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Agilent G1701EA MSD Productivity ChemStation Familiarization Guide
A.
There are two possible reasons. First, incorrect integration
events may be used for quantitation. To check this, open
the Edit Compound dialog with Calibration >Edit
Compound....Select the compound of interest on the left
panel. Click the Advanced tab to show the Integration
Parameter File being used. The second cause may be that
the concentration of the peak was lower than the
quantitation limit. Integration parameters are set to
integrate at least the lowest concentration standard
sample peak. The area reject or other event may restrict
small peaks from being integrated. In this case, the peak is
lower than the quantitation limit; therefore, N.D. is
appropriate. Please refer to the online help for additional
information.
Q.
Why does the quantitated data file show different results
for the qualifier ion ratio?
A.
The qualifier ion ratio on the first page of the quantitation
database is calculated using the abundance of the qualifier
ion relative to the abundance of the target ion when the
compound was registered (=abundance ratio). The
qualifier ion ratio can also be calculated using the
integration of the spectrum (area of the curve) of the
qualifier ion relative to the integration of the target ion
spectrum (=area ratio). You can specify which way you
would like the qualifier ion ratio to be calculated. See the
online help for instructions.
Frequently Asked Questions
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