Good morning everyone,
I am measuring some 'dirty' samples (flavour products) over a couple of days to measure impurities.
Every day I am creating a new calibration curve and injecting a couple of samples.
I am noticing that every day the signal of my calibration standard is lower than the day before.
My question is what could be causing this loss of signal, and how can i fix it?
7890B GC with a 5977B single quad MSD
Max temperature: 240 (20C below column max)
Result for highest standard, in areas:
Day 1 100.000
Day 2 85.000
Day 3 70.000
Thanks in advance,