Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions
Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water,...
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| Format: | Article |
| Language: | en_US |
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Copernicus GmbH
2015
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| Online Access: | http://hdl.handle.net/1721.1/99653 https://orcid.org/0000-0003-1851-8740 https://orcid.org/0000-0003-4234-0954 |
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| author | Zawadowicz, Maria Anna Proud, Simon R. Seppalainen, Sandra S. Cziczo, Daniel James |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Zawadowicz, Maria Anna Proud, Simon R. Seppalainen, Sandra S. Cziczo, Daniel James |
| author_sort | Zawadowicz, Maria Anna |
| collection | MIT |
| description | Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water, respectively. Field measurements have shown that atmospheric aerosols are not typically pure inorganic salt, instead, they often also contain organic species. There is ample evidence from laboratory studies that suggests that mixed particles exist in a phase-separated state, with an aqueous inorganic core and organic shell. Although phase separation has not been measured in situ, there is no reason it would not also take place in the atmosphere. Here, we investigate the deliquescence and efflorescence points, phase separation and ability to exchange gas-phase components of mixed organic and inorganic aerosol using a flow tube coupled with FTIR (Fourier transform infrared) spectroscopy. Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanetriol, 1,2-hexanediol, and 1,5-pentanediol have been investigated. Those constituents correspond to materials found in the atmosphere in great abundance and, therefore, particles prepared in this study should mimic atmospheric mixed-phase aerosol particles. Some results of this study tend to be in agreement with previous microscopy experiments, but others, such as phase separation properties of 1,2,6-hexanetriol, do not agree with previous work. Because the particles studied in this experiment are of a smaller size than those used in microscopy studies, the discrepancies found could be a size-related effect. |
| first_indexed | 2024-09-23T13:03:00Z |
| format | Article |
| id | mit-1721.1/99653 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:03:00Z |
| publishDate | 2015 |
| publisher | Copernicus GmbH |
| record_format | dspace |
| spelling | mit-1721.1/996532022-09-28T11:44:11Z Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions Zawadowicz, Maria Anna Proud, Simon R. Seppalainen, Sandra S. Cziczo, Daniel James Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Zawadowicz, Maria Anna Proud, Simon R. Seppalainen, Sandra S. Cziczo, Daniel James Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water, respectively. Field measurements have shown that atmospheric aerosols are not typically pure inorganic salt, instead, they often also contain organic species. There is ample evidence from laboratory studies that suggests that mixed particles exist in a phase-separated state, with an aqueous inorganic core and organic shell. Although phase separation has not been measured in situ, there is no reason it would not also take place in the atmosphere. Here, we investigate the deliquescence and efflorescence points, phase separation and ability to exchange gas-phase components of mixed organic and inorganic aerosol using a flow tube coupled with FTIR (Fourier transform infrared) spectroscopy. Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanetriol, 1,2-hexanediol, and 1,5-pentanediol have been investigated. Those constituents correspond to materials found in the atmosphere in great abundance and, therefore, particles prepared in this study should mimic atmospheric mixed-phase aerosol particles. Some results of this study tend to be in agreement with previous microscopy experiments, but others, such as phase separation properties of 1,2,6-hexanetriol, do not agree with previous work. Because the particles studied in this experiment are of a smaller size than those used in microscopy studies, the discrepancies found could be a size-related effect. United States. National Aeronautics and Space Administration (Earth and Space Science Fellowship) United States. National Aeronautics and Space Administration (Grant NNX13AO15G) United States. National Oceanic and Atmospheric Administration (Grant NA11OAR4310159) 2015-11-02T18:17:35Z 2015-11-02T18:17:35Z 2015-08 2015-06 Article http://purl.org/eprint/type/JournalArticle 1680-7324 1680-7316 http://hdl.handle.net/1721.1/99653 Zawadowicz, M. A., S. R. Proud, S. S. Seppalainen, and D. J. Cziczo. “Hygroscopic and Phase Separation Properties of Ammonium Sulfate/organics/water Ternary Solutions.” Atmos. Chem. Phys. 15, no. 15 (2015): 8975–8986. https://orcid.org/0000-0003-1851-8740 https://orcid.org/0000-0003-4234-0954 en_US http://dx.doi.org/10.5194/acp-15-8975-2015 Atmospheric Chemistry and Physics Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/ application/pdf Copernicus GmbH Copernicus Publications |
| spellingShingle | Zawadowicz, Maria Anna Proud, Simon R. Seppalainen, Sandra S. Cziczo, Daniel James Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title_full | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title_fullStr | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title_full_unstemmed | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title_short | Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions |
| title_sort | hygroscopic and phase separation properties of ammonium sulfate organics water ternary solutions |
| url | http://hdl.handle.net/1721.1/99653 https://orcid.org/0000-0003-1851-8740 https://orcid.org/0000-0003-4234-0954 |
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