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Permanent Gases on Rt-Msieve 5A (15 m x 0.25 mm x 20 μm)

GC_PC1349
PeakstR (min)Conc. (Mol%)
1.Helium0.58Balance
2.Argon0.883
3.Oxygen0.912
4.Nitrogen1.745
5.Methane2.344
6.Carbon monoxide7.625
ColumnRt-Msieve 5A, 15 m, 0.25 mm ID, 20 µm (cat.# 19773)
Standard/SamplePermanent gases (custom mix)
Injection
Inj. Vol.:30 µL split (split ratio 40:1)
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 (8.0 psi, 55.2 kPa)
DetectorTCD @ 200 °C
InstrumentAgilent 7890B GC
NotesResolution (Ar/O2) = 1.7
Asymmetry (CO) = 1.2

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.