retention time

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retention time (ta)

1 (in chromatography) the amount of time elapsed from the injection of a sample into the chromatographic system to the recording of the peak (band) maximum of the component in the chromatogram.
2 the length of time a compound is retained on a chromatography column.

retention time,

n the amount of time it takes for a vaporized compound to pass through the column in chromatography.