Development of a characterization method for environmental aerosol particles including diesel exhaust particles.

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  • ディーゼル排気微粒子などを含む大気環境微粒子のキャラクタリゼーション法の開発
  • ディーゼル ハイキ ビリュウシ ナド オ フクム タイキ カンキョウ ビリュウシ ノ キャラクタリゼーションホウ ノ カイハツ

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Abstract

Information concerning the chemical composition of such light elements as carbon is one of the most important factors for the accurate characterization of environmental aerosol particles: diesel exhaust particles (DEP), tire dust particles, etc. In the conventional energy dispersive X-ray spectrometer (EDS), on general principles, it was impossible to detect the characteristic X-rays of light elements below an atomic number of 10. These characteristic X-rays can be detected by using a recently developed EDS with a polypropylene ultra-thin-layer detection window. In this study, we tried to accurately charactarize DEPs and tire dust particles by using an electron probe microanalysis (EPMA) apparatus equipped with this novel EDS, and developed a novel sampling method for preparation and collection. It was clarified that an EPMA sample holding environmental particles on a gold surface rigidly could be prepared by the developed sampling method for preparation or collection. From scanning electron microscope (SEM) images and the X-ray spectra of individual particle, such as a DEP, accurate information concerning the shape and chemical composition could be given. A clear source apportionment of tire dust particles and minerals of soil particles, whose X-ray spectrum patterns, except for light element information, are similar, was realized with the carbon Kα X-ray intensity as a direct estimation index.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 50 (4), 237-245, 2001

    The Japan Society for Analytical Chemistry

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