DIN EN ISO 17072-2:2011-06

This part of ISO 17072 specifies a method for the determination of the total metal content in leather using digestion of the leather and subsequent determination with inductively coupled plasma/optical emission spectrometry (ICP-OES), or inductively coupled plasma/mass spectrometry (ICP-MS), or atomic absorption spectrometry (AAS) or spectrometry of atomic fluorescence (SFA).
This method determines the total metal content in leather; it is not compound-specific or specific to the oxidation state of the metals.
This part of ISO 17072 is not applicable to chromium-tanned leathers. In this case, ISO 5398-1, or ISO 5398-2, or ISO 5398-3, or ISO 5398-4 are used.
Digestion of the sample of ground leather (see 4044) is carried out using a ternary acid mixture or microwave digestion until complete mineralization is achieved. The residue is redissolved with water and analysed by AAS or ICP. The results are reported on the dry matter of the leather.
If sampling in accordance with ISO 2418 is not possible (for example, leather are from finished products like shoes or garments), details about the sampling shall be given together with the test report.
This document (EN ISO 17072-2:2011) has been prepared by Technical Committee CEN/TC 289 "Leather", the secretariat of which is held by UNI (Italy), in collaboration with 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 27-2 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