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자료유형
학술저널
저자정보
저널정보
한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제21권 제4호
발행연도
2005.8
수록면
439 - 458 (20page)

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An automated analysis system for water soluble constituents in PM_(2.5) has been developed. The system consists of a high capacity multi tube diffusion scrubber (MTDS), a low temperature particle impactor (LTPI), and two ion (anion and cation) chromatography (IC) systems. Atmospheric particles have been collected by passing sample air through a thermostated MTDS followed by a LTPI. This system allows simultaneous measurements of soluble ions in PM_(2.5) at 30 minutes interval. At the air sampling flow rate of 1.0 L/min, the detection limits of the overall system are in the order of tens of ng/㎥. This system has been successfully used for the measurement of particulate components of Seoul air from April 2003 to January 2004. SO₄²-, NO₃-, NH₄+, NO₂-, Cl-, Na+, K+, Ca²+, and Mg²+ are the major ionic species for PM_(2.5) at Seoul. Among them, SO₄²-, NO₃- and NH₄+ are the most abundant ions, contributed up to 86% of the total and the concentrations were higher than those in any other urban sites in the world except for Chinese cities. There are high pollutant episodes which contribute about 15~20% of annual average values of the major ions. During the episode, the air parcels were transported from the asian continent and PM_(2.5) were significantly neutralized. This suggests that aged and long range transported pollutants caused the high pollutant episodes. They showed a distinct daily and seasonal variations:they showed a peak in the early morning caused by the night-time accumulation of particulate matters. Atmospheric reactions including gas-to-particle reactions and inter-particle reactions and meteorological parameters including relative humidity and ambient temperature were described with related to the PM_(2.5) concentrations. All of the ionic species showed higher concentrations during the spring than those for summer and winter.

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3. 결과 및 고찰

4. 결론 및 요약

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