Abstract
The concentration characteristics of atmospheric particle matters (PM) including <TEX>$PM_{2.5},\;PM_{10}$</TEX>, and TSP were evaluated through the measurement data of <TEX>PM_{2.5}$</TEX> (fine particulate), <TEX>PM_{10-2.5}$</TEX> (coarse particulate), and <TEX>PM_{over-10}$</TEX> collected using a MCI (multi-nozzle cascade impactor) sampler of a three-stage filter pack in spring of 2006 in Iksan area. During the sampling period of 10-15 March and 24 days from 8 April to 2 May, 32 samples for PM of each size fractions were collected, and then measured for PM mass concentrations and water-soluble inorganic ion species. Average concentrations of <TEX>$PM_{2.5},\;PM_{10}$</TEX>, TSP were <TEX>$57.9{\pm}44.1mg/m^3$</TEX>, <TEX>$96.6{\pm}89.1mg/m^3$</TEX>, and <TEX>$114.8{\pm}99.7mg/m^3$</TEX>, respectively. Water-soluble inorganic ion fractions to PM mass were found to be 36.5%, 18.0%, and 11.1% for <TEX>$PM_{2.5}$</TEX>, <TEX>$PM_{10-2.5}$</TEX> and <TEX>$PM_{over-10}$</TEX>, respectively. By showing the high concentrations of PM samples during Asian dust events, those three fractions of PM were distinguished between the samples of Asian dust event and the samples of no event. However, the increase of PM concentrations observed during Asian dust events showed a different pattern for some Asian dust events. The differences of those three fractions in the size distribution may depend on differences on place of occurrence of Asian dust storm and course of transport from China continent to Iksan area in Korea. However, the extent of PM mass contribution during Asian dust events was generally dominated by the coarse particles rather than the fine fraction of PM. The variations of water-soluble inorganic ion species concentration in those three PM fractions between the samples of Asian dust event and the samples of no event were also discussed in this study.
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