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In-Situ Laser Detection for Aerosols and Toxic Chemicals associated with Aerosols

Research Project

Project/Area Number 13358009
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Environmental dynamic analysis
Research InstitutionThe University of Tokyo

Principal Investigator

NAGASAKI Shinya  The University of Tokyo, Graduate School of Frontier Sciences, Associate Professor, 大学院・新領域創成科学研究科, 助教授 (20240723)

Co-Investigator(Kenkyū-buntansha) HASEGAWA Shuichi  The University of Tokyo, Graduate School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (90262047)
YONEOKA Toshiaki  The University of Tokyo, Graduate School of Engineering, Research Associate=, 大学院・工学系研究科, 助手 (40013221)
TANAKA Satoru  The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (10114547)
UETA Shinzo  Mitsubishi Materials Co.Ltd., Director, 部長
KADO Shinichiro  The University of Tokyo, High Temperature Plasma Center, Associate Professor, 高温プラズマ研究センター, 助教授 (10300732)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥43,030,000 (Direct Cost: ¥33,100,000、Indirect Cost: ¥9,930,000)
Fiscal Year 2003: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2002: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2001: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Keywordsaerosol / toxic chemicals / laser detection / in-situ detection / breakdown / multi-photone / 多成分系 / レーザ誘起ブレイクダウン法 / Eu / TiO_2微粒子 / In-Situ定量計測 / レーザ誘起ブレイクダウン / 時間分解 / エアロゾル / カルシウム / 定量計測
Research Abstract

In this study, it was proved that laser breakdown causes through two main ionization mechanisms. One is multiphoton ionization, and the other is cascade ionization. From the breakdown of N_2 gas, it was founded that at low laser energy (<20mJ〜30mJ/pulse), cascade ionization effect was small, and multiphoton ionization effect was relatively large, and that at high laser energy(>20mJ〜30mJ/pulse), cascade ionization was main a mechanism. Introducing aerosols into N_2 gas led to promoting of cascade ionization of N_2 That is because of electrons produced on aerosols. Emission intensity from breakdown plasmas of Eu adsorbed on TiO_2 aerosols was founded to be larger than that of Eu existing freely from TiO_2. This is because of the size of aerosols. It is known that breakdown probability increases with the size of aerosols. On the other hand, the intensity of Ti I decreased as the amount of adsorbed Eu increased, meaning that TiO_2 was breakdowned by cascade ionization induced by electrons from adsorbed Eu.
Furthermore, the particles were completely dispersed in aqueous solutions and the realization of breakdown spectroscopic technique was validated by using the natural environmental waters. It was confirmed that the technique is useful for In-Situ quantitative detection of aerosols/dispersed particles in atmosphere and in environments and of toxic chemicals especially heavy metals associated with aerosols and particles.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 長崎晋也: "時間分解型レーザ誘起ブレイクダウン分光法によるTiO_2微粒子に吸着したEu(III)の計測"原子力バックエンド研究. 8・2. 191-193 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 長崎晋也: "微粒子計測における時間分解型レーザ誘起ブレイクダウン分光法の有効性とブレイクダウンプラズマのエネルギー伝播/伝達過程"日本原子力学会和文論文誌. 1・4. 472-476 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Nagasaki, S.: "Detection of Eu(III) associated with TiO_2 particles using time resolve laser-induced breakdown spectroscopy"Journal of Nuclear Fuel Cycle and Environment. Vol.8. 191-193 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Nagasaki, S.: "Efficiency of Time Resolved Laser Induced Breakdown Spectroscopy for Particle Detection and Energy Transfer of Breakdown Plasma"Journal of Atomic Energy Society of Japan. Vol.1. 472-476 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 長崎晋也: "微粒子計測における時間分解型レーザ誘起ブレイクダウン分光法の有効性とブレイクダウンプラズマのエネルギー伝播/伝達過程"日本原子力学会和文論文誌. 1・4. 472-476 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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