Agriculture Reference
In-Depth Information
Poles
Ionizing
electron beam
Ion
collector
dc and RF voltages
Sample
beam
Sample input from
chromatograph
Figure 9.5.
Diagram of quadrupole MS used as detector for gas chromatography.
R
t
1
Time (min)
Figure 9.6.
Gas chromatograph of soil air taken in Figure 9.7.
R
t
is the time it takes the first peak
to come out.
R
t
values can be found for all peaks if needed.
air can easily be analyzed using gas chromatography. A gas chromatograph of
the soil air in a container with wheat growing in it is shown in Figure 9.6. A
sample of the soil air for this analysis was obtained by simply inserting a small
Phillips head screwdriver into the soil to make an access hole for a syringe
needle. The syringe needle is then inserted into the hole and the plunger with-
