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- Posts: 165
- Joined: Sun Oct 04, 2009 6:18 pm
Our lab has been running TO-15s for a number of years, successfully calibrating 0.05-50ppbv with little issue. One instrument even had a calibration last 4 years. We now have to routinely drop the 50, 20 or even the 10ppbv point for many heavy weight compounds including BTEX. We see complete saturation at these levels, with no difference in response. This is across 5 systems, and this only started about two years ago. Entech7200/7890/5975c. We also have other preconcentrators, a 5973, etc.
I can guarantee what we're seeing is not column or analyzer overload. I'm convinced it's something with the preconcentrator, either bad traps being overloaded, or heated/cooled zones not working properly. Any suggestions would be greatly appreciated.
Christian