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Rapid and simple detection method for radioactive strontium in case of emergency

Research Project

Project/Area Number 16K00576
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental impact assessment
Research InstitutionIbaraki National College of Technology

Principal Investigator

CHIBA Kaori  茨城工業高等専門学校, 国際創造工学科, 准教授 (50415775)

Co-Investigator(Kenkyū-buntansha) 小池 正記  広島工業大学, 工学部, 教授 (00356958)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsストロンチウム / ジピコリン酸 / MALDI-TOF-MS / 質量分析 / NMR / HPLC / MALDI 質量分析 / 迅速分析 / MALDI-TOF 質量分析 / MALDI-TOF / 環境技術
Outline of Final Research Achievements

Complexes of dipicolinic acid that is used as a new matrix of the time-of-flight matrix-assisted laser ionization mass spectrometer (MALDI-TOF-MS) with Sr2+, or with other ions produced from 90Sr by beta-decaying, such as Y and Zr, were analyzed using nuclear magnetic resonance (NMR) and liquid chromatography (HPLC). As a result, it was found that strontium and dipicolinic acid form a 1:1 complex, whereas Y and Zr produced by β-decay of 90Sr form high molecular weight multimers. From the results of this study, it was shown for strontium that the higher tendency to form a 1:1 complex with the matrix molecule, dipicolinic acid, facilitates the vaporization of strontium in the MALDI-TOF-MS experiment. This was suggested to be an important factor leading to the result that monovalent strontium ion was selectively observed by the dipicolinic MALDI-TOF-MS experiment.

Academic Significance and Societal Importance of the Research Achievements

本手法は、東日本大震災に伴う福島第一原子力発電所における原子力災害をきっかけに、非常時、β線放出核種である放射性Srを、迅速、簡便に検出する手法として開発された。日本が世界に先駆けて開発したMALDI-TOF-MSに、食品に含まれる安全なジピコリン酸をマトリックスとして用いることで、ジピコリン酸とコンパクトな複合体を形成するSrイオンが効率よく検出される。一方、ベータ崩壊の産物であるYやZrは、ジピコリン酸を多量体化させるため検出されない。特殊な質量分析装置や高度な測定技術、煩雑で時間を要する試料調製が不要の本手法は、万が一の原子力災害への最も適切な備えとなるであろう。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (2 results)

All 2019

All Presentation (2 results)

  • [Presentation] NMR and HPLC analysis of the interactions between dipicolinic acid and three ions, Sr, Y, and Zr2019

    • Author(s)
      Yuki Takaku, Kaori Chiba
    • Organizer
      日本化学会 第100春季年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ジピコリン酸を用いた放射性Srの迅速検出法2019

    • Author(s)
      高久 侑己、千葉薫
    • Organizer
      第30回 日本化学会関東支部 茨城地区研究交流会
    • Related Report
      2019 Annual Research Report

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Published: 2016-04-21   Modified: 2024-12-25  

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