2.3. Quantitative Analysis
In a GC chromatogram, the size and area of the component peak are proportional to the amount of the component reaching the detector.
Here, we describe a quantitative analysis investigating the concentration of component A in an unknown sample.
First, 1 μL of the unknown sample is analyzed, and the area of the peak for component A in the chromatogram obtained has a count of 700.
Next, a standard sample is prepared with a concentration of component A of 100 ppm. 1 μL of this is analyzed under the same conditions, and a count of 1000 is obtained as the peak area.
The peak area is proportional to the amount of the component, so if a 100 ppm concentration has a count of 1000, a 700 count means a 70 ppm concentration.
As with qualitative analysis, one could say that a standard sample is also required for quantitative analysis.
The area (height) of the component peak is proportional to the amount of component reaching the detector.
(Note: In FPD S mode, it is proportional to the square of the component amount.)
A standard sample is also required for quantitative analysis.