132 Understanding Your Agilent ChemStation
6 Peak Identification
Absolute Retention/Migration Time
Absolute Retention/Migration Time
A retention/migration time window is used in the peak matching process. The
retention/migration time window is a window which is centered on the
retention/migration time for an expected peak. Any sample peak that falls
within this window may be considered as a candidate for component
identification.
Figure 30 on page 132 shows a retention/migration time window for peak 2
which is between 1.809 and 2.631 minutes where the expected
retention/migration time is 2.22 minutes. There are two possibilities for peak
2. One is at 1.85 minutes and the other at 2.33 minutes. If the expected peak is
a non-reference peak, the peak closest to the expected retention/migration
time of 2.22 minutes is selected.
If the expected peak is a time reference or internal standard, the largest peak
in the window is selected.
In both cases the ChemStation selects the peak at 2.33 minutes. If the two
peaks were the same size then the peak closest to the center of the window is
chosen.
Figure 30 Retention/Migration Time Windows
Three types of windows are used when trying to locate peaks.
• reference peak windows which apply to reference peaks only,
• non-reference peak windows which apply to all other calibrated peaks, and
• specific window values for individual components which are set in the
Compound Details dialog box.
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