Compound or Specified Area Peak Factors (APFs) for Fe La quantification?

[Probeman]

This may be a dumb idea, but has anyone tried to calibrate the FeO vs. Fe2O3 Fe La peak shape/shift changes using Area Peak factors (APFs)?  Maybe using wustite (FeO) and hematite (Fe2O3)?

It may be that compound APFs using binary factors won't do the trick, but has anyone tried specified (sample specific measurements) APFs on the Fe La line?  Or just plain integrated intensity scans?

Compound APFs being based on binaries (e.g., Fe/O) which are calculated during the matrix iteration based on the concentration of the binary elements in question, while specified APFs are specific to every composition and are calculated prior to acquisition using wavescans on the standard and the specific unknown. See the detailed description of APFs in the PFE Reference manual.

We've really got to get the quantification of Fe La/Lb lines working better...