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Surface tension of solutions containing dicarboxylic acids with ammonium sulfate, d-glucose, or humic acid
Ist Teil von
Journal of aerosol science, 2013-10, Vol.64, p.94-102
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2013
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
To examine the effect of organic/inorganic solutes on the properties of cloud condensation nuclei and other atmospheric aerosols, the surface tension of various mixtures including dicarboxylic acids, ammonium sulfate, d-glucose, and humic acid sodium salt (NaHA) was measured at 20°C using the Wilhelmy plate method. An equimolar mixture of oxalic/malonic acids (0–0.5mol/kg water) was added to ammonium sulfate (0.1–3mol/kg water), d-glucose (0.01–2mol/kg water), and NaHA (0.1–10g/kg water) solutions. The surface tensions of ammonium sulfate, d-glucose, and NaHA solutions decreased as the concentration of the added oxalic/malonic acid mixture increased. The trend in surface tension for the ammonium sulfate solution is roughly similar with and without the addition of the oxalic/malonic acid mixture. However, the surface tension trend for the d-glucose and NaHA solutions with the oxalic/malonic acid mixtures does not follow that of pure d-glucose and NaHA solutions. With the presence of oxalic/malonic acids in the solution, the surface tension increase by d-glucose becomes larger and the surface tension reduction by NaHA becomes smaller.
•Surface tension of various organic mixtures was measured using the Wilhelmy plate method.•Surface tension trend for (NH4)2SO4 does not depend on dicarboxylic acids in solutions.•Surface tension trend for d-glucose depends on oxalic/malonic acids in solutions.•Surface tension trend of NaHA mixtures does not follow that of pure NaHA solution.