Relationship between surface morphology and chemical composition of spheroidal carbonaceous particles within sediment core samples recovered from Osaka Bay,Japan |
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Authors: | Akiko Murakami-Kitase Takamoto Okudaira Jun Inoue |
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Institution: | (1) Department of Geosciences, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyosi-ku, Osaka 558-8585, Japan |
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Abstract: | Spheroidal carbonaceous particles (SCPs) are produced by the high-temperature combustion of fossil fuels and are emitted to
the atmosphere. Previous studies are divided regarding whether SCPs derived from the combustion of various fossil fuels can
be identified based on their surface morphologies and chemical compositions. In this study, we examined the surface morphology
and chemical composition of SCPs in sediment core samples collected from Osaka Bay, Japan, with the aim of evaluating the
usefulness of SCPs morphology in identifying their origin. Scanning electron microscope (SEM) observations reveal three distinct
surface morphologies: (1) smooth, (2) rough and irregular, and (3) convoluted and layered. According to a morphological classification
scheme proposed previously, the former two morphologies correspond to coal-derived carbon particles, whereas the latter corresponds
to oil-derived carbon particles. In terms of the chemical compositions of the particles with different morphologies, as analyzed
by energy-dispersive spectroscopy, linear discriminant analysis reveals that the two fuel types can be distinguished. An overall
success rate of >90% of reference of morphologically classified material correctly assigned to two groups that are chemically
different each other, indicating a relationship between surface morphology and chemical composition. This result suggests
that morphological characterization based on conventional SEM observations is useful in identifying the source fuel of SCPs. |
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