Characteristics of atmospheric suspended soil particles in the Asian dust-storm period in Kobe city

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  • 神戸市における黄砂時の大気中の浮遊土壌粒子の特徴
  • コウベシ ニ オケル コウサジ ノ タイキ チュウ ノ フユウ ドジョウ リュウシ ノ トクチョウ

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Atmospheric soil particles were collected in the Asian dust-storm period by using low pressure andersen impacter in Kobe city in April 2003 to investigate the characteristics of the Asian dust-storm particles. These samples were analyzed by field emission scanning electron microscopy (FE-SEM) equipped with an energy dispersive X-ray spectrometer. These soil particles were divided into five groups based on characteristics of their chemical compositions such as Si-rich, SiAl-rich, SiAl+Na/K/Ca, SiAlK+Fe/Mg and SiAl+Na/K/Ca/Mg particles. Morphology and compositional characteristics of all the individual soil particles were examined by FE-SEM. The soil particles contained sulfur, chlorine and heavy metal elements were found in the Asian dust-storm period in many case. The maximum amount of the soil particles in the Asian dust-storm period occurred in the 1.17μm to 3.45μm size fraction. The amount of the soil particles in this size were around 38%, while that of the soil particles in same size range in non-Asian dust-storm period were around 15%. The distribution of the number of the soil particles in air are strongly influenced by the soil particles derived from the Asian dust-storm from these results. Asian dust-storm particles are mainly composed of the compound of minute soil particles with sea salt, Fe ball and sulfate particle etc. These soil particles are mutually attached to make single slightly large soil particle. These facts suggest that the Asian dust-storm particles were generated by mutually attachment of minute soil particles during the Asian dust-storm transportation process.

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