electro-osmotic hold-up time, t eo in capillary electromigration, in capillary electromigration

Time required for a liquid in a capillary to move due to electro-osmosis through the effective length of the capillary, L eff. This time is usually measured as the migration time of a neutral compound, called an electro-osmotic flow marker which is assumed to have an electro-osmotic mobility that is negligible compared to that of the analyte.
PAC, 2004, 76, 443 (Terminology for analytical capillary electromigration techniques (IUPAC Recommendations 2003)) on page 447