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Permanent Gases on Capillary Rt-MSieve 5A

PeakstR (min)Conc. mol %
1.Hydrogen1.3584
2.Argon1.9763
3.Oxygen2.0282
4.Nitrogen3.5285
5.Methane4.7554
6.Carbon monoxide12.4995
image
GC_PC1331
ColumnRt-Msieve 5A, 30 m, 0.32 mm ID, 30 µm (cat.# 19722)
SamplePermanent gas standard
Diluent:Helium
Injection
Inj. Vol.:50 µL split (split ratio 20:1)
Liner:Topaz 2.0 mm ID straight inlet liner (cat.# 23313)
Inj. Temp.:150 °C
Oven
Oven Temp.:40 °C (hold 13 min)
Carrier GasHe, constant flow
Flow Rate:2.5 mL/min
DetectorTCD @ 200 °C
Make-up Gas Flow Rate:10 mL/min
Make-up Gas Type:He
InstrumentAgilent 7890B GC
NotesBaseline resolution between argon and oxygen is obtained using split injection. (R(Ar/O2) = 1.8)

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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