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Draft Document – 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 standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2015
