エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
研究論文
超音速インパクタで分離・捕集された微小大気エアロゾル中のPAHs成分
古内 正美坂野 健夫木津 良一清水 良保大久保 敬久金岡 千嘉男
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2005 年 20 巻 2 号 p. 135-143

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A super-sonic impactor using a Laval nozzle, which was developed for size control of ultra-fine aerosol particles down to nano-size range, was applied to the sampling of ultra-fine ambient aerosol. Ambient aerosol was classified into two size fractions by the super-sonic impactor and PAHs in each fraction were analyzed as a typical index of anthropogenic air pollutants. The concentrations of individual PAH compounds in the particles collected by the supersonic impactor were compared with those collected on the backup filter and those of total suspended particulates in order to evaluate the wall loss as well as the influence of super-saturation of vapor components in the supersonic flow. As a result, ambient particles were successfully classified into two size fractions at 200-300 nm using the supersonic impactor. When the air was humid, the concentration of PAHs with benzene rings more than four in the smaller size fraction collected on the backup filter was decreased because the condensation of water vapor onto particles led to an increase in particle size. It was also suggested that there is a possibility of increased collection of semi-volatile compounds on the backup filter due to the super-saturation.

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© 2005 日本エアロゾル学会
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