Chromatography Forum

I was taught that to calculate the concentration of an aroclor, you pick five peaks. In each cal standard, you sum sum the areas of those peaks, and use those responses to build a curve.

Now, re-re-rereading 8082... is that just wrong? Does anyone else do it that way?

The method seems to be saying that you have to make a cal curve for each peaks of your five peaks, calculate concentrations for each of those peaks in your sample, and then average the concentrations to get your final result.

I guess that makes sense, given the way congeners weather at different rates.

Back in the early 1990's when I was doing them by GC-ECD I made X cal curves for each of X RT peaks for each arochlor and then average the X results to report that arochlor. I picked peaks that were unique to each arochlor so that I could use a mix of arochlors for my cal curve and still have it all work.