Hi all,
I'm hoping someone could help me. We have started some experiments
with PCBs. We extracted control and PCB spiked sediment samples by
soxhlet (hexane/ acetone). We can see the PCBs in the spike by GCMS
but not ECD. The ECD gave peaks for an SRM and for the test mixture
but for these samples (Hudson river sediment). I have to turn up the
ECD attenuation and get just a couple of really tiny peaks. I find it
difficult to believe the ECD is less sensitive than the MS. We tried
adding some small pieces of clean copper to see it was a sulfur
problem but no improvement.

Any ideas or suggestions?

Thanks