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Anionic, Cationic, ...
Anionic, Cationic, and Nonionic Surfactants in Atmospheric Aerosols from the Baltic Coast at Asko, Sweden : Implications for Cloud Droplet Activation
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- Gérard, Violaine (författare)
- Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), CNRS, and Université Lyon 1, Villeurbanne, 69626 France
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- Nozière, Barbara (författare)
- Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), CNRS, and Université Lyon 1, Villeurbanne, 69626 France
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- Baduel, Christine (författare)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Departmentof Applied Environmental Science (ITM), Stockholm University, Stockholm 106 91, Sweden
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- Fine, Ludovic (författare)
- Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), CNRS, and Université Lyon 1, Villeurbanne, 69626 France
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- Frossard, Amanda A. (författare)
- Departmentof Chemistry, University of California, Berkeley 94720, United States
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- Cohen, Ronald C. (författare)
- Departmentof Chemistry, University of California, Berkeley 94720, United States;Departmentof Earth and Planetary Science, University of California, Berkeley 94720, United States
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(creator_code:org_t)
- 2016-03-03
- 2016
- Engelska.
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Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 50:6, s. 2974-2982
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Recent analyses of atmospheric aerosols from different regions have demonstrated the ubiquitous presence of strong surfactants and evidenced surface tension values, sigma, 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 Asko, Sweden, from July to October 2010. Strong surfactants were found in all the sampled aerosols, with sigma = (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 (R-2 similar to 0.7) between aerosol surfactant concentrations and chlorophyll-a seawater concentrations suggest a marine and biological origin for these compounds.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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