VINYL CHLORIDE different area with GC-FID

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
  • Now data what you are showing is that area is around 300..

    It's not giving difference of 50 or 40.

    Condition column.

    Throw all waste of waste vial from autoinjector.

    Put new solvent in wash vial if you are using.

    Hope,  then you will get more precise result 

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