DIN 51457 Testing of ceramic raw and basic materials - Direct determination of mass fractions of trace impurities in powders, granules and lumps of graphite by optical emission spectroscopy by inductively coupled plasma (ICP OES) and by electrothermal vaporization (ETV) under the action of a halogenated react

standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2017