Table of Contents
Advertisement
Agilent G1701EA MSD Productivity ChemStation Familiarization Guide
determine whether the match identity is correct. For
example, graphical comparison of the unknown's mass
spectrum with that of an authentic sample, knowledge of
the sample's history, and other pertinent information
should be considered.
Q.
Why does the library search list different spectra for the
same compound?
A.
Commercially available databases such as NIST or WILEY
libraries contain MSD data for instruments from several
manufacturers for one compound. This means search
results may list duplicate compounds. To avoid this
duplication, edit your Search Strategy to remove duplicate
CAS numbers. See the online help for instructions on how
to do this.
Q.
Can a compound in a spectral library be viewed manually?
A.
Yes it can. The Parametric Retrieval feature allows you to
manually specify search criteria for your spectra. It
retrieves a spectrum from the specified library based on
those criteria and displays the results. The online help
contains instructions for how to set up the criteria for your
manual search.
Q.
Can a chromatogram be redrawn to a different scale? How?
A.
There are three ways to redraw the image of a
chromatogram:
Zoom in the area of interest in the existing
•
chromatogram. Click within the area of interest and
drag the cursor to define the area for the new
chromatogram.
Using the Data Analysis menu, click Chromatogram >
•
Chromatogram Scaling... Select the chromatogram to be
rescaled, and specify the scaling method to be used.
Use the DRAW command to rescale the chromatogram
•
and define the window location of the image. Refer to
the online help for more detailed instructions on how
to perform this action.
Q.
After column maintenance or replacement, the
chromatographic peak is missing. How can the peak be
recovered?
A.
The chromatographic peak is normally determined by the
retention time window where the peak of interest would
display. After a column change or maintenance, this
retention time will shift. Perform a retention time update.
Frequently Asked Questions
13
147
Advertisement
Table of Contents
