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- Posts: 3
- Joined: Tue Jan 02, 2018 10:10 pm
My wastewater/groundwater lab is trying to start implementing EPA 8270 for semivolatiles. We currently don't do any other organics analysis on GCMS and I have never written a method from EPA before.
I would *love* to us EPA 3511 (microextraction) for sample prep. but I'm having trouble reconciling it with 8270. For example: EPA 3510 concentrates from 1 L to 1 mL extract, but 3511 only concentrates from about 35 mL to a 2 mL extract. This will lower the extracted concentration of the surrogates, spikes, control standards, etc. pretty drastically.
So... I have two questions:
1. What kind of quantification ranges have you found if you've used these methods together? I'm so inexperienced in organics that I can't even decide what range to cover with my calibration curve.
2. Will the lower concentration factor from a microextraction cause me to run into the bottom of my detection limit, and if so, should I up the concentration of surrogate, spikes, etc. to compensate.
I'm just trying to get an idea of what other labs are doing for the practical application of this method--it seems way better than 3510 in so many ways!