new in the developing method - volatiles GC-MS

[Don_Hilton]

Try the split/splitless inlet. The inlet termperature and oven temperature are independent (with some limits - but not that you will encounter). My guess is that the PTV inlet was not even considered. And, the habbit I learned when doing tobacco and smoke chemistry was to use a liner with a glass wool plug unless it was demonstrated that the glass wool was not needed or got in the way. The glass wool catches a lot of non-volatile gunk and keeps it off the column. Easier to change liners than columns. If the liner stays clean after a number of injections from your samlpes, it should be fairly safe to move to a liner with a wisp of glass wool or even to a liner with no wool in it.

[dana_]

Yes, I will try with split/splitless inlet.
Thank you.

[dana_]

Hy,
I just want you to know that I manage to develop my method. The reason for the wrong results was the connection between the impingers and the smoking machine. I was using the silicon connection, and I found that silicon absorbs benzene and toluene. Now I am using PVC tubing and I have good results. I hope I will help someone with the same issue.
Thank you all for helping me!!

[Don_Hilton]

Glad to see you found a solution. And thanks for posting what you found.