4.3.3. AAEMs

The analysis was conducted by wavelength-dispersive X-ray fluorescence spectroscopy with the use of an ARL OPTIM'X spectrometer from Thermo Fisher Scientific with an X-ray Rh lamp of 200 W with a 75-μm Be slit. The sample for this method was prepared by ashing at 815 ◦C before pressing into tablets with a 20% supplement of wax.
