DIN Standards Committee Materials Testing
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 reaction gas (modifiers)
Prüfung keramischer Roh- und Werkstoffe - Direkte Bestimmung der Massenanteile von Spurenverunreinigungen in pulver-, kornförmigem und stückigem Graphit mittels optischer Emissionsspektrometrie mit induktiv gekoppeltem Plasma (ICP OES) und elektrothermischer Verdampfung (ETV) unter Einwirkung eines halogenierenden Reaktionsgases (Modifiers)
Overview
This standard specifies a method for analyzing the mass fractions of the impurities Ag, Al, As, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, S, Sb, Si, Sn, Sr, Ti, V, W, Y, Zn, Zr in graphite powders, granules and lumps. This method is applicable with restrictions to boron and silicon in terms of limited calibration options. The accuracy of determinations of boron and silicon in graphite carried out in accordance with this method depends on the respective graphite material (raw materials, production and morphology) and shall be validated by means of an independent method for each type of graphite. Subject to the main influencing variables (element, wavelength, plasma conditions and sample weight), the method is applicable to mass fractions of the aforementioned impurities ranging from about 0,001 mg/kg to about 10 000 mg/kg; this range can be limited depending on the element and wavelength. This standard is also applicable to soot, coke and coal with a mass fraction of ash of up to 1 %. Subject to previous testing, the standard can be applied to other carbonaceous sample mixtures and residues after sample incineration. This document has been prepared by Working Committee NA 062-02-64 AA "Chemische Analyse von nichtoxidischen keramischen Roh- und Werkstoffen" ("Chemical analysis of non-oxidic ceramic raw and basic materials") at DIN Standards Committee Materials Testing (NMP).
Document: references other documents
Responsible national committee
NA 062-02-66 AA - Chemical analysis of ceramic and glass materials
