UNE-EN ISO 21079-3
Chemical analysis of refractories containing alumina, zirconia, and silica - Refractories containing 5 percent to 45 percent of ZrO₂ (alternative to the X-ray fluorescence method) - Part 3: Flame atomic absorption spectrophotometry (FAAS) and inductively coupled plasma emission spectrometry (ICP -AES) (ISO 21079-3:2008) (Endorsed by AENOR in June of 2008.)