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Green House Gases CO2, CH4, N2O, HFCs, PFCs and SF6 Analyzer
Posted: Tue Jun 03, 2008 4:17 pm
by kan
The concentration interested is in ppb level. Can a GC with combination of PDID, TCD and ECD able to perform the job with special plumbing and valving? Normally CH4 concentration will be higher than others. Please indicate what is the maximum level.
If the maximum concentration is in ppm level, is it possible running with a GC with PDID and ECD detector only?
Please share if you have different idea of doing the job.
Tx
Posted: Sat Jun 07, 2008 12:57 pm
by kan
It can be done with PDID and ECD detector for low detection limit up to 100 ppb. TCD is for concentration in %.
PDID is able to detect SF6, CH4, CO2 and N2O while ECD detects the halogenated compounds.
Anyone can tell me normally what is the CH4 percentage can be found in greenhouse gas? Less than 2000ppm?
Posted: Mon Jun 09, 2008 10:29 pm
by AICMM
Kan,
With the appropriate column selections, you should be able to do all of these at ppm or sub-ppm levels using just the PDD. The problem is going to be getting them all out in a reasonable amount of time and to the detector. If you have two detectors then you could divide the problem and conquer it more efficiently. Remember that the ECD will have very poor sensitivity for hydrocarbons that have only one chlorine on them so that may not be a great choice. ECD should work great for the SF6 though.
Best regards.