Retention Time

The retention time is used for peak identification. The Retention Time peak variable refers to the elapsed time (in minutes) since the injection (also, refer to Dead Time). The retention time of a peak is defined by the time of the data point with the highest response value (the peak maximum). (This does not have to be the data point with the largest distance to the baseline.)

In Chromeleon, the retention time is especially important at two points:

QNT Editor

On the Peak Table page in the QNT Editor, the retention time can be entered either manually by the user or automatically by the system.

Also, refer to Response Factor

Report

In contrast to the QNT Editor, the actually measured retention times of the corresponding samples are stated in the report. This is the default setting for the Retention Time variable of the Peak Results category. With this variable, it is also possible to indicate the actual nominal retention time. Then, the settings of Use Recently Detected Retention Times are taken into account.

However, it is also possible to include the expected retention times (from the peak table of the QNT Editor) using the Peak Table category. Select the Retention Time variable from the Peak Table report category. It is not always the nominal retention time that is displayed.