EN ISO 21068-3:2008
Withdrawn
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Chemical analysis of silicon-carbide-containing raw materials and refractory products - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents (ISO 21068-3:2008)
28-02-2009
01-08-2008
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of nitrogen and oxygen
4.1 General
4.2 Combined determination of nitrogen and oxygen
by an analyser with thermal conductivity (CR)
and infrared absorption (IR) detection
5 Determination of nitrogen calculated as Si[3]N[4]
5.1 General
5.2 Acid decomposition - Titration method
5.3 Acid decomposition - Photometry method
5.4 Inert-gas fusion - Thermal conductivity method
5.5 Determination of total nitrogen
6 Determination of free Iron by Inductively Coupled
Plasma Atomic Emission Spectrometry (ICP-AES)
6.1 General
6.2 Copper sulfate method
6.3 Bromine/methanol method
7 Determination of free aluminium and free magnesium
7.1 General
7.2 Acid decomposition - Inductively coupled plasma atomic
emission spectroscopy (ICP-AES)
7.3 Acid decomposition - Flame Atomic Absorption
Spectrometry (FAAS)
7.4 Hydrogen generating method
8 Analysis of oxides
8.1 General
8.2 Wet methods
8.3 Flame atomic absorption and/or inductively coupled
plasma atomic emission spectrometer
8.4 XRF fusion method after ignition of the sample
8.5 Determination of silicon(IV) oxide, aluminium oxide,
iron(III) oxide, titanium(IV) oxide, calcium oxide,
magnesium oxide, sodium oxide, potassium oxide,
chromium(III) oxide, zirconium oxide, and boron oxide
9 Expression of results
10 Test report
Annex A (informative) Statistical results obtained with
analysis of refractories containing carbon
and/or silicon carbide
Bibliography
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