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KMID : 0382420000260020108
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 2 p.108 ~ p.115
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Study on Characteristics by Aerodynamic Diameter of Airborne Suspended Particulate Matters
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Kim Seong-Cheon
Kang Dal-Sun
Cha Young-Hee
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Abstract
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The mass fraction of PM_10 had a bimodal distribution in the middle of between 2.1 ㎛ through 3.1 ㎛, and the average mass fraction of particles less than 2.1~3.1 ㎛ was 54.1%. The concentrations were 59.9 ㎍/㎥ for PM_10, 143.4 ng/㎥ for Zn, 1.52 ng/㎥ for Cd, 30.5 ng/㎥ for Cr, 71.3 ng/㎥ for Pb and 890.8 ng/㎥ for Fe, respectively. For the concentration of PM_10 and metallic elements by seasonal variations, PM_10 showed bimodal distribution, while metallic elements showed different distributions by their sources. The ratios of fine particles to total mass were 0.45 for PM_10, 0.41 for Cr, and 0.20 for Fe, 0.57 for Zn, 0.68 for Cd and 0.63 for Pb, respectively. That facts indicated that PM_10, Zn, Cd, Cr and Pb were from anthropogenic sources, and Fe was from natural source. The geometric means and geometric standard deviations by seasonal variations were 3.6 ㎛, 2.31 ㎛ in winter, 3.0 ㎛, 2.49 ㎛ in spring, 2.7㎛, 2.03㎛ in summer respectively. And, total efficiency of cascade impactor by seasonal variations were 49.6 % in winter, 45.9% in spring and 44.5% in summer.
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