Analysis of the mixing state of airborne particles using a tandem combination of laser-induced fluorescence and incandescence techniques

Fumikazu Taketani, Yugo Kanaya, Takayuki Nakamura, Naoki Takeda, Kazuhiro Koizumi, Noritomo Hirayama, Takuma Miyakawa, Xiaole Pan, Nobuhiro Moteki, Nobuyuki Takegawa

    研究成果: Contribution to journalArticle査読

    1 被引用数 (Scopus)

    抄録

    We have developed a novel system for real-time measurement of the mixing state of aerosol particles using a tandem combination of laser-induced fluorescence (LIF) and incandescence (LII) techniques. The tandem analysis system comprises two chambers connected in series; particles are analyzed with LIF in the first chamber and LII in the second chamber. We analyzed identical particles using the two methods as judged by the time intervals of detection in the two chambers. This system provides information on the mixing state of fluorescent compounds and black carbon in single particles. Ground-based measurements of ambient particles were performed in Tokyo during October 26-29, 2012. We analyzed 43,881 particles with optical diameters greater than 0.4. μm. The fractions of particles with fluorescent composition, black carbon, and both were 14.2%, 2.3%, and 0.3%, respectively, which indicates the presence of internal mixtures of black carbon and fluorescent species in the ambient air for the first time. Mixtures of biological materials (estimated from fluorescence patterns) and black carbon were also detected. The fluorescence patterns of single particles with and without black carbon were almost identical, suggesting that particles with both black carbon and fluorescent composition might be formed by aggregation in ambient air.

    本文言語英語
    ページ(範囲)102-110
    ページ数9
    ジャーナルJournal of Aerosol Science
    87
    DOI
    出版ステータス出版済み - 9 1 2015

    All Science Journal Classification (ASJC) codes

    • 環境工学
    • 汚染
    • 機械工学
    • 流体および伝熱
    • 大気科学

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