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Redistribution of REE during transformation of ferrihydrite in natural groundwater

Research Project

Project/Area Number 16K17836
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionIndustrial Research Institute of Ishikawa

Principal Investigator

Munemoto Takashi  石川県工業試験場, 化学食品部, 技師 (00745937)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsフェリハイドライト / 希土類元素 / 相転移 / 原位置試験
Outline of Final Research Achievements

In the present study, (1) rare earth elements distribution between groundwater and colloids in deep granitic groundwater, (2) Sorption behavior of REE onto ferrihydrite, (3) Transformation experiments of ferrihydrite in natural groundwater were investigated. The results showed (1) Light REE enriched colloids were mobile in natural granitic groundwater. They affected REE patterns of the heavy REE enriched groundwater. (2) In laboratory experiments, almost all of the REE were sorbed around neutral pH. The REE surface complex possibly changed with pH. (3) Transformation of ferrihydrite in natural granitic groundwater were inhibited possibly by aqueous species.

Academic Significance and Societal Importance of the Research Achievements

現在まで、室内実験における準安定相の相転移挙動は水質条件(pHや酸化還元条件など)や相転移の妨害イオンの有無、微生物の活動などによって相転移プロセス・メカニズムが変化することが分かってきた。しかし、実際の天然の水質環境では、相転移挙動に影響を与える要因の複雑さから、天然環境に適応可能な統一的な解釈には至っていなかった。本研究で得られた成果により、天然環境において有害元素に対して高い吸着能を要する準安定鉱物の、地球表層環境における元素の移動におよぼす影響として、相転移の阻害現象が準安定鉱物の安定性に大きく影響している可能性が示唆された。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (2 results)

All 2018 2017

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

  • [Journal Article] Characterization of rare earth elements (REEs) associated with suspended particles in deep granitic groundwater and their post-closure behavior from a simulated underground facility2017

    • Author(s)
      Iwatsuki Teruki、Munemoto Takashi、Kubota Mitsuru、Hayashida Kazuki、Kato Toshihiro
    • Journal Title

      Applied Geochemistry

      Volume: 82 Pages: 134-145

    • DOI

      10.1016/j.apgeochem.2017.04.016

    • NAID

      120006502073

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Inhibition effect of transformation of ferrihydrite in granitic groundwater from the Mizunami Underground Research Laboratory.2018

    • Author(s)
      Munemoto Takashi, Watanabe Yusuke, Hayashida Kazuki and Iwatsuki Teruki
    • Organizer
      Goldschmit2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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