We currently use Agilent 7890A GC with S/SL injector and FID detector using a capillary column for the analysis of crude oil composition upto C35. The remaining compounds will be reported as C36+. The temperature program is from 30 Deg to 325 Deg, We run a few blanks before injecting crude oil sample for subtracting the baseline. Because of the heavy ends in the samples, we never get consistent baseline for the blank. Is there a better configuration for this type of analysis. Currently we replace the columns very frequently.
Do we need to replace the S/SL injector with any other type?
Is it possible to have a pre-column and additional EPC to backflush the heavy ends beyond C35?
Please look into the matter and provide an alternative.