EN ISO 5398-1:2007

SLOVENSKI STANDARD
01-januar-2009
8VQMH.HPLMVNRGRORþHYDQMHNURPRYHJDRNVLGDGHO.YDQWLWDWLYQDWLWUDFLMD
,62
Leather - Chemical determination of chromic oxide content - Part 1: Quantification by
titration (ISO 5398-1:2007)
Leder - Chemische Bestimmung des Chromoxidgehaltes - Teil 1: Bestimmung durch
Titration (ISO 5398-1:2007)
Cuir - Dosage de l'oxyde de chrome - Partie 1: Quantification par titrage (ISO 5398-
1:2007)
Ta slovenski standard je istoveten z: EN ISO 5398-1:2007
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 5398-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2007
ICS 59.140.30
English Version
Leather - Chemical determination of chromic oxide content - Part
1: Quantification by titration (ISO 5398-1:2007)
Cuir - Dosage chimique de l'oxyde de chrome - Partie 1: Leder - Chemische Bestimmung des Chromoxidgehalts -
Quantification par titrage (ISO 5398-1:2007) Teil 1: Bestimmung durch Titration (ISO 5398-1:2007)
This European Standard was approved by CEN on 28 July 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
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5398-1:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 5398-1:2007) has been prepared by Technical Committee CEN/TC 289 "Leather", the
secretariat of which is held by UNI, in collaboration with the International Union of Leather Technologists and
Chemists Societies (IULTCS).
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 February 2008, and conflicting national standards shall be withdrawn
at the latest by February 2008.
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.
INTERNATIONAL ISO
STANDARD 5398-1
IULTCS/IUC
8:1
First edition
2007-08-01
Leather — Chemical determination of
chromic oxide content —
Part 1:
Quantification by titration
Cuir — Dosage chimique de l'oxyde de chrome —
Partie 1: Quantification par titrage

Reference number
ISO 5398-1:2007(E)
IULTCS/IUC 8:1:2007(E)
©
ISO 2007
ISO 5398-1:2007(E)
IULTCS/IUC 8:1:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 5398-1:2007(E)
IULTCS/IUC 8:1:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Principle.1
5 Sampling and sample preparation.2
6 Reagents.2
6.1 Wet oxidation method .2
6.2 Alkaline fusion method .2
6.3 Iodometric titration .2
7 Apparatus .2
8 Methods .3
8.1 Preparation of analytical solution.3
8.2 Measurement of the aqueous solution.3
9 Calculation and expression of results.4
9.1 General.4
9.2 Repeatability.4
10 Test report .4
Annex A (informative) Determination of water and other volatile matter.5

ISO 5398-1:2007(E)
IULTCS/IUC 8:1:2007(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
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.
This part of ISO 5398 was prepared by the Chemical Tests Commission of the International Union of Leather
Technologists and Chemists Societies (IUC Commission, IULTCS) in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is
held by UNI, in accordance with the agreement on technical co-operation between ISO and CEN (Vienna
Agreement). It is based on IUC 8 originally published in J. Soc. Leather Trades Chemists 49, p. 17, (1965)
and declared an official method of the IULTCS in 1965.
IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the
advancement of leather science and technology. IULTCS has three Commissions, which are responsible for
establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an
international standardizing body for the preparation of test methods for leather.
ISO 5398 consists of the following parts, under the general title Leather — Chemical determination of chromic
oxide content:
⎯ Part 1: Quantification by titration
⎯ Part 2: Quantification by colorimetric determination
⎯ Part 3: Quantification by atomic absorption spectrometry
⎯ Part 4: Quantification by inductively coupled plasma – optical emission spectrometer (ICP-OES)
iv © ISO 2007 – All rights reserved

ISO 5398-1:2007(E)
IULTCS/IUC 8:1:2007(E)
Introduction
ISO 5398 has been split into four parts, each describing methods suitable for the determination of the chromic
oxide content in leather. The different techniques have been described to reflect the variations in industrial
practice compared with the more sensitive analytical equipment available for test laboratories. Variations also
exist in the range of chromic oxide that the methods are deemed suitable to quantify.
ISO 5398-1 describes a traditional technique applied in industry that does not require the use of advanced
analytical equipment.
ISO 5398-1:2007(E)
INTERNATIONAL STANDARD
IULTCS/IUC 8:1:2007(E)
Leather — Chemical determination of chromic oxide content —
Part 1:
Quantification by titration
1 Scope
This part of ISO 5398 describes a method for the determination of chromium in aqueous solution obtained
from leather. This is an analysis for total chromium in leather; it is not compound specific or specific to its
oxidation state.
This method describes the determination of chrome by iodometric titration and is to be applicable to
chromium-tanned leathers which are expected to have chromic oxide contents in excess of 0,3 %. Two
different methods are described as alternatives for obtaining chromium in a suitable solution. It is appropriate
to use either 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 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ISO 4044, Leather — Chemical tests — Preparation of chemical test samples
ISO 4047, Leather — Determination of sulphated total ash and sulphated water-insoluble ash
ISO 4684, Leather — Chemical tests — Determination of volatile matter
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
chromic oxide content
amount of chromium in leather, determined by this method and reported as chromic oxide
NOTE The chromic oxide content is expressed in percentage by mass, based on dry matter.
4 Principle
The chromium present in the leather is solubilized in the hexavalent state followed by analysis of the solution
...