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Recoveries of Light Gases

Posted: Wed Dec 09, 2015 7:05 pm
by White Rabbit
We have a problem with the recovery of light gases. Acetylene, Ethane, Ethylene and sometimes Propane. Since we use response factor from propane for all the targets on the PLOT column if the recovery is lower than it's supposed to be then the recoveries for C4 and C5 gases is higher than expected. Has anyone seen this? Know what causes it?

Re: Recoveries of Light Gases

Posted: Sat Dec 19, 2015 10:12 am
by Red Queen
Losses of acetylene and ethane can be a result of trap break though. If the sample volume is too high (e.g. sample flow too high or sample interval too long) then these light gases will be lost off the trap. Even at -30C these light gases migrate through the trap material so they can be lost off the trap if the flow and time is too great.