Hi, I am using 6890/1888 GC and headspace sampler with chemstation b.04.01.
My calibration standards are good and linear when looking at concentrations v area. But the response factors between the different calibration levels are pretty sporadic, which means none of my samples are getting their amounts calculated properly. I ran a 250ug/mL standard and got results that were lower than anticipated (~150ug/mL & 180ug/mL for the 2 compounds). When I run samples, the values are much higher than they should be, when compared to analyses performed by a different lab.
What is the source of this and is there a way to fix without redoing every standard? (I have 40 calibrations standards)