Abstract

The water soluble components were analyzed in the <TEX>$PM_{2.5}$</TEX> fine particles collected at the 1100 site of Mt. Halla for the spring seasons between 1998 and 2004. The <TEX>$PM_{2.5}$</TEX> mass concentrations were within <TEX>$13.4{\pm}9.6{\sim}21.7{\pm}20.0{\mu}g/m^3$</TEX>, and the concentrations of ionic components were in the order of nss-<TEX>$SO{_4}^{2-}$</TEX> > <TEX>$NH{_4}{^+}$</TEX> > <TEX>$NO{_3}{^-}$</TEX> > <TEX>$Ca^{2+}$</TEX> > <TEX>$K^+$</TEX> > <TEX>$Na^+$</TEX> > <TEX>$Cl^-$</TEX> > <TEX>$Mg^{2+}$</TEX>, in which the concentration of nss-<TEX>$SO{_4}^{2-}$</TEX>(<TEX>$3.41{\pm}2.42{\mu}g/m^3$</TEX>) was the highest. The concentrations of <TEX>$NH{_4}{^+}$</TEX>, <TEX>$SO{_4}^{2-}$</TEX>, and <TEX>$NO{_3}{^-}$</TEX>, the secondary pollutants, were respectively 0.60~1.50, 2.86~4.42, and <TEX>$0.24{\sim}1.57{\mu}g/m^3$</TEX>, which had occupied 88 % of the total ionic components, on the other hand, the concentrations of marine species were less than 5 %. The nss-<TEX>$SO{_4}^{2-}$</TEX> showed the high correlation with <TEX>$NH{_4}{^+}$</TEX>, <TEX>$K^+$</TEX>, so that <TEX>$NH{_4}{^+}$</TEX> and nss-<TEX>$SO{_4}^{2-}$</TEX> might exist in the form of <TEX>$(NH_4)_3H(SO_4)_2$</TEX> and <TEX>$(NH_4)_2SO_4$</TEX> in fine particles. From the backward trajectory analysis, in case of high concentrations of <TEX>$NH{_4}{^+}$</TEX> and nss-<TEX>$SO{_4}^{2-}$</TEX> simultaneously, the air masses were originated and stagnated at the east region of China for a while, then moved into the atmosphere of Jeju. However, in case of <TEX>$NO{_3}{^-}$</TEX> and nss-<TEX>$Ca^{2+}$</TEX>, the air masses originated at China and Siberia were moved into Jeju via the eastern China.