Morphological and light-absorption characteristics of individual BC particles collected in an urban seaside area at Tokaimura, eastern central Japan

Feng Fu Fu, Kazuo Watanabe, Nobuo Shinohara, Xueqin Xu, Liangjun Xu, Tasuku Akagi

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)

抄録

To observe surface morphology and light-absorption property of different black carbon (BC) particles, different-sized aerosols were collected in Tokaimura (36.27°N, 140.36°E), an urban seaside area of eastern central Japan, using a high-volume Andersen type sampler during a whole year (Jan. to Dec. in 2004). The morphology of individual BC particle separated from different-sized aerosols was observed with Scanning Electron Microscope with Energy Dispersive X-ray Spectrometer (SEM-EDX) and four types of morphology were observed: 50 nm spherical particles, micrometer-sized plates with homogeneous surfaces, micrometer-sized spherical particles with homogeneous surfaces and micrometer-sized spherical particles with small holes on surfaces. The light-absorption property of BC particles with different morphology has been determined by infrared spectrometry (IRS) with a photoacoustic technique in a region of 400-4000 wavenumbers (cm- 1). All morphology BC particles showed a strong light-absorption during 500-3000 wavenumbers (cm- 1) with two strong broad peaks in 750-1100 and 1200-2200 wavenumbers (cm- 1), implying that all morphology BC particles can absorb a significant part of thermal infrared emitted from the earth (wavelength 4000-50,000 nm). The seasonal variation and the size-distribution of aerosols and its chemical components (e.g. C, Na, Cl, NH4+, NO3-, SO42-, Al, Ca, Mg and Fe) were also measured in this study. More than 55% of non-inorganic carbon (OC + BC) in the atmosphere was detected in the aerosols with a size smaller than 1.1 μm and the concentration of non-inorganic carbon in the atmosphere showed only a faint variation during a whole year, although the concentrations of total aerosols and its chemical components exhibited a distinct variation.

本文言語英語
ページ(範囲)273-282
ページ数10
ジャーナルScience of the Total Environment
393
2-3
DOI
出版ステータス出版済み - 4月 15 2008

!!!All Science Journal Classification (ASJC) codes

  • 環境工学
  • 環境化学
  • 廃棄物管理と処理
  • 汚染

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