DIN EN ISO 18218-1:2015-11

This part of ISO 18218 is a method for determining ethoxylated alkylphenols (nonyphenol ethoxylate [NPEOn with 1 and octylphenol ethoxylate [OPEOn with 1 n 16]) in leather. This direct method is especially suitable where a larger number of leather samples are to be checked for the presence of ethoxylated alkylphenols. This method requires the use of high-performance liquid chromatography (HPLC) with triple quadrupole mass spectrometer (MSMS) to identify and quantify the ethoxylated alkylphenols. Annex A of this standard is only informative. In the leather industry, the most commonly used commercial ethoxylated alkylphenol is the NPEO with an average of 9 EO. It has an optimum cloud point in water for the typical leather processing temperatures of 40 °C to 55 °C. ISO 18218-1 and ISO 18218-2 use different solvents for the extraction of the ethoxylated alkylphenols from leather. Consequently, the two analytical methods are expected to give similar trends but not necessarily the same absolute result for the ethoxylated alkylphenol content in leather. This document (EN ISO 18218-2:2015) has been prepared by Technical Committee CEN/TC 289 "Leather", the secretariat of which is held by UNI, in collaboration with the "International Union of Leather Technologists and Chemists Societies (IULTCS)".