Revision 4
60
12/15/2018
5.4 Chromatographic Parameters
5.4.1 General Parameters
The
Component Table
(Figure 5-4) lists each of the compounds to be analyzed for and
includes chromatographic data to identify and quantitate them.
Figure 5-4: Component Table
The
Component Table
contains the following:
•
Component Name - the name of the compound to be quantified.
Do not edit the names of the components.
•
Calibration Gas Concentration - the concentration of each component found in the
calibration gas. These values are typically provided by the supplier of the calibration gas via
a certificate included with the gas cylinder.
•
Retention Time - the time (in seconds) at which the maximum signal from the detection of
the given component is observed by the detector. Peaks in a chromatogram are identified
on the basis of their retention times as each component has its own unique retention time.
It is suggested that this data be taken as the average of the retention time from at least
three chromatographic runs.
•
Retention Time Window - the amount of time (in seconds) that a peak is allowed to deviate
from the indicated retention time for a given component and still be identified as that
component. If, for example, methane has a retention time of 25.95 seconds and a deviation
of 5 seconds is allowed, a peak with a retention time anywhere between 21.95 seconds and
31.95 seconds will be identified as methane. Generally speaking, peaks that elute early in
the analysis will have small retention time deviations (± 5 seconds or less), while later peaks
will have larger deviations (± 10 seconds or more).
•
Response Factor – a multiplication factor that converts a raw peak area into a concentration
value. When the system is in calibration mode the analyzer will measure several runs of the
calibration standard to calculate the average response factor. The response factor is used
to calculate the concentration of the components in a run as shown in equation 5-1.
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