Generation of submicron Arizona test dust aerosol. Chemical and hygroscopic properties
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Publication date
20.10.2005
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01A - Journal article
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Parent work
Aerosol Science and Technology
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Volume
39
Issue / Number
5
Pages / Duration
452-460
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Publisher / Publishing institution
Taylor & Francis
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Abstract
This article describes a submicron dust aerosol generation system based on a commercially available dust disperser intended for use in laboratory studies of heterogeneous gas–aerosol interactions. Mineral dust particles are resuspended from Arizona Test Dust (ATD) powder as a case study. The system output in terms of number and surface area is adjustable and stable enough for aerosol flow reactor studies. Particles produced are in the 30–1000 nm size range with a lognormal shape of the number size distribution. The particles are characterized with respect to morphology, electrical properties, hygroscopic properties, and chemical composition. Submicron particle elemental composition is found to be similar for the particle surface and bulk as revealed by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical emission spectroscopy (ICP-OES), respectively. A significant difference in chemical composition is found between the submicron aerosol and the ATD bulk powder from which it was generated. The anionic composition of the water-soluble fraction of this dust sample is dominated by sulfate. Resuspended dust particles show, as expected, nonhygroscopic behavior in a humid environment. Small hygroscopic growth of about 1% (relative change in mobility diameter) was observed for 100 nm particles when the relative humidity (RH) was changed from 12 to 94%. Particles larger than 100–200 nm shrank about 1% once exposed to RH > 90%. This was interpreted as a restructuring of the larger agglomerates of dust to particles of smaller mobility diameter, under the influence of water vapor.
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Subject (DDC)
550 - Geowissenschaften
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ISBN
ISSN
0278-6826
1521-7388
1521-7388
Language
English
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No
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Published
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Peer review of the complete publication
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Closed
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Citation
VLASENKO, Alexander, Staffan SJÖGREN, Ernest WEINGARTNER, Heinz W. GÄGGELER und Markus AMMANN, 2005. Generation of submicron Arizona test dust aerosol. Chemical and hygroscopic properties. Aerosol Science and Technology. 20 Oktober 2005. Bd. 39, Nr. 5, S. 452–460. DOI 10.1080/027868290959870. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46757