Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Chemical Properties of the Individual Asian Dust Particles Clarified by Micro-PIXE Analytical System

  • Ma, Chang-Jin (Department of Environmental Science, Fukuoka Women's University) ;
  • Kang, Gong-Unn (Department of Medical Administration, WonKwang Health Science University) ;
  • Kasahara, Mikio (Graduate School of Energy Science, Kyoto University) ;
  • Tohno, Susumu (Graduate School of Energy Science, Kyoto University)
  • Received : 2014.05.23
  • Accepted : 2014.08.05
  • Published : 2014.09.30
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Abstract

The present study was undertaken to evaluate the chemical characteristics of Asian dust (hereafter called "AD") particles with the aid of the most advanced micro-PIXE (Particle-induced X-ray emission) analytical technique. To this end, size-selected particles were sampled on a rural peninsula of Korea (Byunsan, 35.37N; 126.27E) during AD and non-AD periods in 2004. The coarse particle (> $2{\mu}m$) number density during an AD event were 170 times higher than those of the non-AD counterpart. The average net-count of silica in individual particles collected on AD event was roughly 11 times higher than that of non-AD counterpart. The X-ray net-counts of trace elements (Zn, Co, Mn, and V) were also considerably high in AD relative to the non-AD day. Particle classification based on the inter ratio analysis of elemental net-count suggests that a large portion of the coarse particles collected during AD event underwent chemical transformation to a certain degree. The visual interpretation of micro-PIXE elemental maps and elemental localization data in and/or on individual AD particles clarified the internal mixture of AD particles with sea-salt and artificial metallic particles.

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References

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