scope:

This part of ISO 18218 is a method for determining ethoxylatedalkylphenols (nonyphenol ethoxylate [NPEOn with 1 ? n ? 16] andoctylphenol ethoxylate [OPEOn with 1 ? n ? 16]) in leather. Thisdirect method is especially suitable where a larger number ofleather samples are to be checked for the presence of ethoxylatedalkylphenols. This method requires the use of high-performanceliquid chromatography (HPLC) with triple quadrupole massspectrometer (MSMS) to identify and quantify the ethoxylatedalkylphenols. NOTE 1 In the leather industry, the most commonlyused commercial ethoxylated alkylphenol is the NPEO with an averageof 9 EO. It has an optimum cloud point in water for the typicalleather processing temperatures of 40 ?C to 55 ?C. NOTE 2 ISO18218-1 and ISO 18218-2 use different solvents for the extractionof the ethoxylated alkylphenols from leather. Consequently, the twoanalytical methods are expected to give similar trends but notnecessarily the same absolute result for the ethoxylatedalkylphenol content in leather.