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| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
ENVR.P-672 |
| Subject |
Systematic Study on Hygroscopic Behavior of Ammonium Sulfate and Ammonium Nitrate Mixture Particles |
| Authors |
Li Wu, CHUL-UN RO1,*
Inha University, China
1Department of Chemistry, Inha University, Korea
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| Abstract |
Inorganic species such as ammonium sulfate (AS) and ammonium nitrate (AN) occupy 20-50% among the ambient atmospherical fine aerosol mass and significantly affect air quality, visibility degradation, and climate change. In the present work, laboratory generated, micrometer sized, pure AS, AN, and AS-AN mixture aerosol particles of 7 mixing ratios (mole fraction of AS(XAS)=0.06, 0.15, 0.2, 0.28, 0.5, 0.6, 0.8), were examined systematically to observe their hygroscopic behavior, derive experimental phase diagrams, and obtain chemical micro-structures using in-situ Raman Microspectrometry (RMS). All the nebulized mixture particles experienced only one efflorescence at relative humidity (RH) ranging from 20%-40%, probably due to heterogeneous crystallization. Nebulized AS-AN mixture particles of XAS=0.06 showed single-stage transition at deliquescence relative humidity (DRH)=60.3%, while others exhibited two-stage deliquescence and all these experimental DRHs data are consistently higher than the theoretical values calculated from E-AIM model, might be due to the variation of crystallization when effloresced. AS and AN mixture can crystallize as the stable and/or metastable double salts (2AN·AS and 3AN·AS, respectively) and the degree of metastability differed under different mixing ratios as reported before. RMS study to clearly understand the hygroscopic behavior and crystallization of AS-AN mixtures is under progress and further results will be presented. |
| E-mail |
wswuli@naver.com |
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121st General Meeting of the KCS