EN ISO 21078-1:2008

SLOVENSKI STANDARD
01-maj-2008
Ugotavljanje borovega (III) oksida v ognjevzdržnih izdelkih - 1. del: Ugotavljanje
celotnega borovega oksida v oksidnih materialih keramike, stekla in glazur (ISO
21078-1:2008)
Determination of boron(III) oxide in refractory products - Part 1: Determination of total
boric oxide in oxidic materials for ceramics, glass and glazes (ISO 21078-1:2008)
Bestimmung des Gehaltes an Bor(III)-oxid in feuerfesten Erzeugnissen - Teil 1:
Bestimmung des Gesamtgehaltes an Bor(III)-oxid in oxidischen Werkstoffen für Keramik,
Glas und Glasuren (ISO 21078-1:2008)
Dosage de l'oxyde de bore(III) dans les produits réfractaires - Partie 1: Détermination de
l'oxyde de bore(III) total dans les matériaux oxydants pour les céramiques, les verres et
les émaux (ISO 21078-1:2008)
Ta slovenski standard je istoveten z: EN ISO 21078-1:2008
ICS:
81.080
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 21078-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 81.040.01; 81.060.01
English Version
Determination of boron (III) oxide in refractory products - Part 1:
Determination of total boron (III) oxide in oxidic materials for
ceramics, glass and glazes (ISO 21078-1:2008)
Dosage de l'oxyde de bore (III) dans les produits Bestimmung des Gehaltes an Bor(III)-oxid in feuerfesten
réfractaires - Partie 1: Détermination de l'oxyde de bore (III) Erzeugnissen - Teil 1: Bestimmung des Gesamtgehaltes an
total dans les matériaux oxydants pour les céramiques, les Bor(III)-oxid in oxidischen Werkstoffen für Keramik, Glas
verres et les émaux (ISO 21078-1:2008) und Glasuren (ISO 21078-1:2008)
This European Standard was approved by CEN on 28 December 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
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21078-1:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 21078-1:2008) has been prepared by Technical Committee ISO/TC 33 "Refractories"
in collaboration with 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 July 2008, and conflicting national standards shall be withdrawn at the
latest by July 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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 the United Kingdom.
Endorsement notice
The text of ISO 21078-1:2008 has been approved by CEN as a EN ISO 21078-1:2008 without any
modification.
INTERNATIONAL ISO
STANDARD 21078-1
First edition
2008-01-15
Determination of boron(III) oxide in
refractory products —
Part 1:
Determination of total boron(III) oxide in
oxidic materials for ceramics, glass and
glazes
Dosage de l'oxyde de bore(III) dans les produits réfractaires —
Partie 1: Détermination de l'oxyde de bore(III) total dans les matériaux
oxydants pour les céramiques, les verres et les émaux

Reference number
ISO 21078-1:2008(E)
©
ISO 2008
ISO 21078-1:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 21078-1:2008(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Preparation of the test sample . 2
5 Number of determinations . 2
6 Determination of boron(III) oxide by alkaline titrimetry. 3
7 Determination of boron(III) oxide by azomethine H absorption spectrophotometry. 5
8 Determination of boron(III) oxide by curcumin absorption spectrophotometry. 8
9 Determination of boron(III) oxide by inductively coupled plasma atomic emission
spectrometry (ICP-AES) . 12
10 Expression of test results. 14
11 Test report. 15
Annex A (informative) Interlaboratory test results . 16

ISO 21078-1:2008(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
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
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 21078-1 was prepared by Technical Committee ISO/TC 33, Refractories, in collaboration with Technical
Committee CEN/TC 187, Refractory products and materials.
ISO 21078 consists of the following parts, under the general title Determination of boron(III) oxide in refractory
products:
⎯ Part 1: Determination of total boron(III) oxide in oxidic materials for ceramics, glass and glazes
⎯ Part 2: Acid extraction method for the determination of boron(III) oxide in binder components

iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 21078-1:2008(E)

Determination of boron(III) oxide in refractory products —
Part 1:
Determination of total boron(III) oxide in oxidic materials for
ceramics, glass and glazes
1 Scope
This part of ISO 21078 specifies methods of determining boron(III) oxide in refractory products and raw
materials, in mass fractions of 0,01 % or greater. It is applicable to the determination of total boron(III) oxide in
oxidic materials for ceramics, glass and glazes.
The determination of boron(III) oxide is carried out using one of the following four methods:
a) alkaline titrimetry, which is applied to samples containing more than 0,5 % by mass of boron(III) oxide;
b) azomethine H absorption spectrophotometry, which is applied to samples containing from 0,01 % by
mass to 2,5 % by mass of boron(III) oxide;
c) curcumin absorption spectrophotometry (rothocyanine method), which is applied to samples containing
from 0,01 % by mass to 1,0 % by mass of boron(III) oxide;
d) inductively coupled plasma atomic emission spectrometry (ICP-AES), which is applied to samples
containing from 0,01 % by mass to 15 % by mass of boron(III) oxide.
NOTE 1 The method can be extended to 30 % boron(III) oxide using modified oxidic fluxes.
NOTE 2 Interlaboratory test results for this part of ISO 21078 are given in Annex A.
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 31-0, Quantities and units — Part 0: General principles
ISO 836, Refractories — Vocabulary
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 6353-2, Reagents for chemical analysis — Part 2: Specifications — First series
ISO 6353-3, Reagents for chemical analysis — Part 3: Specifications — Second series
ISO 21078-1:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 836 and the following apply.
3.1
dry unshaped refractories
dry particles and/or powder of unshaped refractories
3.2
wet unshaped refractories
wet particles and/or powder of unshaped refractories with liquid such as mortar and a mixture of
refractory-aggregate and pitch or resin
4 Preparation of the test sample
4.1 Refractory brick or its raw material
Carry out sampling in accordance with the contract between the user and producer. Take a specified quantity
from a lot of the sample and crush to pass through a 6,7 mm sieve (see ISO 3310-1). Reduce to about 100 g
by riffling or coning and quartering, then grind all the reduced sample to pass through a 300 µm sieve
(ISO 3310-1).
4.2 Unshaped refractories
Prepare two portions of approximately 100 g each of the sample for analysis (both dry and wet) and crush to
pass through a 300 µm sieve (see ISO 3310-1) in accordance with the following procedure.
4.3 Dry unshaped refractories
Take one bag or 5 kg of the sample from a lot, reduce to about 100 g as described in 4.1 and crush to pass
through a 300 µm sieve.
4.4 Wet unshaped refractories
Take a specified quantity from the sample and spread on a heat-resistant plate that does not react with the
sample (for example, a polyethylene tetrafluoride plate) to form a charge of 10 mm thickness. Dry the sample
in an air-bath or oven at 110°C ± 5°C for a minimum of 10 h. Then crush to pass through a 6,7 mm sieve,
reduce to about 100 g by riffling or coning and quartering, and grind to pass through a 300 µm sieve (see
ISO 3310-1).
4.5 Laboratory sample
Reduce the laboratory sample from 4.1 or 4.2 to approximately 25 g by coning and quartering, and grind to
pass through a 106 µm sieve. This is the test sample for analysis.
...