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- Posts: 34
- Joined: Wed Nov 28, 2012 3:46 pm
GCMS tuning solution which contains pentachlorophenol (PCP), DFTPP, Benzidine, and 4,4'-DDT @ ~ 50µg/mL has been used as a tune check for many years. Recently, pentachlorophenol has gone missing (just isn't there) in the check on two instruments, but it's there on a third. I find it odd that this compound would disappear from two instruments at the same time.
GC columns are < 1yr old/in service, but I will change one out today and re-check regardless.
GC parameters:
HP6890 with a 5973 Mass spec
2mm focus liner packed (by me) with glass wool.
60m .25x.25 DB-5 column
Injection Port: 300C
Initial Temperature: 40C
Initial Hold: 1.0 minute
Ramp Rate #1: 6C/min
Final Temperature: 300C
Final Hold: 20 minutes
Carrier gas: Helium
Transfer Line: 300C
Detector Temperature 230°C
Quad temperature 150°C
Any ideas? Has anyone seen this before?