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GC/MS Loss of signal over time

Question asked by koos on Apr 11, 2018
Latest reply on Apr 18, 2018 by koos

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?


Some information:

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,