| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 94 === Surfactant molecules consist of hydrophobic moiety and hydrophilic moiety. In aqueous solutions, surfactant molecules aggregate to form ordered structures, such as micelle. Under proper conditions, micellar solutions can exhibit clouding phenomena and phase separate, which can be applied in extracting trace organic pollutants in water. In this work, three nonionic surfactants, such as Tergitol 15-S-5, Tergitol 15-S-7 and Tergitol 15-S-9, with molecular similarities are employed along with addition of alcohols and electrolytes to carry out preconcentration of nine kinds of phenolic compounds. The concentrations of these phenolic compounds in surfactant-rich and surfactant-lean phases after phase separation are analyzed with the HPLC equipped with UV/Vis detection. It is found that the logarithm of the distribution constants of these phenolic compounds in these two phase systems is a linear function of logarithm of their octanol-water distribution constant, namely log Kow value. This relationship provides great empirical convenience to predict the performance of surfactants in extraction and preconcentration of phenolic compounds.
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