DIN EN ISO 17072-1:2011-06

This part of ISO 17072 specifies a method for the determination of extractable metals in leather, first using extraction with an acid artificial-perspiration solution and subsequent determination with inductively coupled plasma/optical emission spectrometry (ICP-OES), or inductively coupled plasma/atomic emission spectrometry (ICP-AES), or inductively coupled plasma/mass spectrometry (ICP-MS), or atomic absorption spectrometry (AAS) or spectrometry of atomic fluorescence (SFA).
This method is especially suitable for determining the extractable chromium in chromium-tanned leathers.
This method determines extractable metals in leather; it is not compound-specific or specific to the oxidation state of the metals.
A sample of leather is ground and extracted at (37 ± 2) °C for 4 h ± 5 min in an acid artificial-perspiration solution. The extract solution is filtered, acidified and analysed by ICP, or SFA or AAS. If necessary, digest a portion of filtrate solution in accordance with ISO 17072-2.
The results are reported on the dry matter of the leather.
If sampling in accordance with ISO 2418 is not possible (for example, leathers are from finished products like shoes or garments), details about the sampling shall be given together with the test report.
This document (EN ISO 17072-1:2011) has been prepared by Technical Committee CEN/TC 289 "Leather", the secretariat of which is held by UNI (Italy), in collaboration with the International Union of Leather Technologists and Chemists Societies (IULTCS).
The responsible German committee is Working Committee NA 062-05-52 AA "Chemische Prüfverfahren für Leder" ("Chemical test methods of leather") of the Materials Testing Standards Committee (NMP) at DIN.
This document is based on the method specified in IUC 27-1 of IULTCS.
DIN EN ISO 17072 consists of the following parts, under the general title "Leather - Chemical determination of metal content":
- Part 1: Extractable metals
- Part 2: Total metal content