SIST EN ISO 19070:2016

Leather - Chemical determination of N-methyl-2-pyrrolidone (NMP) in leather (ISO 19070:2016)

ISO 19070:2016 specifies a method to determine the amount of N-methyl-2-pyrrolidone (NMP) in leather and leather components.
This method may also be used for the determination of N-ethyl-2-pyrrolidone (NEP) in leather.

Leder - Chemische Bestimmung von N-methyl-2-pyrrolidon (NMP) in Leder (ISO 19070:2016)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des Gehalts an N-Methyl-2-pyrrolidon (NMP) in Leder und Lederbestandteilen fest.
Dieses Verfahren kann auch zur Bestimmung von N-Ethyl-2-pyrrolidon (NEP) in Leder angewendet werden.

Cuir - Détermination de la teneur en N-méthylpyrrolidone (NMP) dans le cuir (ISO 19070:2016)

ISO 19070:2016 spécifie une méthode de détermination de la teneur en N-méthyl-2-pyrrolidone (NMP) dans le cuir et les composants en cuir.
Cette méthode peut également être utilisée pour déterminer la teneur en N-éthyl-2-pyrrolidone (NEP) dans le cuir.

Usnje - Kemijsko določevanje N-metil-2-pirolidona (NMP) v usnju (ISO 19070:2016)

Ta mednarodni standard določa metodo za določevanje količine N-metil-2-pirolidona
(NMP) v usnju in delih iz usnja. Ta metoda se lahko uporablja tudi za določanje N-etil-2-pirolidona (NEP) v usnju.

General Information

• Status: Published
• Public Enquiry End Date: 10-Aug-2014
• Publication Date: 08-May-2016
• ICS: 59.140.30 - Leather and furs
• ICS: 71.040.50 - Physicochemical methods of analysis
• Technical Committee: IUSN - Leather
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-Apr-2016
• Due Date: 30-Jun-2016
• Completion Date: 09-May-2016
• Ref Project: EN ISO 19070:2016 - Leather - Chemical determination of N-methyl-2-pyrrolidone (NMP) in leather (ISO 19070:2016)

Overview

SIST EN ISO 19070:2016 specifies a reliable and precise chemical testing method for the determination of N-methyl-2-pyrrolidone (NMP) content in leather and leather components. Developed under the collaboration of the International Union of Leather Technologists and Chemists Societies (IULTCS) and CEN Technical Committee CEN/TC 289 “Leather,” this standard is crucial for compliance with European regulations such as REACH, which lists NMP as a substance of very high concern (SVHC). The method also covers the determination of N-ethyl-2-pyrrolidone (NEP) in leather.

This standard is applicable across the leather industry for chemical analysis purposes and ensures consistent quality control regarding solvent residues in leather products.

Key Topics

Scope and Application

• Chemical determination of N-methyl-2-pyrrolidone (NMP) in leather products and components using a standardised extraction and chromatographic quantification method.
• Also applicable for N-ethyl-2-pyrrolidone (NEP) detection.
• Supports regulatory compliance, particularly under EU REACH restrictions on NMP use.

Method Principle

• Extraction of leather samples in acetone at 50 °C using an ultrasonic bath for 1 hour.
• Subsequent chemical analysis through gas chromatography coupled with mass selective detection (GC-MS).
• Quantification through a calibration curve prepared from NMP standards.

Required Equipment and Reagents

• Analytical balance (accuracy to 0.0001 g)
• Ultrasonic bath with temperature control
• Sealable extraction containers suitable for acetone use
• Gas chromatograph with a mass selective detector (GC-MS)
• Solvents: acetone (analytical grade), and NMP standard of 99.5% purity or higher
• Micro-pipettes, volumetric flasks, PTFE membrane filters, and vials

Procedure Highlights

• Sample preparation in accordance with ISO 2418 and ISO 4044.
• Sample size of approximately 1 gram, cut into small pieces (2-3 mm).
• Extraction in acetone solvent at controlled temperature and duration.
• Filtration of the extract and immediate analysis or storage at 4 °C for up to 24 hours.
• Calibration using NMP solutions of known concentration to ensure precise quantification.

Quantification and Reporting

• Calculation of NMP content as mg per kg of leather.
• Method detection limit typically down to 5 mg/kg, suitable for monitoring low residual solvent levels.
• Test reports must include reference to ISO 19070, test date, identification details, measured NMP content, detection limit, and any deviations from the method.

Applications

• Leather manufacturers: To monitor residual chemical solvents ensuring product safety and regulatory compliance.
• Quality control laboratories: For routine testing of leather batches to control NMP and NEP content.
• Regulatory bodies: To verify adherence to chemical safety standards under EU REACH and other environmental health regulations.
• Research institutions: For studying solvent retention and emission in leather materials.
• Importers and exporters: To certify leather goods meet chemical limits demanded by international markets.

Related Standards

• ISO 2418: Leather - Sampling location for chemical, physical, mechanical and fastness tests: Provides guidelines for representative leather sampling essential for reproducibility in testing.
• ISO 4044: Leather - Preparation of chemical test samples: Details sample preparation methods which complement the procedures in ISO 19070.
• Additional relevant EN and ISO standards related to leather chemical safety and environmental regulations assist in comprehensive quality management.

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This standard is an essential reference for chemical testing in the leather sector, promoting safe use of chemicals, regulatory compliance, and enhanced product quality. By adopting ISO 19070:2016, organizations ensure accurate quantification of hazardous solvents, protecting consumers and supporting sustainable leather production.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2016
8VQMH.HPLMVNRGRORþHYDQMH1PHWLOSLUROLGRQD103YXVQMX,62
Leather - Chemical determination of N-methyl-2-pyrrolidone (NMP) in leather (ISO
19070:2016)
Leder - Chemische Bestimmung von N-methyl-2-pyrrolidon (NMP) in Leder (ISO
19070:2016)
Cuir - Détermination de la teneur en N-méthylpyrrolidone (NMP) dans le cuir (ISO
19070:2016)
Ta slovenski standard je istoveten z: EN ISO 19070:2016
ICS:
59.140.30 Usnje in krzno Leather and furs
71.040.50 Fizikalnokemijske analitske Physicochemical methods of
metode analysis
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19070
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2016
EUROPÄISCHE NORM
ICS 59.140.30
English Version
Leather - Chemical determination of N-methyl-2-
pyrrolidone (NMP) in leather (ISO 19070:2016)
Cuir - Détermination de la teneur en N-méthyl-2- Leder - Chemische Bestimmung von N-methyl-2-
pyrrolidone (NMP) dans le cuir (ISO 19070:2016) pyrrolidon (NMP) in Leder (ISO 19070:2016)
This European Standard was approved by CEN on 13 February 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, 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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19070:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19070:2016) 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 October 2016, and conflicting national standards shall
be withdrawn at the latest by October 2016.
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.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19070:2016 has been approved by CEN as EN ISO 19070:2016 without any modification.

INTERNATIONAL ISO
STANDARD 19070
IULTCS/IUC 34
First edition
2016-03-01
Leather — Chemical determination
of N-methyl-2-pyrrolidone (NMP)
in leather
Cuir — Détermination de la teneur en N-méthyl-2-
pyrrolidone (NMP) dans le cuir
Reference numbers
ISO 19070:2016(E)
IULTCS/IUC 34:2016(E)
©
ISO 2016
ISO 19070:2016(E)
IULTCS/IUC 34:2016(E)
© ISO 2016, 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.
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ii © ISO 2016 – All rights reserved

ISO 19070:2016(E)
IULTCS/IUC 34:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 1
6 Procedure. 2
6.1 Preparation of standard solutions . 2
6.1.1 NMP stock solution (1 000 μg/ml) . 2
6.1.2 NMP Calibration solution . 2
6.2 Sample preparation . 2
6.3 Extraction procedure . 2
7 Chromatographic determination . 2
8 Quantification . 3
9 Performance of the method . 3
10 Test report . 3
Annex A (informative) Chromatographic analysis . 4
...