Why not use pure Co metal as reference material for Co? All the background
effects come from the pyrite matrix and will be corrected accordingly, if
pyrite (or something similar) is used for Fe and S.

You need to take care to check the background positions for the weak Co peak.

Have fun,
Ralf




> Hi all - I'm looking for standard(s) to use for low levels (few hundred
> ppm) Co in pyrite.  Any suggestions for either calibration or check
> standards?
>
> Ken Severin
>
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