EN ISO 17075-1:2017

Leather - Chemical determination of chromium(VI) content in leather - Part 1: Colorimetric method (ISO 17075-1:2017)

ISO 17075-1:2017 specifies a method for determining chromium(VI) in solutions leached from leather under defined conditions. The method described is suitable to quantify the chromium(VI) content in leathers down to 3 mg/kg.
ISO 17075-1:2017 is applicable to all leather types.
The results obtained from this method are strictly dependent on the extraction conditions. Results obtained by using other extraction procedures (extraction solution, pH, extraction time, etc.) are not comparable with the results produced by the procedure described in this document.
If a leather sample is tested with both this document and ISO 17075-2, the results obtained with ISO 17075-2 are considered as the reference. The advantage of the method described in ISO 17075-2 is that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do not show significant differences (see Annex C) and the results are comparable between both methods.

Leder - Bestimmung des Chrom(VI)-Gehalts in Leder - Teil 1: Kolorimetrisches Verfahren (ISO 17075-1:2017)

Cuir - Détermination chimique de la teneur en chrome(VI) du cuir - Partie 1: Méthode colorimétrique (ISO 17075-1:2017)

ISO 17075-1:2017 spécifie une méthode de détermination de la teneur en chrome(VI) de solutions obtenues par lessivage du cuir dans des conditions définies. La méthode décrite est adaptée à la quantification dans les cuirs de teneurs en chrome(VI) à partir de 3 mg/kg.
ISO 17075-1:2017 est applicable à tous les types de cuir.
Les résultats obtenus avec cette méthode sont strictement tributaires des conditions d'extraction. Les résultats obtenus avec d'autres modes opératoires d'extraction (solution d'extraction, pH, durée d'extraction, etc.) ne sont pas comparables aux résultats acquis avec le mode opératoire décrit dans le présent document.
Si un échantillon de cuir est soumis à essai selon le présent document et l'ISO 17075‑2, les résultats obtenus avec l'ISO 17075‑2 sont considérés comme les valeurs de référence. L'avantage de la méthode décrite dans l'ISO 17075‑2 est qu'il n'y a pas d'interférence due aux colorants de l'extrait. Néanmoins, les essais interlaboratoires ne montrent pas de différences significatives (voir l'Annexe C) et les résultats avec chacune des deux méthodes sont comparables.

Usnje - Kemijsko določevanje kroma (VI) v usnju - 1. del: Kolorimetrična metoda (ISO 17075-1:2017)

Ta standard določa metodo za preskušanje nevarnih kemikalij v usnju.

General Information

• Status: Published
• Publication Date: 14-Feb-2017
• Withdrawal Date: 30-Aug-2017
• ICS: 59.140.30 - Leather and furs
• 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: 15-Feb-2017
• Due Date: 08-Apr-2017
• Completion Date: 15-Feb-2017
• Ref Project: SIST EN ISO 17075-1:2017 - Leather - Chemical determination of chromium(VI) content in leather - Part 1: Colorimetric method (ISO 17075-1:2017)

Relations

• Replaces: EN ISO 17075:2007 - Leather - Chemical tests - Determination of chromium(VI) content (ISO 17075:2007)
• Effective Date: 08-Jun-2022

Overview

EN ISO 17075-1:2017 - "Leather - Chemical determination of chromium(VI) content in leather - Part 1: Colorimetric method" - is a CEN-endorsed ISO standard that specifies a laboratory method to determine extractable chromium(VI) (hexavalent chromium) from leather. The method uses a phosphate-buffered extraction (pH 7.0–8.0) and a colorimetric reaction with 1,5‑diphenylcarbazide, producing a red/violet complex measured photometrically at 540 nm. It is applicable to all leather types and can quantify chromium(VI) down to 3 mg/kg (expressed on the dry mass of the sample).

Key Topics

• Scope and applicability
  • Measurement of extractable chromium(VI) from leather under defined extraction conditions.
  • Applicable to all leather types; results are strictly dependent on following the specified extraction procedure.
• Analytical principle
  • Leaching in phosphate buffer (pH 7.0–8.0), optional removal of coloured co‑extractives via solid phase extraction (SPE), oxidation of 1,5‑diphenylcarbazide to produce a measurable complex at 540 nm.
• Detection limit
  • Method suitable to quantify chromium(VI) content down to 3 mg/kg.
• Reagents and equipment
  • Key reagents include dipotassium hydrogenphosphate buffer, 1,5‑diphenylcarbazide (DPC), and potassium dichromate standards.
  • Typical lab equipment: mechanical orbital shaker, photometer/spectrophotometer, SPE material (if required), oxygen‑free degassing (argon or nitrogen).
• Result comparability
  • Results depend on extraction solution, pH, extraction time and other procedural details; results obtained with different extraction procedures are not comparable.
  • When both methods are applied, ISO 17075-2 (ion chromatography) is considered the reference method; however, interlaboratory comparisons show both methods yield comparable results (see Annex C).

Applications

• Laboratory testing and quality control for leather manufacturers and tanneries to monitor hexavalent chromium levels in finished leather.
• Regulatory compliance and product safety verification where chromium(VI) limits are enforced by legislation or customer requirements.
• Incoming raw-material screening and supplier qualification to reduce chemical risk and ensure safer leather products.
• Retailers and brands can use test results to support declarations and reduce exposure risk to consumers and workers.

Who uses this standard

• Accredited testing laboratories
• Leather manufacturers and tanneries
• Product safety and compliance teams
• Regulatory authorities and certification bodies
• R&D and quality assurance groups in the leather supply chain

Related standards

• ISO 17075-2 - Chromium(VI) in leather: ionic chromatography method (reference where both methods used).
• Normative references cited in EN ISO 17075-1: ISO 2418, ISO 3696, ISO 4044, ISO 4684.

Keywords: EN ISO 17075-1:2017, chromium(VI) in leather, hexavalent chromium test, colorimetric method, leather testing standard, ISO 17075-2, leather quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN ISO 17075:2008
8VQMH.HPLMVNRGRORþHYDQMHNURPD9,YXVQMXGHO.RORULPHWULþQDPHWRGD
,62
Leather - Chemical determination of chromium(VI) content in leather - Part 1:
Colorimetric method (ISO 17075-1:2017)
Leder - Bestimmung des Chrom(VI)-Gehalts in Leder - Teil 1: Kolorimetrisches Verfahren
(ISO 17075-1:2017)
Cuir - Détermination chimique de la teneur en chrome(VI) du cuir - Partie 1: Méthode
colorimétrique (ISO 17075-1:2017)
Ta slovenski standard je istoveten z: EN ISO 17075-1:2017
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 17075-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2017
ICS 59.140.30 Supersedes EN ISO 17075:2007
English Version
Leather - Chemical determination of chromium(VI) content in
leather - Part 1: Colorimetric method (ISO 17075-1:2017)
Cuir - Détermination chimique de la teneur en chrome(VI) Leder - Bestimmung des Chrom(VI)-Gehalts in Leder - Teil
du cuir - Partie 1: Méthode colorimétrique (ISO 17075- 1: Kolorimetrisches Verfahren (ISO 17075-1:2017)
1:2017)
This European Standard was approved by CEN on 30 December 2016.

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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17075-1:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 17075-1:2017) has been prepared by Technical Committee CEN/TC 289
“Leather” the secretariat of which is held by UNI, in collaboration with Technical Committee IULTCS
“International Union of Leather Technologists and Chemists Societies”.
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 August 2017, and conflicting national standards shall
be withdrawn at the latest by August 2017.
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.
This document supersedes EN 17075:2007.
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 17075-1:2017 has been approved by CEN as EN ISO 17075-1:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 17075-1
IULTCS/IUC 18-1
First edition
2017-02
Leather — Chemical determination of
chromium(VI) content in leather —
Part 1:
Colorimetric method
Cuir — Détermination chimique de la teneur en chrome(VI) du cuir —
Partie 1: Méthode colorimétrique
Reference numbers
ISO 17075-1:2017(E)
IULTCS/IUC 18-1:2017(E)
©
ISO 2017
ISO 17075-1:2017(E)
IULTCS/IUC 18-1:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 17075-1:2017(E)
IULTCS/IUC 18-1:2017(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Chemicals . 2
6 Apparatus and materials. 3
7 Procedure. 3
7.1 Sampling and preparation of samples . 3
7.2 Preparation of analytical solution . 3
7.3 Determination of chromium(VI) in the solution obtained from the extraction procedure . 4
7.4 Blank solution . 4
7.5 Calibration . 5
7.6 Determination of the recovery rate . 5
7.6.1 Influence of the matrix . 5
7.6.2 Influence of the SPE material (6.9) . 5
8 Calculation and expression of results . 6
8.1 Calculation of chromium(VI) content . 6
8.2 Recovery rate (according to 7.6.1) . 6
8.3 Expression of results . 7
9 Test report . 7
Annex A (informative) Solid phase extraction (SPE) material . 8
Annex B (informative) Accuracy . 9
Annex C (informative) Comparison between the colorimetric method (ISO 17075-1) and
the ionic chromatography method (ISO 17075-2) .11
ISO 17075-1:2017(E)
IULTCS/IUC 18-1:2017(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html
ISO 17075-1 was prepared by the Chemical Test 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 cooperation between ISO and CEN
(Vienna Agreement).
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.
This first edition of ISO 17075-1, together with ISO 17075-2, cancels and replaces ISO 17075:2007, which
has been technically revised.
The main changes compared to ISO 17075:2007 are as follows:
— the sample preparation has been revised;
— mechanical shaking in 7.1, 7.2 and 7.3 has been revised.
A list of all parts in the ISO 17075 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 17075-1:2017(E)
INTERNATIONAL STANDARD
IULTCS/IUC 18-1:2017(E)
Leather — Chemical determination of chromium(VI)
content in leather —
Part 1:
Colorimetric method
1 Scope
This document specifies a method for determining chromium(VI) in solutions leached from leather
under defined conditions. The method described is suitable to quantify the chromium(VI) content in
leathers down to 3 mg/kg.
This document is applicable to all leather types.
The results obtained from this method are strictly dependent on the extraction conditions. Results
obtained by using other extraction procedures (extraction solution, pH, extraction time, etc.) are not
comparable with the results produced by the procedure described in this document.
If a leather sample is tested with both this document and ISO 17075-2, the results obtained with
ISO 17075-2 are considered as the reference. The advantage of the method described in ISO 17075-2 is
that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do
not show significant differences (see Annex C) and the results are comparable between both methods.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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, Water for analytical laboratory use — Specification and test methods
ISO 4044:2017, Leather — Chemical tests — Preparation of chemical test samples
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.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
chromium(VI) content
amount of chromium(VI) in leather determined after extraction with an aqueous salt solution at
pH 7,0 to 8,0
Note 1 to entry: The chromium(VI) content is reported as chromium(VI) in milligrams per kilogram (mg/kg),
expressed as the dry mass of the sample.
ISO 17075-1:2017(E)
IULTCS/IUC 18-1:2017(E)
4 Principle
Extractable chromium(VI) is leached from the sample in phosphate buffer at pH 7,0 to 8,0 and co-
extracted coloured substances which influence the detection are removed by solid phase extraction if
necessary. The chromium(VI) in solution oxidizes 1,5-diphenylcarbazide to 1,5-diphenylcarbazone to
give a red/violet complex with chromium which can be quantified photometrically at 540 nm.
5 Chemicals
All reagents used shall have at least analytical grade purity.
5.1 Extraction solution
Dissolve 22,8 g dipotassium hydrogenphosphate, K HPO ⋅3H O, in 1 000 ml water, adjusted to
2 4 2
pH 8,0 ± 0,1 with phosphoric acid (5.3). Degas this solution with either argon or nitrogen (5.6) or
ultrasonic bath.
Standard practice is to make up a fresh solution each day. However, the solution can be kept for up to one
week in a refrigerator at (4 ± 3) °C but shall be warmed to room temperature and degassed prior to use.
5.2 Diphenylcarbazide (DPC) solution
Dissolve 1,0 g 1,5-diphenylcarbazide, CO(NHNHC H ) , in 100 ml acetone, (CH ) CO, and acidified with
6 5 2 3 2
one drop of glacial acetic acid, CH COOH.
The solution should be kept in a brown glass bottle. The
...