Chromatography Forum

Posted: **Tue Dec 13, 2011 8:49 am**

Hi,

I observed a splitting of hydrogen peak during a GC TCD analysis.The other peaks observed were for air ans carbon dioxide and were sharp continuous peaks. I am using a capillary column for GC and He is the carrier gas. Can someone reason out the cause for this split? Thanks

Jayasree

Posted: **Tue Dec 13, 2011 9:26 am**

Which column are you using? I presume the hydrogen is at a high concentration, so you can see it?

Posted: **Tue Dec 13, 2011 12:19 pm**

You are probably in the proper concentration for the infamous 'W' peak shape for hydrogen when using helium as a carrier. If your detector polarity is reversed it becomes a 'M' peak.

Change your carrier to nitrogen and see if the peak suddenly becomes one peak, and manifold times larger!

best wishes,

Rod

Chromatography Forum

Splitting of Hydrogen peak in GC TCD analysis!!!!!!!

Splitting of Hydrogen peak in GC TCD analysis!!!!!!!

Re: Splitting of Hydrogen peak in GC TCD analysis!!!!!!!

Re: Splitting of Hydrogen peak in GC TCD analysis!!!!!!!