Page 1 of 1
gas analysis by GC
Posted: Tue Jul 16, 2013 9:30 am
by allene
Hi everyone
Can I analyze gas mixture by GC or GC-MS at concentration below 10 ppm?
GC-MS would be better or GC with TCD detector?
Any practical advice would be greatly appreciated.
Re: gas analysis by GC
Posted: Tue Jul 16, 2013 1:21 pm
by Stunt
Getting below 10ppm is possible but tricky with a TCD. As your senisitivity goes up so will your noise. Take a look at the link below for prep and analysis of methane, ethane, and ethylene.
http://www.epa.gov/region1/info/testmet ... sk-175.pdf
Re: gas analysis by GC
Posted: Tue Jul 16, 2013 2:08 pm
by rb6banjo
What are your analytes?
Re: gas analysis by GC
Posted: Tue Jul 16, 2013 2:16 pm
by CE Instruments
If you are looking at detecting gas impurities below 10ppm you should be looking at Helium ionisation detectors rather than TCD
Re: gas analysis by GC
Posted: Tue Jul 16, 2013 6:08 pm
by chromatographer1
Gow-Mac, Valco, and AIC are companies to ask questions concerning your application.
All should be able to help you get into the ppb range if necessary.
best wishes,
Rod
Re: gas analysis by GC
Posted: Sat Aug 03, 2013 3:57 pm
by tigerk2001
TCD isn't sensitive enough for accurate 0-10ppm measurement. It is better to go with ionization detector like plasma emission detector from LDetek.
You can find a good solution at
www.ldetek.com
They can offer complete micro GC solution using plasma emission detector for detecting 0-10ppm impurities. They can also offer a oem plasma detector to fit on a Lab GC.
Feel free to contact me at
dgagne@ldetek.com and I can send you some more information and references.
Regards
Dany