Permanent Gases on Rt-Msieve 5A (15 m x 0.53 mm x 50 μm)

PeakstR (min)Conc. (Mol%)
1.Helium0.63Balance
2.Argon0.943
3.Oxygen0.972
4.Nitrogen1.845
5.Methane2.464
6.Carbon monoxide8.115
image
GC_PC1347
ColumnRt-Msieve 5A, 15 m, 0.53 mm ID, 50 µm (cat.# 19721)
SamplePermanent gases (custom mix)
Injection
Inj. Vol.:30 µL split (split ratio 10:1)
Liner:Topaz 2.0 mm ID straight inlet liner (cat.# 23313)
Inj. Temp.:150 °C
Oven
Oven Temp.:30 °C (hold 10 min)
Carrier GasH2, constant pressure (1.7 psi, 11.7 kPa)
DetectorTCD @ 200 °C
InstrumentAgilent 7890B GC
NotesResolution (Ar/O2) = 1.4
Asymmetry (CO) = 1.1

Note that the sample was introduced onto the column using syringe injection and a high split ratio, which results in a very narrow sample band. Any dead volume in the system (e.g., from using a sampling valve, large sampling loops, or even from using splitless injection) will result in peak broadening, which might decrease resolution between the peaks or even result in peak coelution.
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