I'm having some problem with my method.
Not sure exactly what it is:
Couple of days ago I've replaced the column of my GC-6850 with a shorter column ( 30m - 320mm).
I had to integrate the peaks with the new length of the column.
I normally use two methods to run my samples:
One is longer (ramp) and the other one is shorter with no ramp.
I can calibrate the longer method with no problems.
But when i load the shorter method it is not possible to calibrate the machine.
I've noticed that when I run a blank test (no injection) on short method it picks up the compound that I'm analyzing.
When I run the same Blank on longer method the peak disappears.
Standard Run (104ppb)
Blank Run (no injection)
I'm afraid that I've got a contamination and the peak on short run is not correctly integrated.
Sorry I can't explain better.
I'm very new in this field and I'm looking for some help in trying to understand better my software.