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Study on arsenic accumulation mechanism in surface layer of paddy soils using advanced X-ray spectroscopy and its application to soil remediation technique

Research Project

Project/Area Number 19H03087
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 41050:Environmental agriculture-related
Research InstitutionEhime University

Principal Investigator

Mitsunobu Satoshi  愛媛大学, 農学研究科, 准教授 (70537951)

Co-Investigator(Kenkyū-buntansha) 松本 真悟  島根大学, 学術研究院農生命科学系, 教授 (00346371)
白石 史人  広島大学, 先進理工系科学研究科(理), 准教授 (30626908)
加藤 真悟  国立研究開発法人理化学研究所, バイオリソース研究センター, 上級研究員 (40554548)
濱村 奈津子  九州大学, 理学研究院, 教授 (50554466)
SHUKLA ELVIS.ANUP  愛媛大学, 防災情報研究センター, 准教授 (70833721)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2021: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2020: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2019: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Keywords水田土壌 / ヒ素 / スペシエーション / 微生物 / 水田 / 土壌修復 / XAFS
Outline of Research at the Start

水田土壌は、世界30億人以上に主食 (コメ) を提供する食糧生産地であり、とくにアジア圏の人々にとって最重要な農業資源の1つである。しかし近年、水田環境を脅かす土壌汚染や水質汚染が日本を含めたアジア諸国で頻発している。本研究ではとくに、現在世界で最も深刻な水田汚染である「無機ヒ素 (As) による水田土壌汚染」を対象とし、① 我々が初めて見出した水田土壌表層へのAs濃集現象の化学的、(微)生物学的メカニズムを解明し、② さらにこのAs濃集現象を応用した低コストかつ簡便な新規土壌修復法の確立を目指すことを目的とする。

Outline of Final Research Achievements

In this study, we investigated the behavior of inorganic arsenic (As), which is currently the most serious pollutant of rice paddies in the world paddy soils. In particular, we investigated the factors related to the As accumulation in the surface soil layer that occurs specifically in waterlogged paddy soils. The experimental results showed that As is reduced in the deep layer and diffused/re-oxidized to the oxidized surface layer due to the depth-differentiation of the redox state caused by waterlogging, and that As is easily adsorbed on soil minerals. The obtained findings can be applied to new soil remediation methods for efficient removal of As from pollutant paddy fields, as well as to elucidate the regional As behavior at pollutant paddy field sites in Asian countries and Japan.

Academic Significance and Societal Importance of the Research Achievements

ヒ素は水田土壌のみならず最も深刻な土壌・水質汚染を引き起こしている有害元素の一つである。土壌中で特異的に起きる濃集現象の本質的な要因を分子レベルで明らかにした本研究はヒ素の環境中における拡散濃集メカニズムを考察する上でも重要な知見となる。将来的には、表層土壌へのヒ素濃集現象を応用することで、汚染水田からAsを高効率、低コスト、低環境負荷で除去する新たな土壌修復法へ応用できると考えており、今後も更なる研究を進めていく。

Report

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

    (6 results)

All 2022 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] A new tool for disinfecting household drinking water for rural residents: protonated mordenite-embedded sheet2022

    • Author(s)
      Erni Johan , Fernando , Salma Sadia , Satoshi Mitsunobu , Soichiro Hirai , Naoto Matsue
    • Journal Title

      Journal of Water, Sanitation and Hygiene for Development

      Volume: 12 Issue: 3 Pages: 271-277

    • DOI

      10.2166/washdev.2022.202

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Millimeter-scale topsoil layer blocks arsenic migration in flooded paddy soil2020

    • Author(s)
      Mitsunobu, S., Toda, M., Hamamura, N., Shiraishi, F., Tominaga, Y., Sakata, M.
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 274 Pages: 211-227

    • DOI

      10.1016/j.gca.2020.01.038

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A new method for direct observation of microscale multielemental behavior in waterlogged soil: μXRF-μXAFS combined live soil imaging chamber (LOACH)2020

    • Author(s)
      Mitsunobu Satoshi、Hiruta Takuya、Fukudo Jinsuke、Narahashi Yuna、Hamamura Natsuko、Matsue Naoto、Takahashi Yoshio
    • Journal Title

      Geoderma

      Volume: 373 Pages: 114415-114415

    • DOI

      10.1016/j.geoderma.2020.114415

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A new method for direct observation of microscale multielemental behaviors in waterlogged soil: microXRF-microXAFS combined live soil imaging chamber (LOACH)2020

    • Author(s)
      Mitsunobu S, Hiruta T, Fukudo J, Narahashi Y, Hamamura N, Matsue N, Takahashi Y
    • Journal Title

      Geoderma

      Volume: 231 Pages: 16-25

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 1ミリメートルの空間分解で水田土壌の間隙水を採取する方法の確立2020

    • Author(s)
      光延聖・福堂仁介・松枝直人(愛媛大・院農)
    • Organizer
      日本土壌肥料学会関西支部会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 生きた水田土壌を放射光で観る~元素の濃度分布と化学状態をマイクロスケールで直接観察する手法の確立~2019

    • Author(s)
      光延 聖・福堂 仁介・昼田 拓哉
    • Organizer
      日本土壌肥料学会年会
    • Related Report
      2019 Annual Research Report

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

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