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9
10 Enter the recorded retention time in the Holdup Time field. Move the cursor
11 Click OK to save the changes and exit the dialog.
12 Click OK on the Calibrate Columns dialog to save the calibration.
With capillary columns, such as those used with the MSD, linear velocity is
often measured rather than volumetric flow rate.
Calculation for average linear velocity
Calculation for volumetric flow rate
5975/5977 Series MSD Operation Manual
Verify that the parameters listed (temperature, inlet and outlet pressures,
and gas type) are those used in the method to determine the holdup time.
Change any parameters that are different than those used in your method.
to another parameter's field and the calibrated column length appears.
Average linear velocity (cm/s)
where:
L = Length of the column in meters
t = Retention time in seconds
Volumetric flow rate (mL/min) =
where:
D = Internal column diameter in millimeters
L = Column length in meters
t = Retention time in minutes
Operating in Electron Ionization (EI) Mode
100 L
------------- -
=
t
2
0.785 D
L
--------------------------- -
t
3
73
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