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High performance capillary electrophoresis separation of low molecular weight compounds in biological and enviromental samples
 Oanh, Doan Thi Kieu
This dissertation thesis deals with the separation of small ions in biological and environmental samples using capillary zone electrophoresis (CZE) with capacitively coupled contactless conductivity detection (C4D). Electrodialysis (ED) was used for rapid pretreatment of inorganic cations in biological samples that contain large amounts of high molecular weight compounds that can be adsorbed on the capillary wall. In mikroED system the volume of sample needed was as low as 1 mikroL per analytical run. Using the developed system, the analysis of a single drop of whole blood was possible. Open tubular (OT) ion exchange precolumns were for the first time used for in-line sample clean-up and direct injection of biological samples into CZE. The in-line sample pretreatment method was demonstrated on determination of small inorganic cations in blood serum and blood plasma samples. Electromembrane extraction (EME) and CZE-C4D was applied to rapid and sensitive determination of perchlorate in various samples of drinking water and environmental samples.
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