EN ISO 21587-1:2007

SLOVENSKI STANDARD
01-marec-2008
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SIST EN 955-2:1998
SIST ENV 955-4:1998
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Chemical analysis of aluminosilicate refractory products (alternative to the X-ray
fluorescence method) - Part 1: Apparatus, reagents, dissolution and gravimetric silica
(ISO 21587-1:2007)
Chemische Analyse feuerfester Erzeugnisse aus Alumosilicat (Alternative zur
Röntgenfluoreszenzanalyse) - Teil 1: Geräte, Reagenzien, Aufschluss und
gravimetrische Bestimmung von Silicium(IV)-oxid (ISO 21587-1:2007)
Analyse chimique des produits réfractaires d'aluminosilicates (méthode alternative a la
méthode par fluorescence de rayons X) - Partie 1: Appareillage, réactifs, dissolution et
teneur en silice par gravimétrie (ISO 21587-1:2007)
Ta slovenski standard je istoveten z: EN ISO 21587-1:2007
ICS:
81.080
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 21587-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2007
ICS 81.080 Supersedes EN 955-2:1995, ENV 955-4:1997
English Version
Chemical analysis of aluminosilicate refractory products
(alternative to the X-ray fluorescence method) - Part 1:
Apparatus, reagents, dissolution and gravimetric silica (ISO
21587-1:2007)
Analyse chimique des produits réfractaires Chemische Analyse feuerfester Erzeugnisse aus
d'aluminosilicates (méthode alternative à la méthode par Alumosilicat (Alternative zur Röntgenfluoreszenzanalyse) -
fluorescence de rayons X) - Partie 1: Appareillage, réactifs, Teil 1: Geräte, Reagenzien, Aufschluss und gravimetrische
dissolution et teneur en silice par gravimétrie (ISO 21587- Bestimmung von Silicium(IV)-oxid (ISO 21587-1:2007)
1:2007)
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
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21587-1:2007: E
worldwide for CEN national Members.

Foreword
The text of ISO 21587-1:2007 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 21587-1:2007 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 and ENV 955-4:1997.

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 21587-1:2007 has been approved by CEN as EN ISO 21587-1:2007 without any
modifications.
INTERNATIONAL ISO
STANDARD 21587-1
First edition
2007-03-01
Chemical analysis of aluminosilicate
refractory products (alternative to the
X-ray fluorescence method) —
Part 1:
Apparatus, reagents, dissolution and
gravimetric silica
Analyse chimique des produits réfractaires d'aluminosilicates (méthode
alternative à la méthode par fluorescence de rayons X) —
Partie 1: Appareillage, réactifs, dissolution et teneur en silice par
gravimétrie
Reference number
ISO 21587-1:2007(E)
©
ISO 2007
ISO 21587-1:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 21587-1:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 2
3 Reagents. 2
4 Dissolution and gravimetric silica . 6

ISO 21587-1:2007(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
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The main task of technical committees is to prepare International Standards. Draft International Standards
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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 21587-1 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 21587-1:2007(E)

Chemical analysis of aluminosilicate refractory products
(alternative to the X-ray fluorescence method) —
Part 1:
Apparatus, reagents, dissolution and gravimetric silica
1 Scope
This part of ISO 21587 specifies reagents, dissolution and gravimetric silica analysis for the chemical analysis
of aluminosilicate refractory products and raw materials.
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.
This part of ISO 21587 should be used in conjunction with ISO 21587-2 and ISO 21587-3, which give the
analytical procedures for 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
ISO 21587-1:2007(E)
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 21587-2, Chemical analysis of aluminosilicate refractory products (alternative to the X-ray fluorescence
method) — Part 2: Wet chemical analysis
ISO 21587-3, Chemical analysis of aluminosilicate refractory products (alternative to the X-ray fluorescence
method) — Part 3: Inductively coupled plasma and atomic absorption spectrometry methods
ISO 26845, Chemical analysis of refractories — General requirements for wet chemical analysis, atomic
absorption spectrometry and inductively coupled plasma methods
3 Reagents
Standard solutions specified in ISO 26845 and the following reagents.
3.1 Standard volumetric solutions
3.1.1 Standard volumetric CyDTA solution, c(CyDTA) = 0,05 mol/l.
Dissolve 18 g of 1,2 cyclohexanediamine-N,N,N’,N’-tetraacetic acid monohydrate (CyDTA) in 500 ml of water
by the progressive addition of the minimum amount of potassium hydroxide solution.
NOTE Approximately 25 ml is required. Determine the exact strength of this solution by titration against the standard
volumetric zinc solution, c(Zn) = 0,05 mol/l.
3.1.2 Standard volumetric CyDTA solution, c(CyDTA) = 0,02 mol/l.
Add 16 ml of sodium hydroxide solution (100 g/l) and approximately 150 ml of water to 7,30 g of
1,2-cyclohexanediamine-N,N,N',N'-tetraacetic acid monohydrate (CyDTA), and dissolve by heating. After
cooling, dilute to 1 000 ml with water.
NOTE Approximately 25 ml is required. Determine the exact strength of this solution by titration against the standard
volumetric zinc solution, c(Zn) = 0,02 mol/l.
3.1.3 Standard volumetric EDTA solution, c(EDTA) = 0,012 5 mol/l.
Dissolve 5 g of EDTANa (ethylenediamine-tetraacetic acid disodium salt, dihydrate) in water and dilute to
1 000 ml in a volumetric flask. Store in a plastic bottle.
Standardize against calcium as follows.
Pipette 25 ml of standard calcium oxide solution (1 mg/ml), into a 500 ml conical flask, add 10 ml of potassium
hydroxide solution, and dilute to about 200 ml. Add about 0,015 g of screened Calcein indicator, and titrate
with the standard volumetric EDTA solution, from a fluorescent green colour to pink.
Standardize against magnesium as follows.
Pipette 25 ml of standard magnesium oxide solution (1 mg/ml), into a 500 ml conical flask, add 20 drops of
hydrochloric acid (concentrated) and 20 ml of ammonia solution (concentrated), and dilute to about 200 ml.
Add about 0,04 g of methylthymol blue complexone indicator, and titrate with the standard volumetric EDTA
solution.
2 © ISO 2007 – All rights reserved

ISO 21587-1:2007(E)
3.1.4 Standard volumetric zinc solution, c(Zn) = 0,05 mol/l.
Wash the surface of about 5 g of pellets of metallic zinc in about 50 ml of hydrochloric acid (1+1) to remove
oxide, then wash successively with water, ethanol and diethyl ether. Weigh 3,269 g of the dried pellets,
dissolve in 10 ml of hydrochloric acid (concentrated) and 50 ml of water, cool and dilute to the mark in a
1 000 ml volumetric flask. 1 ml of this zinc solution (0,05 mol/l) is equivalent to 2,55 mg of Al O .
2 3
3.1.5 Standard volumetric zinc solution, c(Zn) = 0,02 mol/l.
Wash the surface of the zinc (purity, more than 99,9 % by mass) with hydrochloric acid (1+3) and dissolve the
oxidized layer. Subsequently, wash with water, ethanol and diethyl ether in succession, then dry in a
desiccator. Weigh 0,66 g (recorded to 0,1 mg) of zinc, transfer it to a 300 ml beaker, and cover with a watch
glass. Add 20 ml of water and 10 ml of nitric acid carefully, and heat to dissolve on a steam bath. After cooling,
dilute to 1 000 ml in a volumetric flask with water.
Calculate the factor of this zinc solution using the following equation:
mA
F=× (1)
0,653 9 100
where
F is the factor of this zinc solution;
m is the mass, in grams, of the weighed zinc;
A is the purity, in percen
...