Anionic, cationic, and nonionic surfactants in atmospheric aerosols from the Baltic coast at Askö, Sweden: implications for cloud droplet activation

Gerard, Violaine, Noziere, Barbara, Baduel, Christine, Fine, Ludovic, Frossard, Amanda A. and Cohen, Ronald C. (2016) Anionic, cationic, and nonionic surfactants in atmospheric aerosols from the Baltic coast at Askö, Sweden: implications for cloud droplet activation. Environmental Science and Technology, 50 6: 2974-2982. doi:10.1021/acs.est.5b05809


Author Gerard, Violaine
Noziere, Barbara
Baduel, Christine
Fine, Ludovic
Frossard, Amanda A.
Cohen, Ronald C.
Title Anionic, cationic, and nonionic surfactants in atmospheric aerosols from the Baltic coast at Askö, Sweden: implications for cloud droplet activation
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 1520-5851
0013-936X
Publication date 2016-03-15
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.est.5b05809
Open Access Status Not Open Access
Volume 50
Issue 6
Start page 2974
End page 2982
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract Recent analyses of atmospheric aerosols from different regions have demonstrated the ubiquitous presence of strong surfactants and evidenced surface tension values, σ, below 40 mN m, suspected to enhance the cloud-forming potential of these aerosols. In this work, this approach was further improved and combined with absolute concentration measurements of aerosol surfactants by colorimetric titration. This analysis was applied to PM2.5 aerosols collected at the Baltic station of Askö, Sweden, from July to October 2010. Strong surfactants were found in all the sampled aerosols, with σ = (32-40) ± 1 mN m and concentrations of at least 27 ± 6 mM or 104 ± 21 pmol m. The absolute surface tension curves and critical micelle concentrations (CMC) determined for these aerosol surfactants show that (1) surfactants are concentrated enough in atmospheric particles to strongly depress the surface tension until activation, and (2) the surface tension does not follow the Szyszkowski equation during activation but is nearly constant and minimal, which provides new insights on cloud droplet activation. In addition, both the CMCs determined and the correlation (R ∼ 0.7) between aerosol surfactant concentrations and chlorophyll-a seawater concentrations suggest a marine and biological origin for these compounds.
Formatted abstract
Recent analyses of atmospheric aerosols from different regions have demonstrated the ubiquitous presence of strong surfactants and evidenced surface tension values, σ, below 40 mN m–1, suspected to enhance the cloud-forming potential of these aerosols. In this work, this approach was further improved and combined with absolute concentration measurements of aerosol surfactants by colorimetric titration. This analysis was applied to PM2.5 aerosols collected at the Baltic station of Askö, Sweden, from July to October 2010. Strong surfactants were found in all the sampled aerosols, with σ = (32–40) ± 1 mN m–1 and concentrations of at least 27 ± 6 mM or 104 ± 21 pmol m–3. The absolute surface tension curves and critical micelle concentrations (CMC) determined for these aerosol surfactants show that (1) surfactants are concentrated enough in atmospheric particles to strongly depress the surface tension until activation, and (2) the surface tension does not follow the Szyszkowski equation during activation but is nearly constant and minimal, which provides new insights on cloud droplet activation. In addition, both the CMCs determined and the correlation (R2 ∼ 0.7) between aerosol surfactant concentrations and chlorophyll-a seawater concentrations suggest a marine and biological origin for these compounds.
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 2009-224
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
National Research Centre for Environmental Toxicology Publications
 
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