PCB/ERRF
Posted: Wed Sep 17, 2008 3:20 pm
by frage
We ask more questions about PCBs.
I wanted to ask how can the calcore ERRF, the various peaks of a Aloclor without injecting individual congeners?
I thank you because these PCB with ECD make me mad! I always do them in MSD.
Francesco
Posted: Thu Sep 18, 2008 4:04 pm
by AICMM
frage,
The way most of the labs I know of did it (when I was young...) was to pick a group of peaks (typically 5) and calibrate on that group of peaks and then sum up the values. So, for example, you might have 100ppb standard of 1260 and you pick 5 peaks and each of them is worth 20 ppb. This gives pretty good linearity for most Arochlors (perhaps not so good 1221) and usually works well when PCB is not degraded or heavy interference. You can also drop a clear outlier and correct for the dropped peak when you do this. Try not to pick two peaks that overlap between two different Arochlor's (late 42 peaks and early 54 peaks for example.)
One option to consider.