EN ISO 5398-1:2018
(Main)Leather - Chemical determination of chromic oxide content - Part 1: Quantification by titration (ISO 5398-1:2018)
General Information
- Abstract
This document 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.
- Status
- Published
- Publication Date
- 17-Jul-2018
- Withdrawal Date
- 30-Jan-2019
- Technical Committee
- CEN/TC 289 - Leather
- Drafting Committee
- CEN/TC 289/WG 1 - Chemical test methods
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 18-Jul-2018
- Completion Date
- 18-Jul-2018
Overview
EN ISO 5398-1:2018 - Leather: Chemical determination of chromic oxide content, Part 1: Quantification by titration specifies a laboratory method to determine total chromium (reported as chromic oxide) in leather. The procedure solubilizes chromium in the hexavalent state and quantifies it by iodometric titration. It is intended for chromium‑tanned leathers with chromic oxide contents typically in excess of 0.3%. The standard addresses sample preparation, two alternative routes to obtain a suitable aqueous solution, titration reagents and apparatus, calculation, repeatability and reporting.
Key topics and requirements
- Scope and principle: Total chromium determination (not compound‑ or oxidation‑state specific); chromium solubilized as hexavalent chromium and measured by iodometric titration.
- Two sample‑preparation alternatives:
- Wet oxidation method (nitric acid, sulfuric/perchloric mixture) - caution required due to reactive oxidizers.
- Alkaline fusion method (fusion mix of Na2CO3, K2CO3 and sodium tetraborate) followed by acid dissolution.
- Reagents for iodometric titration: potassium iodide (fresh), standardized 0.1 mol/L sodium thiosulfate, starch indicator.
- Apparatus: common laboratory glassware (500 mL conical flask, 50 mL burette), crucible for fusions, filtration devices, antibu mping granules.
- Sampling and sample prep references: sampling per ISO 2418 and test sample preparation per ISO 4044.
- Reporting and accuracy: calculation/expression of chromic oxide content on a dry matter basis, minimum two determinations per sample, and repeatability criteria provided.
Applications
- Quality control in tanneries: monitor chrome pickup and consistency in chrome‑tanned leathers.
- Laboratory testing and certification: routine chemical analysis for product specifications and internal QA.
- Regulatory and compliance checks: baseline total chromium content reporting for environmental and safety documentation (note: method does not distinguish Cr(III) vs Cr(VI)).
- Process troubleshooting: assess effectiveness of tanning processes and raw material variability.
Who should use this standard
- Leather chemists and technologists
- Industrial and contract testing laboratories
- Tanneries and leather manufacturers
- Product compliance officers and environmental testing units
Related standards
- ISO 2418 - Sampling location for leather tests
- ISO 4044 - Preparation of chemical test samples
- ISO 3696 - Water for analytical laboratory use
- ISO 4047 - Determination of sulphated ash
- ISO 4684 - Determination of volatile matter
Keywords: EN ISO 5398-1:2018, chromic oxide, chromium determination, iodometric titration, leather testing, wet oxidation, alkaline fusion, total chromium.
Relations
- Effective Date
- 10-May-2017
- Refers
ISO 4047:1977 - Leather — Determination of sulphated total ash and sulphated water-insoluble ash - Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 09-Feb-2026
- Refers
ISO 2418:2017 - Leather — Chemical, physical and mechanical and fastness tests — Sampling location - Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Referred By
EN 16419:2014 - Leather - Chamois leather for cleaning purposes - Classification and requirements - Effective Date
- 28-Jan-2026
- Consolidated By
ISO 5398-1:2018 - Leather — Chemical determination of chromic oxide content — Part 1: Quantification by titration - Effective Date
- 12-Feb-2026
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Frequently Asked Questions
EN ISO 5398-1:2018 is a standard published by the European Committee for Standardization (CEN). Its full title is "Leather - Chemical determination of chromic oxide content - Part 1: Quantification by titration (ISO 5398-1:2018)". This standard covers: This document 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.
This document 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.
EN ISO 5398-1:2018 is classified under the following ICS (International Classification for Standards) categories: 59.140.30 - Leather and furs. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 5398-1:2018 has the following relationships with other standards: It is inter standard links to EN ISO 5398-1:2007, ISO 4047:1977, ISO 4684:2005, ISO 3696:1987, ISO 2418:2017, ISO 4044:2017, EN 1457-1:2012, EN ISO 3743-2:1996, EN 16419:2014, ISO 5398-1:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 5398-1:2018 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2018
1DGRPHãþD
SIST EN ISO 5398-1:2009
8VQMH.HPLMVNRGRORþHYDQMHNURPRYHJDRNVLGDGHO .YDQWLWDWLYQDWLWUDFLMD
,62
Leather - Chemical determination of chromic oxide content - Part 1: Quantification by
titration (ISO 5398-1:2018)
Leder - Chemische Bestimmung des Chromoxidgehalts - Teil 1: Gehaltsbestimmung
durch Titration (ISO 5398-1:2018)
Cuir - Dosage chimique de l'oxyde de chrome - Partie 1: Quantification par titrage (ISO
5398-1:2018)
Ta slovenski standard je istoveten z: EN ISO 5398-1:2018
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 5398-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2018
EUROPÄISCHE NORM
ICS 59.140.30 Supersedes EN ISO 5398-1:2007
English Version
Leather - Chemical determination of chromic oxide content
- Part 1: Quantification by titration (ISO 5398-1:2018)
Cuir - Dosage chimique de l'oxyde de chrome - Partie 1: Leder - Chemische Bestimmung des Chromoxidgehalts
Quantification par titrage (ISO 5398-1:2018) - Teil 1: Gehaltsbestimmung durch Titration (ISO 5398-
1:2018)
This European Standard was approved by CEN on 8 June 2018.
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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5398-1:2018 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 5398-1:2018) has been prepared by Technical Committee IULTCS
"International Union of Leather Technologists and Chemists Societies" in collaboration with Technical
Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI.
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 January 2019, and conflicting national standards shall
be withdrawn at the latest by January 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5398-1:2007.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5398-1:2018 has been approved by CEN as EN ISO 5398-1:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 5398-1
IULTCS/IUC 8
Second edition
2018-06
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 numbers
ISO 5398-1:2018(E)
IULTCS/IUC 8:2018(E)
©
ISO 2018
ISO 5398-1:2018(E)
IULTCS/IUC 8:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2018 – All rights reserved
ISO 5398-1:2018(E)
IULTCS/IUC 8:2018(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
8.1.1 Wet oxidation method . 3
8.1.2 Alkaline fusion method . 3
8.2 Measurement of the aqueous solution . 3
9 Calculation and expression of results . 3
9.1 General . 3
9.2 Repeatability . 4
10 Test report . 4
Annex A (informative) Determination of water and other volatile matter . 5
ISO 5398-1:2018(E)
IULTCS/IUC 8:2018(E)
Foreword
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on the ISO list of patent declarations received (see www .iso .or
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