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首页> 外文期刊>Environmental Science & Technology >Anionic, Cationic, and Nonionic Surfactants in Atmospheric Aerosols from the Baltic Coast at Askoe, Sweden: Implications for Cloud Droplet Activation
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Anionic, Cationic, and Nonionic Surfactants in Atmospheric Aerosols from the Baltic Coast at Askoe, Sweden: Implications for Cloud Droplet Activation

机译：来自瑞典Askoe的波罗的海沿岸大气气溶胶中的阴离子，阳离子和非离子表面活性剂：对云滴活化的影响

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摘要

Recent analyses of atmospheric aerosols from different regions have demonstrated the ubiquitous presence of strong surfactants and evidenced surface tension values, σ_1 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 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 (R~2 ～ 0.7) between aerosol surfactant concentrations and chlorophyll-α seawater concentrations suggest a marine and biological origin for these compounds.
机译：最近对来自不同地区的大气气溶胶的分析表明，普遍存在强表面活性剂，并且表面张力值σ_1低于40 mN m〜（-1），被怀疑会增强这些气溶胶的成云潜力。在这项工作中，该方法得到了进一步改进，并通过比色滴定法与气溶胶表面活性剂的绝对浓度测量相结合。该分析适用于2010年7月至10月在瑞典阿斯科的波罗的海站收集的PM2.5气溶胶。在所有采样的气溶胶中均发现了强表面活性剂，σ=（32-40）±1 mN m〜（- 1）且浓度至少为27±6 mM或104±21 pmol m〜（-3）。对这些气溶胶表面活性剂测定的绝对表面张力曲线和临界胶束浓度（CMC）显示：（1）表面活性剂在大气颗粒中的浓度足以强烈抑制表面张力直至活化，并且（2）表面张力不遵循Szyszkowski在激活过程中，方程几乎是恒定且最小的，这为云滴激活提供了新的见解。另外，测定的CMCs和气溶胶表面活性剂浓度与叶绿素-α海水浓度之间的相关性（R〜2〜0.7）都表明这些化合物具有海洋和生物起源。

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  • 来源
    《Environmental Science & Technology》 |2016年第6期|2974-2983|共10页
  • 作者

    Violaine Gerard; Barbara Noziere; Christine Baduel; Ludovic Fine; Amanda A. Frossard; Ronald C. Cohen;

  • 作者单位

    Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS, and Universite Lyon 1, Villeurbanne, 69626 France;

    Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS, and Universite Lyon 1, Villeurbanne, 69626 France;

    Department of Applied Environmental Science (ITM), Stockholm University, Stockholm 106 91, Sweden,National Research Center for Environmental Toxicology, The University of Queensland, Brisbane, Australia;

    Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS, and Universite Lyon 1, Villeurbanne, 69626 France;

    Department of Chemistry, University of California, Berkeley 94720, United States;

    Department of Chemistry, University of California, Berkeley 94720, United States,Department of Earth and Planetary Science, University of California, Berkeley 94720, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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