Method
Gas chromatograph:
Chromatec-Crystal 5000/9000
Detector:
TCD (high-sensitivity version)
Capillary columns:
CP-PoraBOND Q column, 25 m × 0.53 mm × 10 µm (with particle traps on both ends), Cat. No. CP7354PT
(precolumn for protecting the Molsieve 5A column from hydrocarbons)
CP-Molsieve 5A column, 50 m × 0.53 mm × 50 µm (with particle traps on both ends), Cat. No. CP7539PT
Injection system:
6-port Valco valve with a 0.5 mL loop
Precolumn backflush:
6-port Valco valve
Additional equipment:
Gas fittings kit 4.078.000
Method Description
We did not find a standard validated procedure for this application, but after encountering this task, we successfully developed a practical solution.
This configuration made it possible to separate two components that are particularly difficult for chromatographic analysis: argon and oxygen.
At the same time, the oxygen concentration may range from 10 ppm to 20%.
The analysis can also be performed in the presence of hydrocarbons, which creates an additional analytical challenge.