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Development of an online analysis method for measuring refractory sulfate and organic aerosols

Research Project

Project/Area Number 20H04310
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionTokyo Metropolitan University

Principal Investigator

Takegawa Nobuyuki  東京都立大学, 理学研究科, 教授 (00324369)

Co-Investigator(Kenkyū-buntansha) 三澤 健太郎  東京都立大学, 理学研究科, 助教 (10431991)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2020: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Keywords環境分析 / 難揮発性エアロゾル / 質量分析計 / 熱脱離 / オンライン分析
Outline of Research at the Start

エアロゾルの直接・間接効果は気候変動予測において重要である。本研究では、レーザー脱離型エアロゾル質量分析計を構築し、難揮発性成分を含む硫酸塩・有機エアロゾル濃度のオンライン定量法を確立することを目的とする。粒子捕集やレーザー脱離条件を最適化し、複数の化学種が混合した粒子の分類法を開発することが重要な課題となる。本装置を用いて大気観測を行い、グローバルなエアロゾル収支の理解に向けた基盤構築も目指す。

Outline of Final Research Achievements

Sulfate and organic compounds contribute to the major fraction of fine particle mass in the atmosphere. We have developed a novel particle mass spectrometer to measure non-refractory and refractory sulfate and organic compounds (rTDMS). Aerosol particles introduced into a vacuum chamber are collected on a cup-shaped graphite particle collector. A focused carbon dioxide laser coupled with the graphite collector enables a high desorption temperature (~1200 K). The temporal profiles of ion signals associated with increases in the temperature of the graphite collector were analyzed to separately quantify non-refractory and refractory sulfate compounds. We have also proposed a new method to quantify sodium and potassium salts (nitrate, chloride, and sulfate) using the rTDMS. The laboratory experiments demonstrated the proof of concept under well-controlled conditions. Further modifications are needed to deploy the rTDMS for ambient measurement of sea salt particles.

Academic Significance and Societal Importance of the Research Achievements

硫酸塩と有機物は微小エアロゾルの主成分であり、グローバルな対流圏に普遍的に存在する。エアロゾルの直接・間接効果は、気候変動予測の主要な不確実要因となっている。本研究で開発した装置において、グラファイト製粒子捕集体と炭酸ガスレーザーの効果的な組み合わせにより、従来法では困難であった難揮発性硫酸塩エアロゾルのオンライン定量が初めて可能となった。本装置を広域大気観測に応用することで、難揮発性成分を含む硫酸塩・硝酸塩・有機エアロゾルの全体像の解明に貢献することが期待される。

Report

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

    (6 results)

All 2022 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] A new method to quantify particulate sodium and potassium salts (nitrate, chloride, and sulfate) by thermal desorption aerosol mass spectrometry2022

    • Author(s)
      Kobayashi, Y. and Takegawa, N.
    • Journal Title

      Atmos. Meas. Tech.

      Volume: 15 Issue: 4 Pages: 833-844

    • DOI

      10.5194/amt-15-833-2022

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a novel particle mass spectrometer for online measurements of refractory sulfate aerosols2021

    • Author(s)
      Kobayashi, Y., Ide, Y., and Takegawa, N.
    • Journal Title

      Aerosol Sci. Technol.

      Volume: 55 Issue: 4 Pages: 371-386

    • DOI

      10.1080/02786826.2020.1852168

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 多分散エアロゾルを用いた粒子組成分析計の校正方法の開発:簡易型粒径分布測定装置の評価2022

    • Author(s)
      小林 優也, 竹川 暢之
    • Organizer
      第27回大気化学討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A new method for quantifying sodium sulfate, sodium nitrate, and sodium chloride aerosols2021

    • Author(s)
      Kobayashi, Y. and Takegawa, N.
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] A new method to quantify particulate sodium and potassium salts (sulfate, nitrate, and chloride) by thermal desorption aerosol mass spectrometry2021

    • Author(s)
      Kobayashi, Y. and Takegawa, N.
    • Organizer
      AAAR 39th Annual Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of a novel particle mass spectrometer for online measurements of refractory sulfate aerosols2020

    • Author(s)
      Kobayashi, Y., Ide, Y., and Takegawa, N.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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