515.4 Column selection
Posted: Fri Jul 28, 2017 3:39 pm
Hello all,
I'm hoping that someone can point me in the right direction here. I'm running EPA method 515.4 with DB-5MSUI 60meters 0.25mm ID and 0.25 um film thickness. The Aciflourfen and Dinoseb loose sensitivity before a complete run is finished (maybe get about half way through a 50 injection run before the QC starts failing). I know that cutting the column will bring it back but I would like to have a solution that will get me through the whole run before this is needed. I have also tried a Rtx-1701 for this method but I run into problems with an interfering peak for Dalapon. What columns are people using for this method?
I'm hoping that someone can point me in the right direction here. I'm running EPA method 515.4 with DB-5MSUI 60meters 0.25mm ID and 0.25 um film thickness. The Aciflourfen and Dinoseb loose sensitivity before a complete run is finished (maybe get about half way through a 50 injection run before the QC starts failing). I know that cutting the column will bring it back but I would like to have a solution that will get me through the whole run before this is needed. I have also tried a Rtx-1701 for this method but I run into problems with an interfering peak for Dalapon. What columns are people using for this method?