期刊
ATMOSPHERIC ENVIRONMENT
卷 34, 期 28, 页码 4853-4857出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1352-2310(00)00237-5
关键词
organic aerosol; cloud chemistry; surface tension
A decrease in surface tension with respect to pure water was observed in wet aerosol and cloud/fog samples. The measured decrease of surface tension is positively correlated with the concentration of total soluble organic compounds in the samples. On the basis of a previously developed methodology to fractionate soluble organic compounds into three different classes (neutral compounds, mono- and dicarboxylic acids and polycarboxylic acids), we investigated the surface-active behaviour of the compounds within each of these classes. Polycarboxylic acids having a molecular structure analogous to that of humic substances (humic-like substances) were found to be the most effective surface-active species within the droplets: three times more effective than mono- and dicarboxylic acids and one order of magnitude more than neutral compounds. (C) 2000 Elsevier Science Ltd. All rights reserved.
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