-
- Posts: 81
- Joined: Wed Dec 28, 2011 6:26 pm
We analyze nitrate and nitrite by IC. EPA has set a 48 hours hold time for this analysis. Sometimes, in order to meet the hold time samples are acid preserved and results are reported as nitrate-nitrite to pH of less than 2. When we analyze the acidified samples, the baseline on our IC gets elevated and it takes a long time (more than 12 hours) to get back to normal.
Any suggestions?
Thank you very much for your time.