EN ISO 21587-2:2007

SLOVENSKI STANDARD
01-marec-2008
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SIST EN 955-2:1998
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Chemical analysis of aluminosilicate refractory products (alternative to the X-ray
fluorescence method) - Part 2: Wet chemical analysis (ISO 21587-2:2007)
Chemische Analyse feuerfester Erzeugnisse aus Alumosilicat (Alternative zum
Röntgenfluoreszenzverfahren) - Teil 2: Nasschemische Analyse (ISO 21587-2:2007)
Analyse chimique des produits réfractaires d'aluminosilicates (méthode alternative a la
méthode par fluorescence de rayons X) - Partie 2: Méthodes d'analyse chimique par voie
humide (ISO 21587-2:2007)
Ta slovenski standard je istoveten z: EN ISO 21587-2:2007
ICS:
81.080
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 21587-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2007
ICS 81.080 Supersedes EN 955-2:1995
English Version
Chemical analysis of aluminosilicate refractory products
(alternative to the X-ray fluorescence method) - Part 2: Wet
chemical analysis (ISO 21587-2:2007)
Analyse chimique des produits réfractaires Chemische Analyse feuerfester Erzeugnisse aus
d'aluminosilicates (méthode alternative à la méthode par Alumosilicat (Alternative zum
fluorescence de rayons X) - Partie 2: Méthodes d'analyse Röntgenfluoreszenzverfahren) - Teil 2: Nasschemische
chimique par voie humide (ISO 21587-2:2007) Analyse (ISO 21587-2:2007)
This European Standard was approved by CEN on 13 September 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
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© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21587-2:2007: E
worldwide for CEN national Members.

Foreword
The text of ISO 21587-2:2007 has been prepared by Technical Committee ISO/TC 33
"Refractories” of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 21587-2:2007 by Technical Committee CEN/TC 187 "Refractory products and
materials", the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by March 2008, and conflicting national
standards shall be withdrawn at the latest by March 2008.

This document supersedes EN 955-2:1995.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United
Kingdom.
Endorsement notice
The text of ISO 21587-2:2007 has been approved by CEN as EN ISO 21587-2:2007 without any
modifications.
INTERNATIONAL ISO
STANDARD 21587-2
First edition
2007-03-01
Chemical analysis of aluminosilicate
refractory products (alternative to the
X-ray fluorescence method) —
Part 2:
Wet chemical analysis
Analyse chimique des produits réfractaires d'aluminosilicates (méthode
alternative à la méthode par fluorescence de rayons X) —
Partie 2: Méthodes d'analyse chimique par voie humide

Reference number
ISO 21587-2:2007(E)
©
ISO 2007
ISO 21587-2:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 21587-2:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Determination of residual silicon(IV) oxide in solution . 2
4 Determination of aluminium oxide. 3
5 Determination of iron(III) oxide. 5
6 Determination of titanium(IV) oxide . 7
7 Determination of manganese(II) oxide by permanganate absorption spectrophotometric
method . 9
8 Determination of calcium oxide . 10
9 Determination of magnesium oxide. 11
10 Determination of sodium oxide by flame photometry . 12
11 Determination of potassium oxide by flame photometry . 14
12 Determination of chromium(III) oxide using diphenylcarbazide. 14
13 Determination of zirconium oxide by Xylenol orange. 16
14 Determination of phosphorus(V) oxide by molybdenum blue. 17
15 Test report . 19

ISO 21587-2:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21587-2 was prepared by Technical Committee ISO/TC 33, Refractories.
ISO 21587 consists of the following parts, under the general title Chemical analysis of aluminosilicate
refractory products (alternative to the X-ray fluorescence method):
⎯ Part 1: Apparatus, reagents, dissolution and gravimetric silica
⎯ Part 2: Wet chemical analysis
⎯ Part 3: Inductively coupled plasma and atomic absorption spectrometry methods

iv © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 21587-2:2007(E)

Chemical analysis of aluminosilicate refractory products
(alternative to the X-ray fluorescence method) —
Part 2:
Wet chemical analysis
1 Scope
This part of ISO 21587 specifies traditional ("wet") methods for the chemical analysis of aluminosilicate
refractory products and raw materials.
The methods are applicable to the determination of the following:
⎯ silicon(IV) oxide (SiO )
⎯ aluminium oxide (Al O )
2 3
⎯ iron(III) oxide (total iron oxide calculated as Fe O )
2 3
⎯ titanium(IV) oxide (TiO )
⎯ manganese(II) oxide (MnO)
⎯ calcium oxide (CaO)
⎯ magnesium oxide (MgO)
⎯ sodium oxide (Na O)
⎯ potassium oxide (K O)
⎯ chromium(III) oxide (Cr O )
2 3
⎯ zirconium oxide (ZrO )
⎯ phosphorous(V) oxide (P O )
2 5
This part of ISO 21587 gives alternatives to the X-ray fluorescence (XRF) method given in ISO 12677:2003,
Chemical analysis of refractory products by XRF — Fused cast bead method.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 21587-1:2007, Chemical analysis of aluminosilicate refractory products (alternative to the X-ray
fluorescence method) — Part 1: Apparatus, reagents, dissolution and gravimetric silica
ISO 26845, Chemical analysis of refractories — General requirements for wet chemical analysis, atomic
absorption spectrometry and inductively coupled plasma methods
ISO 21587-2:2007(E)
3 Determination of residual silicon(IV) oxide in solution
3.1 Principle
An aliquot portion of the stock solution (S1) or (S′1), after pH adjustment, is treated with ammonium
molybdate and the silicomolybdate is reduced to yield molybdenum blue, the absorbance of which is
measured.
The sum of this residual silicon(IV) oxide in solution plus the mass of silicon(IV) oxide (m − m ) derived in
1 2
ISO 21587-1:2007, 4.2.2.3 or 4.2.3.3, gives the total silicon(IV) oxide content.
3.2 Procedure
This determination should be commenced with little delay after the stock solution (S1) or (S′1) is prepared, as
prolonged standing can allow polymerization of silica to occur, leading to low results.
Transfer 10 ml of stock solution (S1) or (S′1) obtained in 4.2.2.3 or 4.2.3.3 of ISO 21587-1:2007 to a 100 ml
plastic beaker, and add 2 ml of hydrofluoric acid (1+9), mix with a plastic rod and allow to stand for 10 min.
Then add 50 ml of boric acid solution. Add 2 ml of ammonium molybdate solution while mixing at a
temperature of 25 °C, and allow to stand for 10 min. Add 5 ml of L(+)-tartaric acid solution while stirring, and
after 1 min add to it 2 ml of L(+)-ascorbic acid solution. Transfer the solution to a 100 ml volumetric flask, dilute
to the mark with water, mix, and allow to stand for 60 min.
Measure the absorbance of the solution in a 10 mm cell at a wavelength of 650 nm using water as the
reference.
3.3 Plotting the calibration graph
Transfer 0, 2, 4, 6, 8 and 10 ml aliquot portions (0 mg to 0,4 mg as silicon(IV) oxide) of dilute standard
silicon(IV) oxide solution (SiO 0,04 mg/ml) into several 100 ml plastic beakers, and to each add 10 ml of
blank solution (B1) or (B′1) obtained in 4.2.2.4 or 4.2.3.4 of ISO 21587-1:2007. Treat these solutions and
measure the absorbance as given in 3.2, and plot the absorbances against the amounts of silicon(IV) oxide.
Prepare the calibration graph by adjusting the curve so that it passes through the point of origin.
3.4 Calculation
Calculate the mass fraction of silicon(IV) oxide, w , as a percentage, using the following equation, with the
SiO
absorbances obtained by the procedure in 3.2 and the plotting of the calibration graph by the procedure in 3.3.
mm−+m−m×
()()
12 3 4
(1)
w=×100
SiO
m
where
m is the mass, in g, from 4.2.2.3 or 4.2.3.3 of ISO 21587-1:2007;
m is the mass, in g, from 4.2.2.3 or 4.2.3.3 of ISO 21587-1:2007;
m is the mass, in g, of silicon(IV) oxide in the aliquot portion of stock solution
...