I performed Gas chromatography for mixture of gases (hydrogen, methane and carbon dioxide) using the following conditions: Nitrogen as carrier gas, injector temperature - 50 degree celsius, and detector - 120 degree celsius. The peaks generated are positive for hydrogen and methane, but negative for carbondioxide. Kindly state the reason for the above issue.
William Letter
When discussing GC methods, please share basic GC conditions for your method in your post.
- Your question relates to response. What type of GC detector are you using ?
- The method conditions (temperature ramp/times) for your GC method are ?
- What are the GC column dimensions?
- What is the gas flow rate used for your method?
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Humberto Gomez-Ruiz
It depends on the detector you are using, usually with TC detectors produce negative peaks when thermal conductivity is less than that of the carrier
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Abdullahi Olabintan
The negative peak might arise from the contamination of your carrier gas. Try to use pure helium as your carrier gas.
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