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Title: Hygroscopic Properties of Internally Mixed Particles Composed of NaCl and Water-Soluble Organic Acids

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 and X-ray elemental microanalysis.Hygroscopic properties of inte rnally 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 Na-malonate and Na-glutarate salts resulted by HCl evaporation from dehydrating particles.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1127290
Report Number(s):
PNNL-SA-99124
44638
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Environmental Science & Technology, 48(4):2234-2241
Additional Journal Information:
Journal Name: Environmental Science & Technology, 48(4):2234-2241
Country of Publication:
United States
Language:
English
Subject:
Hygroscopic Properties; micro-FTIR; internally mixed particles; chloride depletion; Environmental Molecular Sciences Laboratory

Citation Formats

Ghorai, Suman, Wang, Bingbing, Tivanski, Alexei V., and Laskin, Alexander. Hygroscopic Properties of Internally Mixed Particles Composed of NaCl and Water-Soluble Organic Acids. United States: N. p., 2014. Web. doi:10.1021/es404727u.
Ghorai, Suman, Wang, Bingbing, Tivanski, Alexei V., & Laskin, Alexander. Hygroscopic Properties of Internally Mixed Particles Composed of NaCl and Water-Soluble Organic Acids. United States. https://doi.org/10.1021/es404727u
Ghorai, Suman, Wang, Bingbing, Tivanski, Alexei V., and Laskin, Alexander. 2014. "Hygroscopic Properties of Internally Mixed Particles Composed of NaCl and Water-Soluble Organic Acids". United States. https://doi.org/10.1021/es404727u.
@article{osti_1127290,
title = {Hygroscopic Properties of Internally Mixed Particles Composed of NaCl and Water-Soluble Organic Acids},
author = {Ghorai, Suman and Wang, Bingbing and Tivanski, Alexei V. and Laskin, Alexander},
abstractNote = {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 and X-ray elemental microanalysis.Hygroscopic properties of inte rnally 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 Na-malonate and Na-glutarate salts resulted by HCl evaporation from dehydrating particles.},
doi = {10.1021/es404727u},
url = {https://www.osti.gov/biblio/1127290}, journal = {Environmental Science & Technology, 48(4):2234-2241},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 18 00:00:00 EST 2014},
month = {Tue Feb 18 00:00:00 EST 2014}
}