Discussion
The time taken by the mobile phase to pass through the column i.e., from injector to detector is not called its :
Answer: C
It is not called the migration time.
The time an unretained substance, travelling with the mobile phase, takes to pass through a chromatographic column from injector to detector is called the dead time, also the void time or hold-up time (written \(t_{M}\) or \(t_{0}\)). It is subtracted from retention times to give adjusted retention times.
Migration time is the term used in capillary electrophoresis for the time an analyte takes to reach the detector under the electric field. So dead time, void time and hold-up time are all names for the quantity, and migration time is not.
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