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In Capillary Electrophoresis (CE) the analyte components move according to their mobility as ions in an electric field. No pump is used to move the mobile phase, although electroosmotic pressure does cause the buffer solution to move slowly through the capillary tube making Capillary Electrochromatography (CEC) possible as well using micells as a second phase. The sample is introduced by placing the front end of the capillary in an unknown solution and giving it a short burst of high voltage or just holding it up for a brief gravity feed. Detection can be by UV-Visible, as shown, with a small bare spot scraped in the covering of the hair-like capillary tube for a rather tricky short path-length UV-Visible "cell." Electrochemical and mass spectral detection are also used.
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