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Hydrotropes are a class of compounds that, at a hig h concentration, enhance the solubility of a variety of hydrophobic compounds in water. The main property of the hydrotropes is related to the MCH (minimum hydrotro pic concentration) at which hydrotropes start to aggregate. In this work, a series of aromatics compounds that s owed hydrotropic effects is used: sodium xylenesulfonate, sodium salicylate, sodium p -toluenesulfonate, sodium benzoate and sodium styrenesulfonate. Different techniques were used to evaluate the MHC , like as: conductivity, surface tension, light scattering, viscosity and fluorescen ce. The fluorescence spectroscopy was used to determine the MHC by external and internal probe ; th moiety phenyl of compounds ring served as the internal fluorescence probe. Intensit i s of the monomer and excimer contributions (I aggr/Imonomol ) were determined and the pyrene was used as extern al p obe measuring the ratio of intensities I 1/I3. It is shown that MHC values determined by different methods agree well. The method based on the aggregate to monomol emission ratio sh owed advantages when compared to the other method, because it doesn’t require the use of probes or other additives, which might disrupt the aggregation process.

Determinação da concentração hidrotrópica mínima de hidrótropos aromáticos