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자료유형
학술저널
저자정보
저널정보
한국대기환경학회 한국대기환경학회지(영문) 한국대기환경학회지 제21권 제E1호
발행연도
2005.3
수록면
23 - 35 (13page)

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초록· 키워드

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Size distribution of particulate water-soluble ion components was measured at Gosan, Korea using a micro-orifice uniform deposit impactor (MOUDI). Sulfate, ammonium, and nitrate showed peaks in three size ranges; Sulfate and ammonium were of dominant species measured in the fine mode (Dp<1.8 μm). One peak was observed in the condensation mode (0.218~0.532 μm), and the other peak was obtained in the droplet mode (0.532~1.8 μm). Considering the fact that the equivalent ratios of ammonium to sulfate ranged from 0.5 to 1.0 in these size ranges, it is inferred that they formed sufficiently neutralized compounds such as (NH₄)₂SO₄and (NH₄)₃H(SO₄)₂during the long-range transport of anthropogenic pollutants. On the other hand, nitrate was distributed mainly in the coarse mode (3.1~6.2 μm) combined with soil and sea salt.
Two sets of MOUDI samples were collected in each season. One sample was collected when the concentrations of criteria air pollutants were relatively high, but the other represented relatively clean air quality. The concentrations of sulfate and ammonium particles in droplet mode were the highest in winter and the lowest in summer. When the air quality was bad, the increase of nitrate was observed in the condensation mode (0.218~0.282 μm). It thus suggests that the nitrate particles were produced through gas phase reaction of nitric acid with ammonia. Chloride depletion was remarkably high in summer due to the high temperature and relative humidity.

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Abstract

1. Introduction

2. Experiment

3. RESULT AND DISCUSSION

4. Conclusion

ACKNOWLEDGEMENT

REFERENCES

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