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- Posts: 1
- Joined: Wed Oct 25, 2006 6:13 pm
Hello everyone - frequent visitor, first time poster.
I'm currently running EPA Method 8270 (SemiVolatile Organics) on a HP MS 5973/ GC 6890.
The other day I changed the column and performed some source body maintence and replaced my filaments. This morning I ran an autotune, saved my tune and began to run my calibration curve, starting with the DFTPP tune.
My DFTPP, as required by the State of Michigan, contains DFTPP, Benzidine, Pentachlorophenol and DDT. While I was able to pass DFTPP with no problem, and my Benzidine tailing factor was well within range and my DDT breakdown was minimal, the Pentachlorophenol chromatography was extremely choppy - as if it did n't scan enough.
Upon further inspection of my DFTPP method, it was determined that I was scanning roughly 7 times/sec, which should be more than enough for this analysis and has always worked before.
Apart from possible electronic problems, what could be causing this pentachlorophenol spectra to look so bad? I attempted to adjust my mass axis, but while it improved it somewhat, did not really bring it within line.
Any advice would be helpful, I just may have to send this baby to Agilent for repair!
I'm currently running EPA Method 8270 (SemiVolatile Organics) on a HP MS 5973/ GC 6890.
The other day I changed the column and performed some source body maintence and replaced my filaments. This morning I ran an autotune, saved my tune and began to run my calibration curve, starting with the DFTPP tune.
My DFTPP, as required by the State of Michigan, contains DFTPP, Benzidine, Pentachlorophenol and DDT. While I was able to pass DFTPP with no problem, and my Benzidine tailing factor was well within range and my DDT breakdown was minimal, the Pentachlorophenol chromatography was extremely choppy - as if it did n't scan enough.
Upon further inspection of my DFTPP method, it was determined that I was scanning roughly 7 times/sec, which should be more than enough for this analysis and has always worked before.
Apart from possible electronic problems, what could be causing this pentachlorophenol spectra to look so bad? I attempted to adjust my mass axis, but while it improved it somewhat, did not really bring it within line.
Any advice would be helpful, I just may have to send this baby to Agilent for repair!
