EN 14945:2005

SLOVENSKI STANDARD
01-maj-2006
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Refractory products and materials - Spectrometric determination of chromium (VI) in
chrome bearing refractories, before and after use
Feuerfeste Erzeugnisse und Werkstoffe - Spektrometrische Bestimmung des Chrom(VI)-
Gehaltes in chromhaltigen feuerfesten Erzeugnissen vor und nach der Verwendung
Produits et matériaux réfractaires - Détermination par spectrométrie du chrome VI dans
des matériaux réfractaires a forte teneur en chrome, avant et apres usage
Ta slovenski standard je istoveten z: EN 14945:2005
ICS:
81.080 Ognjevzdržni materiali Refractories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14945
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 81.080
English Version
Refractory products and materials - Spectrometric determination
of chromium (VI) in chrome bearing refractories, before and after
use
Produits et matériaux réfractaires - Détermination par Feuerfeste Erzeugnisse und Werkstoffe - Spektrometrische
spectrométrie du chrome VI dans des matériaux Bestimmung des Chrom(VI)-Gehaltes in chromhaltigen
réfractaires à forte teneur en chrome, avant et après usage feuerfesten Erzeugnissen vor und nach der Verwendung
This European Standard was approved by CEN on 19 September 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14945:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Principle.4
4 Apparatus .4
5 Reagents.5
6 Sampling.5
7 Calibration .6
8 Procedure .6
9 Calculation of results.7
10 Test report .7

Foreword
This European Standard (EN 14945:2005) has been prepared 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 June 2006, and conflicting national standards shall be withdrawn at
the latest by June 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This European Standard describes a method for the spectrometric determination of chromium (VI) in chrome
bearing refractories, before and after use. It is applicable to fired magnesia-chrome products (containing
natural chromite, fused grain or co-clinker) and to unfired materials (with refractory cement or chemical bonds)
although it is not to be restricted to these types of refractory. The method is applicable to concentrations up to
500 mg/kg of chromium (VI).
This range may be extended or reduced by modifying the dilution factors.
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.
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

3 Principle
Hexavalent chromium is extracted from the sample using a solution of 2 % (w/v) NaOH / 3 % (w/v) Na CO
2 3
which dissolves the common hexavalent chromium compounds potentially present (Ca, Fe, Na, K, Mg, Zn, Cu,
Pb) but not their trivalent counterparts.
The chromium (VI) is then determined spectrometrically by reaction with 1,5 - diphenyl carbazide which forms
a red-violet chromium complex. The absorbance of the complex is measured at a wavelength between
540 nm and 550 nm, the exact wavelength being given in the test report.
NOTE It is recognized that the method does not entail total dissolution of the test sample and hence not all the
chromium (VI) may be taken into solution. Trials have indicated that the method yields a minimum of 80 % of the total
chromium (VI) present and an inter-laboratory reproducibility of ± 15 % of content. Should a more a
...