Elektrokinetická chromatografie v nevodných a směsných rozpouštědlech: Stanovení kritické micelární koncentrace

Hamráková, Katarína

This thesis deals with the investigation of micelle formation following the addition of a surfactant to a background electrolyte in micellar electrokinetic chromatography and the transfer of these systems to nonaqueous and mixed solvents. The addition of organic solvents to the background electrolyte has a significant effect onmicelle formationandhence separation in electrokinetic chromatographyusinga micellar pseudo-stationaryphase. This effect has not yet been studied in depth. Information on the presence and properties of micelles in a given separation system is important for the understanding of separation processes but also for the development and optimization of analytical methods. In this work, the critical micellar concentration (CMC) of two surfactants, sodium dodecyl sulfate (SDS) and cetyltrimethylammoniumbromide (CTAB), was determinedby introducingthem into a mixed environment with non-aqueous solvents, acetonitrile and methanol. The critical micellar concentration was determined from the dependence of three variables on the surfactant concentration in the solution, namely, the effective mobility of the analytes and the viscosity and conductivity of the solution. Prior to the actual measurements of the effective mobility of the analytes, suitable analytes were selected,two which can...

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