SIST EN ISO 17075-2:2017
(Main)Leather - Chemical determination of chromium(VI) content in leather - Part 2: Chromatographic method (ISO 17075-2:2017)
Leather - Chemical determination of chromium(VI) content in leather - Part 2: Chromatographic method (ISO 17075-2:2017)
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 ISO 17075-1 and this document, the results obtained with this
document are considered as the reference. The advantage of the method described in this document is
that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do
not show significant differences (see Annex D) and the results are comparable between both methods.
Leder - Chemische Bestimmung Prüfungen des Chrom(VI)-Gehalts in Leder - Teil 2: Ionenchromatographie (ISO 17075-2:2017)
Cuir - Dosage chimique du chrome(VI) - Partie 2 : Méthode par chromatographie ionique (ISO 17075-2:2017)
ISO 17075-2:2017 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 17075-2:2017 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 l'ISO 17075‑1 et le présent document, les résultats obtenus avec le présent document sont considérés comme les valeurs de référence. L'avantage de la méthode décrite dans le présent document 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 D) et les résultats obtenus avec chacune des deux méthodes sont comparables.
Usnje - Kemijsko določevanje kroma (VI) v usnju - 2. del: Kromatografska metoda (ISO 17075-2:2017)
Ta dokument določa metodo za določanje kroma (VI) v raztopinah, izluženih iz usnja pod določenimi pogoji. Opisana metoda je primerna za kvantifikacijo vsebnosti kroma (VI) v usnju do vrednosti najmanj 3 mg/kg.
Ta dokument se uporablja za vse vrste usnja.
Rezultati te metode so strogo odvisni od pogojev ekstrakcije. Rezultati,
pridobljeni z drugimi postopki ekstrakcije (ekstrakcijska raztopina, pH, čas ekstrakcije ipd.) niso primerljivi z rezultati, pridobljeni s postopkom, opisanim v tem dokumentu.
Če je vzorec usnja preskušen v skladu s standardom ISO 17075-1 in tem dokumentom, se rezultati, pridobljeni s tem
dokumentom, obravnavajo kot referenčni. Prednost v tem dokumentu opisane metode je, da barva ekstrakta ne povzroča motenj. Kljub temu medlaboratorijski preskusi ne odražajo bistvenih razlik (glej dodatek D) in rezultati obeh metod so primerljivi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 17075-2:2017
01-maj-2017
1DGRPHãþD
SIST EN ISO 17075:2008
8VQMH.HPLMVNRGRORþHYDQMHNURPD 9, YXVQMXGHO .URPDWRJUDIVNDPHWRGD
,62
Leather - Chemical determination of chromium(VI) content in leather - Part 2:
Chromatographic method (ISO 17075-2:2017)
Leder - Chemische Bestimmung Prüfungen des Chrom(VI)-Gehalts in Leder - Teil 2:
Ionenchromatographie (ISO 17075-2:2017)
Cuir - Dosage chimique du chrome(VI) - Partie 2 : Méthode par chromatographie ionique
(ISO 17075-2:2017)
Ta slovenski standard je istoveten z: EN ISO 17075-2:2017
ICS:
59.140.30 Usnje in krzno Leather and furs
71.040.50 Fizikalnokemijske analitske Physicochemical methods of
metode analysis
SIST EN ISO 17075-2:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 17075-2:2017
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SIST EN ISO 17075-2:2017
EN ISO 17075-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 59.140.30 Supersedes EN ISO 17075:2007
English Version
Leather - Chemical determination of chromium(VI)
content in leather - Part 2: Chromatographic method (ISO
17075-2:2017)
Cuir - Détermination chimique de la teneur en Leder - Chemische Bestimmung des Chrom(VI)-Gehalts
chrome(VI) du cuir - Partie 2: Méthode in Leder - Teil 2: Chromatographie (ISO 17075-2:2017)
chromatographique (ISO 17075-2:2017)
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 17075-2:2017 E
worldwide for CEN national Members.
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SIST EN ISO 17075-2:2017
EN ISO 17075-2:2017 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 17075-2:2017
EN ISO 17075-2:2017 (E)
European foreword
This document (EN ISO 17075-2:2017) 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 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 ISO 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 17075-2:2017 has been approved by CEN as EN ISO 17075-2:2017 without any
modification.
3
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SIST EN ISO 17075-2:2017
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SIST EN ISO 17075-2:2017
INTERNATIONAL ISO
STANDARD 17075-2
IULTCS/IUC 18-2
First edition
2017-02
Leather — Chemical determination of
chromium(VI) content in leather —
Part 2:
Chromatographic method
Cuir — Détermination chimique de la teneur en chrome(VI) du cuir —
Partie 2: Méthode chromatographique
Reference numbers
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(E)
©
ISO 2017
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(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. 2
7 Procedure. 3
7.1 Sampling and preparation of samples . 3
7.2 Preparation of analytical solution . 3
7.3 Chromatographic conditions . 4
7.4 Calibration . 4
7.5 Determination of the recovery rate . 5
8 Calculation and expression of results . 5
8.1 Calculation of chromium(VI) content . 5
8.2 Recovery rate (according to 7.5) . 6
8.3 Expression of results . 6
9 Test report . 6
Annex A (informative) Accuracy . 7
Annex B (informative) Chromatographic conditions for direct detection method .9
Annex C (informative) Chromatographic conditions for method with post-column reaction.12
Annex D (informative) Comparison between the colorimetric method (ISO 17075-1) and
the ionic chromatography method (ISO 17075-2) .16
© ISO 2017 – All rights reserved iii
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(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 17075-2 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 17075-2, together with ISO 17075-1, cancels and replaces ISO 17075:2007, which
has been technically revised.
The main changes compared to ISO 17075:2007 are as follows:
— the chromatographic analytical technique has been added;
— the sample preparation has been revised;
— mechanical shaking in 7.1 and 7.2 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
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
INTERNATIONAL STANDARD
IULTCS/IUC 18-2:2017(E)
Leather — Chemical determination of chromium(VI)
content in leather —
Part 2:
Chromatographic 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 ISO 17075-1 and this document, the results obtained with this
document are considered as the reference. The advantage of the method described in this document is
that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do
not show significant differences (see Annex D) 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.
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(E)
4 Principle
Extractable chromium(VI) is leached from the sample in phosphate buffer at pH 7,0 to 8,0. An aliquot of
the filtered extract is analysed for Cr(VI) using ion-exchange chromatography with UV-VIS detection.
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 (5.7), adjusted
2 4 2
to pH 8,0 ± 0,1 with phosphoric acid (5.2). 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 Phosphoric acid solution
700 ml o-phosphoric acid, ρ = 1,71 g/ml, made up to 1 000 ml with water (5.7).
First add approximately 200 ml of deionised water (5.7) to a 1 000 ml volumetric flask, then add the
700 ml of o-phosphoric acid and dilute to the mark with deionised water.
5.3 Potassium dichromate (K Cr O ), dried for (16 ± 2) h at (102 ± 2) °C.
2 2 7
5.4 Chromium(VI) stock solution
Dissolve 2,829 g potassium dichromate (K Cr O ) (5.3) in water (5.7) in a volumetric flask and make
2 2 7
up to 1 000 ml with water (5.7). One millilitre of this solution contains 1 mg of chromium.
A stock solution at this concentration level of hexavalent chromium is an alternative available
commercially.
5.5 Chromium(VI) standard solution
Pipette 1 ml of solution (5.4) into a 1 000 ml volumetric flask and make up to the mark with extraction
solution (5.1). One millilitre of this solution contains 1 μg of chromium.
The solution can be kept for up to one week in a refrigerator at (4 ± 3) °C but shall be warmed to room
temperature prior to use.
A stock solution of hexavalent chromium at this concentration level is an alternative available
commercially.
5.6 Argon or nitrogen, oxygen-free
Preference should be given to argon as an inert gas instead of nitrogen because argon has a higher
specific mass than air.
5.7 Distilled or deionised water, Grade 3 quality as specified in ISO 3696.
6 Apparatus and materials
Usual laboratory equipment and, in particular, the following.
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SIST EN ISO 17075-2:2017
ISO 17075-2:2017(E)
IULTCS/IUC 18-2:2017(E)
−1
6.1 Suitable mechanical orbital shaker, (100 ± 10) min .
6.2 Conical flask, of capacity 250 ml, with stopper.
6.3 Aeration tube and flow meter, suitable for a flow rate of (50 ± 10) ml/min.
6.4 Membrane filter, 0,45 µm pore size [polytetrafluoroethylene (PTFE) or polyamide 66].
6.5 Common laboratory glassware and pipettes.
6.6 Ion-exchange chromatograph, with UV detector or high performance liquid chromatograph
(HPLC) with anion-ex
...
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