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analytical methodology page DETERMINATION (DETECTION) LIMITS (IN PPM) OF COMMONLY ANALYZED ELEMENTS FOR EDXRF
These are the smallest amounts which can be quantitatively measured. Defined as a signal which is 6 Σ units above background.
Mn 40
Fe2O3+ 10
Co 14
Ni 10
Zn 4
Ga 7.8
As 200
Rb 5
Sr 3.5
Y 7
Zr 7
Nb 8
Ba 20
La 20
Ce 20
Pb 8
Th 9