External Check does not pass.
Posted: Sun Feb 11, 2007 9:59 pm
Our lab analyzes PAH compounds on a UV-VIS HPLC (EPA methods 610 and 8310). Lately I have been having problems getting the external check (second source) to pass. the recoveries for benzo-a-anthracene exceed the limits on both detectors. The continuing calibrations pass fine.
So far I have changed the solvents, the pump filter and used a second source from two different vials (one completely new), but still with the same results ?
Does anyone have more troubleshooting ideas and/or a solution ?
Thanks !
So far I have changed the solvents, the pump filter and used a second source from two different vials (one completely new), but still with the same results ?
Does anyone have more troubleshooting ideas and/or a solution ?
Thanks !