AICMM wrote:
frank2009,
You cannot detect He (low concentration) with H2 carrier. You can detect He with argon carrier but you might not see the CO2 (1%) in that scenario. You might need to explore two column/two detector configuration for this application.
You can choose Ar/Me as the reference and it should get you pretty close.
Best regards,
AICMM
Hello AICMM,
thank you for your advice. I'm also worrying about detecting He with H2 carrier. The firm Restek has some chromatograms regarding this issue, e.g.
https://www.restek.com/chromatogram/view/GC_PC1182 (sample concentration 1% in H2).
However, I would prefer to use Ar carrier due to the safty reason. Is it possible that you can show one chromatogram with the conditions similar to mine (TCD, Ar carrier, sample composition)? I'm not sure about the Ar/Me as the reference since my sample has CH4.
Best regards.