Hygroscopic growth and water uptake kinetics of two-phase aerosol particles consisting of ammonium sulfate, adipic and humic acid mixtures

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Authors
Sjögren, Staffan
Baltensperger, Urs
Cubison, Michael J.
Coe, Hugh
Zardini, Alessandro A.
Marcolli, Claudia
Krieger, Ulrich K.
Peter, Thomas
Author (Corporation)
Publication date
02/2007
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01A - Journal article
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Parent work
Journal of Aerosol Science
Special issue
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Volume
38
Issue / Number
2
Pages / Duration
157-171
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Publisher / Publishing institution
Elsevier
Place of publication / Event location
Amsterdam
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Abstract
The hygroscopic growth of solid aerosol particles consisting of mixtures of ammonium sulfate and either adipic acid or Aldrich humic acid sodium salt was characterized with a hygroscopicity tandem differential mobility analyzer and an electrodynamic balance. In particular, the time required for the aerosol particle phase and the surrounding water vapor to reach equilibrium at high relative humidity (RH) was investigated. Depending on the chemical composition of the particles, residence times of > 40 s were required to reach equilibrium at 85% RH, yielding up to a 7% reduction in the measured hygroscopic growth factors from measurements at 4 s residence time compared to measurements at equilibrium. We suggest that the solid organic compound, when present as the dominant component, encloses the water-soluble inorganic salt in veins and cavities, resulting in the observed slow water uptake. Comparison with predictions from the Zdanovskii-Stokes-Robinson relation shows enhanced water uptake of the mixed particles. This is explained with the presence of the salt solution in veins resulting in a negative curvature of the solution meniscus at the opening of the vein. In conclusion, it is important for studies of mixtures of water soluble compounds with insoluble material to allow for sufficient residence time at the specified humidity to reach equilibrium before the hygroscopicity measurements.
Keywords
Subject (DDC)
550 - Geowissenschaften
610 - Medizin und Gesundheit
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0021-8502
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
SJÖGREN, Staffan, Martin GYSEL, Ernest WEINGARTNER, Urs BALTENSPERGER, Michael J. CUBISON, Hugh COE, Alessandro A. ZARDINI, Claudia MARCOLLI, Ulrich K. KRIEGER und Thomas PETER, 2007. Hygroscopic growth and water uptake kinetics of two-phase aerosol particles consisting of ammonium sulfate, adipic and humic acid mixtures. Journal of Aerosol Science. Februar 2007. Bd. 38, Nr. 2, S. 157–171. DOI 10.1016/j.jaerosci.2006.11.005. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46711