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
  • ok, i did it for lower concentration which I did today (on split 10:1 results was from 26 to 14) and ... 

    split 35:1 --> 1st inj: 2,32; 2nd inj: 1,82 (same problem..), solvent peak - methanol - was also smaller 

    split 5:1 --> 1st inj: 7,82; 2nd inj: 5,94, solvent peak also bigger. But there i should have results buigger then on split 10:1.. ehh what's going onnnn 

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