-
- Posts: 3
- Joined: Mon Nov 17, 2008 3:35 pm
Here's the problem, whenever we run a new pcb-free transformer oil on the 7890 we get several peaks that appear in the first 5 minutes of the run. These peaks are significant and reproducible, no matter what transformer oil we run. These peaks do not appear on the 5890 for the same oils. Also, none of these peaks appear when we anlayze a hexane blank or when we analyze pure mineral oil.
For sample prep we dilute 0.4 grams of oil with 19.6 mL of hexane and treat every sample with fluorisil and have even tried acid treating the pcb free oils.
Do we need to change our sample prep procedure or do we need to install a cleanup column? Help please.