Characterization of atmospheric surfactants in the bulk precipitation by electrochemical tools
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Characterization of atmospheric surfactants in bulk precipitations was carried out by adsorption study at the mercury electrode/solution interface using phase sensitive AC voltammetry. The structure and permeability of the adsorbed organic films at the mercury electrode was tested using the redox processes of lead and cadmium ions as electrochemical tools. The effects of organic matter from the bulk precipitations (rainwater and melted snow) were compared to those obtained for aqueous solutions of model substances: aromatic hydrocarbon (naphtalene), anionic surfactant (sodium dodecylbenzene sulfonate, NDBS), protein (albumine) and selected model substances suggested to be representative of water soluble organic compounds (WSOC) in atmospheric water (monocarboxylic, dicarboxylic, and polyacidic compounds and levoglucosan). It was found that substances like humic acid and 3-hydroxybutanoic acid may play an important role in atmospheric heterogeneous chemistry because of their surface active potential.
KeywordsAC voltammetry Bulk precipitation Organic films Electrochemical tool
Financial support of the Ministry of Science, Education and Sports of Republic of Croatia for the project « Nature of organic matter, interaction with traces and surfaces in environment » is gratefully acknowledged.
We thank the referees and the Editor for their efforts and help to improve the paper.
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