VINYL CHLORIDE different area with GC-FID

Hello,
I am trying to create method for vinly chloride in MeOH (GC-FID) and i did it but disturbing is that with every next inj peak area of VC is lower (on the same method's parameters).
First inj area is about 200, next 180, next 150... FOR THE SAME CONCENTRATION. Thinking

Method is short - it has only about 4,5 min. I know that VC is volatile but maybe is also another reason? Have anybody any solution for that problem? :)

Parents Reply
  • ok, i will do it.

    Septa i think is ok, it was not long ago changed but to eliminate it - i will try:)

    Few days ago i was looking at liner - it mean i used septa nur so maybe there is problem? but i know that some times ago (beginning of the year) i also try with VC and problem was the same. 

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