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- Posts: 35
- Joined: Wed Dec 21, 2016 12:38 am
There are varying detection limits for each compound, but the 16 PAH have always been detectable to 2 ng/ml or lower.
The anthracene peak is typically detectable down to 2 ng/ml but the area counts for ANT are at least 10x lower than phenanthrene.
But recently the ANT is now almost undetectable, we can see it at around 2 ppm, which is not acceptable. With a new column, a cleaned source, and new liner/septum/syringe there has been no improvement.
I don't think ANT should be much more difficult to detect than PHE, so what would cause such a large difference between the two?
ANT is the very small peak at 26 minutes.