Abstract
During a zone electrophoretic analysis, components can migrate in the isotachophoretic mode. If, for example in anionic separation in capillary zone electrophoresis an anion with a high effective mobility is present in the sample at a very high concentration, it migrates forwards into the background electrolyte, separates from the other components and forms an isotachophoretic system with two leading ions together with the anion of the background electrolyte. Some of the sample components will therefore migrate in the isotachophoretic mode for the greater part of the analysis time. Because in the isotachophoretic mode the zone lengths are constant, very small sample zone lengths will give extremely high plate numbers. Of course, migration times will vary strongly depending on the composition of the sample.
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