637182)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2020: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2019: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Keywords溶存鉄 / 溶存有機物 / 河川流域 / 沿岸域 / 輸送機構 / 質量分析 / 微量金属 / 河川・沿岸域 / 腐植物質 / 森は海の恋人 / 自然有機物 / 分子組成 / 分子同定アルゴリズム / 鉄 / 有機物 / 溶存鉄の起源 / 分子レベル解析 / 有機錯体 / 流域
Outline of Research at the Start

生物生産性の高い沿岸域を維持する上で、陸域から供給される溶存鉄は重要な役割を担っている。溶存鉄の多くは腐植物質などの有機物に結合し、下流沿岸域まで輸送されると考えられているが、その起源や輸送機構の多くは未解明である。本研究では、有機鉄錯体の分子組成や配位構造を1分子レベルで精密に調べ上げ、沿岸域における有機鉄の起源や流域での鉄輸送メカニズムに関して世界を牽引する先端的な知見を創出する。本研究から、鉄の動態を考慮した健全な沿岸域環境を創出するための土地利用形態の提案等を含め、社会的価値の高い沿岸域を将来にわたり永続的に保全していくために必要な科学的知見が得られる。

Outline of Final Research Achievements

Dissolved iron transported from rivers and other terrestrial sources plays important roles in maintaining the coastal and marine productivity. Most of the dissolved iron is likely to be transported from river basins to coastal waters in the form of complexes with dissolved organic matters. However, the molecular level mechanism of transport has not been fully understood. This study therefore aimed to investigate the molecular composition and origin of dissolved organic matters that are highly relevant to dissolved iron via the molecular level analysis using high-resolution mass spectrometry and advanced molecular composition identification algorithms. As a result, 259 dissolved organic molecules highly correlated with dissolved iron were obtained in downstream regions such as coastal waters, and most of them were found to be CHO-type organic matters with small molecular weight and highly decomposed status.

Academic Significance and Societal Importance of the Research Achievements

本研究は、高分解能質量分析を用いて下流域で溶存鉄と関連性の高い259の有機分子組成を抽出し、その分子的特性を明らかにすることができた点において学術的新規性が高い。また、下流域で存在するCHO型有機物組成の多くが上流域でも検出されたことは、溶存鉄と相関のある有機分子組成が上流域から輸送されてきたことを示唆する結果と言える。すなわち、本研究成果は、沿岸域への微量金属輸送や生物生産性の維持において、上流から供給される溶存有機物が重要な役割を担っていることを示唆している。従って、沿岸域生態系を保全する流域土地利用の提案という観点からも社会的意義のある結果である。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (10 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results) Presentation (3 results) (of which Invited: 3 results) Remarks (1 results)

  • [Int'l Joint Research] IWW Water Centre(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Formula Assignment Algorithm for Deuterium-Labeled Ultrahigh-Resolution Mass Spectrometry: Implications of the Formation Mechanism of Halogenated Disinfection Byproducts2022

    • Author(s)
      Fu Qing-Long、Fujii Manabu、Watanabe Akari、Kwon Eunsang
    • Journal Title

      Analytical Chemistry

      Volume: 94 Issue: 3 Pages: 1717-1725

    • DOI

      10.1021/acs.analchem.1c04298

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of an Internal Calibration Algorithm for Ultrahigh-Resolution Mass Spectra of Dissolved Organic Matter2022

    • Author(s)
      Fu Qing-Long、Fujii Manabu、Kwon Eunsang
    • Journal Title

      Analytical Chemistry

      Volume: 94 Issue: 30 Pages: 10589-10594

    • DOI

      10.1021/acs.analchem.2c01342

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Export of dissolved iron from river catchments in northeast Japan2021

    • Author(s)
      Endo Yuta、Allam Ayman、Natsuike Masafumi、Yoshimura Chihiro、Fujii Manabu
    • Journal Title

      Landscape and Ecological Engineering

      Volume: 17 Issue: 2 Pages: 75-84

    • DOI

      10.1007/s11355-020-00435-6

    • NAID

      40022539014

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development and comparison of formula assignment algorithms for ultrahigh-resolution mass spectra of natural organic matter2020

    • Author(s)
      Fu Qing-Long、Fujii Manabu、Riedel Thomas
    • Journal Title

      Analytica Chimica Acta

      Volume: 1125 Pages: 247-257

    • DOI

      10.1016/j.aca.2020.05.048

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development and Application of a High-Precision Algorithm for Nontarget Identification of Organohalogens Based on Ultrahigh-Resolution Mass Spectrometry2020

    • Author(s)
      Fu Qing-Long、Fujii Manabu、Kwon Eunsang
    • Journal Title

      Analytical Chemistry

      Volume: 92 Issue: 20 Pages: 13989-13996

    • DOI

      10.1021/acs.analchem.0c02899

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 流域における溶存有機物の多様性と将来変化について2020

    • Author(s)
      藤井 学,和田光央,Qing-Long Fu
    • Organizer
      第 23 回日本水環境学会シンポジウム
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 域での微量金属と有機物の動態に関する研究:森と海のつながりの視点から2020

    • Author(s)
      藤井学
    • Organizer
      スマートシティディスプレイの実装プロジェクトセミナー
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 沿岸域における鉄と有機物の動態に関する研究2019

    • Author(s)
      藤井学, 吉村千洋
    • Organizer
      第22 回日本水環境学会シンポジウム
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Remarks] 東京工業大学 藤井 学

    • URL

      https://sites.google.com/site/manabufujiiattit/home

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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