Influences of sulfate and nitrate on the hygroscopic behaviour of coarse dust particles

Asian dust particles of diameter >1 μm collected in southwestern Japan were analyzed with environmental scanning electron microscopy. The hygroscopic behaviour of sea salt-free dust particles were investigated with respect to their contents of sulfate and nitrate. Sulfate- and nitrate-free dust p...

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Bibliographic Details
Published in:Atmospheric environment (1994) 2008-02, Vol.42 (4), p.822-827
Main Authors: Shi, Zongbo, Zhang, Daizhou, Hayashi, Masahiko, Ogata, Hiroko, Ji, Hezhe, Fujiie, Wataru
Format: Article
Language:English
Subjects:
Asian dust
Calcium nitrate
Earth, ocean, space
Exact sciences and technology
External geophysics
Gypsum
Heterogeneous chemistry
Hygroscopicity
Meteorology
Mineral aerosol
Particles and aerosols
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Summary:Asian dust particles of diameter >1 μm collected in southwestern Japan were analyzed with environmental scanning electron microscopy. The hygroscopic behaviour of sea salt-free dust particles were investigated with respect to their contents of sulfate and nitrate. Sulfate- and nitrate-free dust particles (not containing sulfur and nitrogen), as well as sulfate-containing ones, did not change in their crystalline morphology as relative humidity (RH) was increased from 15% to 90%. In contrast, calcium nitrate-containing dust particles appeared in aqueous phase even at 15% RH. These results indicate that nitrate formation on coarse dust particles could substantially enhance the hydrophilicity of the particles and possibly vice versa, whereas sulfate formation could not.
ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2007.10.037