gas analysis by GC

[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.

[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

[rb6banjo]

What are your analytes?

[CE Instruments]

If you are looking at detecting gas impurities below 10ppm you should be looking at Helium ionisation detectors rather than TCD

[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

[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