Label peaks with m/z values

Preparations

• An MS signal with SCAN, SIM/SCAN, or GC/MS SIM data is available.

• As for any peak labeling, peaks must have been integrated first.

• If you use UV data: You aligned UV and MS signals (see Align MS and UV chromatograms). The retention times of UV peaks and matching MS peaks must fall within 0.01 min.

• If you label identified peaks and use UV data: Compounds must be defined for both MS and UV signal in the processing method.

1. In the Chromatograms tab, click to open the Chromatogram Properties.

2. Select the Annotations page.

   

3. Select the check box to annotate identified or not identified peaks.

4. In the drop-down list, choose MS Base Peak m/z, and select the corresponding Use check box. Use prefix or suffix information as required.

5. Confirm your settings, and reprocess the data.

   The m/z values are added to the peaks in the chromatogram.

   

   For peaks in TIC and UV chromatograms, the displayed m/z value is the most abundant ion of the corresponding MS spectrum. MS spectra are either extracted from the peak apex or averaged over the time range of the peak (for more information, see Processing method: Extraction: Spectrum (MS tab))