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

Zongbo Shi, Daizhou Zhang, Masahiko Hayashi, Hiroko Ogata, Hezhe Ji, Wataru Fujiie

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)822-827
Number of pages6
JournalAtmospheric Environment
Volume42
Issue number4
DOIs
Publication statusPublished - 2008 Feb
Externally publishedYes

Keywords

  • Asian dust
  • Calcium nitrate
  • Gypsum
  • Heterogeneous chemistry
  • Hygroscopicity
  • Mineral aerosol

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

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