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Problems with Hexachlorocyclopentadiene by EPA 508
Posted: Tue May 27, 2008 7:20 pm
by barneyjo
Anyone had any experience with HCCPD by EPA 508? Always is giving us a headache in DW PT studies. Getting like 150-172% recovery on PT studies, QC are good. Argh!
Posted: Thu Jun 12, 2008 12:53 pm
by Envirosun
Are you using a second source, and does it confirm your calibration?
Posted: Thu Jun 12, 2008 12:56 pm
by barneyjo
Yes it does. I know we had a problem with split/splitless injector on the pesticide method (508, etc). Might there be a similar problem here?
Posted: Thu Jun 12, 2008 12:57 pm
by barneyjo
My mistake on that last post. We did discover a problem with split/splitless on one of the other instruments - not necessarily the one for 508. Sorry.
Posted: Thu Jun 12, 2008 1:01 pm
by Envirosun
Do you see a quadratic curve over the range of your calibration? I have had experience with HCCPD being a poor responder in the past, but if it's coming up high, and your spikes are okay, I would look at the range of your plot.
Posted: Thu Jun 12, 2008 1:03 pm
by barneyjo
I'll go back to the lab and pull some curves and check. I'll let you know - thanks