What are the commonly used carrier gases in GC analysis when using FID detector?

2013-09-24 14:01:12 liting

Inert gases commonly used in analysis when using FID detector are Nitrogen and Helium. Nitrogen is more commonly used as it is less expensive than Helium. Purity of carrier gas should be more than 99.995% and on-line traps should be used to prevent residual moisture or other impurities from entering the system.