ISO 21814:2019 pdf download – Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of aluminium nitride powders. 10.2 Acid decomposition-ICP-OES method 10.2.1 Principle To prepare the test solution, the sample is decomposed in sulfuric acid and hydrogen peroxide. Boron, calcium, copper, iron, magnesium, manganese, molybdenum, nickel, potassium, silicon, sodium, titanium, tungsten, vanadium, and zinc are determined by ICP-OES at the selected wavelength. 10.2.2 Reagents Use the reagents described in 7.2.2 as well as the following: 10.2.2.1 Aluminium solution (4,93 g/500 ml), according to 9.2.2.3. 10.2.2.2 Ammonia solution (1+1). 10.2.2.3 Elemental standard solutions. — Boron standard solution...