Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Chemical Composition Characteristics of Size-fractionated Particles during Heavy Asian Dust Event in Spring, 2010

2010년 봄철 고농도 황사의 입경별 화학조성 특성

  • Lee, Dong-Eun (Department of Chemistry, Jeju National University) ;
  • Kim, Won-Hyung (Department of Chemistry, Jeju National University) ;
  • Ko, Hee-Jung (Department of Chemistry, Jeju National University) ;
  • Oh, Yong-Soo (Department of Chemistry, Jeju National University) ;
  • Kang, Chang-Hee (Department of Chemistry, Jeju National University)
  • Received : 2013.05.09
  • Accepted : 2013.05.29
  • Published : 2013.06.30
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Abstract

The size-fractionated aerosol samples have been collected at Gosan Site of Jeju Island during the spring season of 2010, in order to examine the chemical composition characteristics of the Asian Dust and Non-Asian Dust particles. The concentrations of ${HCO_3}^-$, Al, and nss-$Ca^{2+}$ in $PM_{10}$ had tremendously increased during the heavy Asian Dust (March 20, 2010). The concentration ratios of Asian Dust to Non-Asian Dust for the soil species (nss-$Ca^{2+}$, ${HCO_3}^-$, Al, Fe, Ti, Mn) were 12.2~30.7, meanwhile those for the anthropogenic species (nss-${SO_4}^{2-}$, ${NH_4}^+$, ${NO_3}^-$, $K^+$, Zn, Pb, and Cu) were 2.9~7.8. During the heavy Asian Dust event, the concentration increase of ${NO_3}^-$ in $PM_{2.5}$ were much more apparent than those of nss-${SO_4}^{2-}$ and ${NH_4}^+$, and the soil species (nss-$Ca^{2+}$ and ${HCO_3}^-$) showed much higher concentration increase. The neutralization factor of $NH_3$ was higher than that of $CaCO_3$. However, the neutralization factor of $CaCO_3$ in $PM_{10}$ was exceptionally high during the heavy Asian Dust, showing the evidence of heavy migration of soil particles. From the study for size fractionated particles, it was found that nss-${SO_4}^{2-}$ and ${NH_4}^+$ were mostly distributed in fine particle mode, on the other hand, ${NO_3}^-$ existed evenly in both fine and coarse particle modes, and the soil species (nss-$Ca^{2+}$, Al, Fe, etc.) were mainly in the latter mode. During the heavy Asian Dust, in particular, the concentrations of ${NH_4}^+$, nss-${SO_4}^{2-}$, $K^+$, Zn, and Pb had increased in coarse particle mode as well.

Keywords

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