Journal article
Hygroscopic properties of internally mixed particles composed of NaCl and water-soluble organic acids
Environmental science & technology, Vol.48(4), pp.2234-2241
02/18/2014
DOI: 10.1021/es404727u
PMID: 24437520
Abstract
Atmospheric aging of naturally emitted marine aerosol often leads to formation of internally mixed particles composed of sea salts and water-soluble organic compounds of anthropogenic origin. Mixing of sea salt and organic components has profound effects on the evolving chemical composition and hygroscopic properties of the resulted particles, which are poorly understood. Here, we have studied chemical composition and hygroscopic properties of laboratory generated NaCl particles mixed with malonic acid (MA) and glutaric acid (GA) at different molar ratios using micro-FTIR spectroscopy, atomic force microscopy, and X-ray elemental microanalysis. Hygroscopic properties of internally mixed NaCl and organic acid particles were distinctly different from pure components and varied significantly with the type and amount of organic compound present. Experimental results were in a good agreement with the AIM modeling calculations of gas/liquid/solid partitioning in studied systems. X-ray elemental microanalysis of particles showed that Cl/Na ratio decreased with increasing organic acid component in the particles with MA yielding lower ratios relative to GA. We attribute the depletion of chloride to the formation of sodium malonate and sodium glutarate salts resulted by HCl evaporation from dehydrating particles.
Details
- Title: Subtitle
- Hygroscopic properties of internally mixed particles composed of NaCl and water-soluble organic acids
- Creators
- Suman Ghorai - Department of Chemistry, The University of Iowa , Iowa City, Iowa 52242, United StatesBingbing WangAlexei TivanskiAlexander Laskin
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.48(4), pp.2234-2241
- Publisher
- United States
- DOI
- 10.1021/es404727u
- PMID
- 24437520
- ISSN
- 0013-936X
- eISSN
- 1520-5851
- Language
- English
- Date published
- 02/18/2014
- Academic Unit
- Chemistry
- Record Identifier
- 9983985828002771
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