Leather and fur - Determination of chlorinated hydrocarbons - Part 2: Middle-chain chlorinated paraffins (MCCPs)
1 Scope
This document specifies the test method to determine the amount of middle-chain chlorinated paraffins (MCCPs) C14 to C17 in leather and fur.
This document is applicable to the determination of the amount of MCCPs in various leathers, furs and their products.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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.
GB/T 39364 Leather - Chemical, physical, mechanical and fastness tests - Sampling location (GB/T 39364-2020, ISO 2418: 2017, MOD)
QB/T 1267 Fur - Chemical, physical and mechanical and fastness tests - Sampling location
QB/T 1272 Fur - Preparation of chemical test samples
QB/T 2716 Leather - Preparation of chemical test samples
3 Terms and definitions
No terms and definitions are listed in this document.
4 Principle
The test sample is extracted using n-hexane in an ultrasonic bath under specified conditions. After a sulfuric acid clean-up, an aliquot is then analyzed using a gas chromatograph coupled to a mass selective detector with chemical ionization (GC-ECNI-MS).
A liquid chromatography system single quad (LC-MS) or with triple quad mass spectrometry (LC-MS/MS), as described in Annex C, can also be used if the user has demonstrated that the accuracy of measurement is equivalent to that of the GC-ECNI-MS method. In case of dispute or arbitration, the GC-ECNI-MS test result shall prevail.
In some cases when determining MCCPs using the GC-ECNI-MS method, the presence of sulfochlorinated paraffins and equivalent chain-length chloroalkenes can cause interference. Annex C proposes a LC-MS/MS application method that aims to give a better resolution and eliminates possible false positives determined with the GC-ECNI-MS method.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Sampling and sample preparation
8 Test procedures
9 Expression of results
10 Test report
Annex A (Informative) Comparison of clause/subclause numbers between this document and ISO 18219-2: 2021
Annex B (Informative) Technical differences between this document and ISO 18219-2: 2021 and their justifications
Annex C (Informative) LC-MS/MS analysis method
Annex D (Informative) Chromatographic analysis conditions
Annex E (Informative) Peak shape evaluation (PSE) with GC-ECNI-MS
Bibliography
