scope:

This part of ISO 18218 is a method for determining alkylphenols(nonylphenol and octylphenol) and alkylphenol ethoxylates(nonylphenol ethoxylate and octylphenol ethoxylate) in leather andprocess auxiliaries. The analysis is based on high-performanceliquid chromatography (HPLC) or gas chromatography-massspectrometry (GC-MS). The analysis of the alkylphenol ethoxylate ismade by cleaving the alkylphenol ethoxylate and measuring thereleased alkylphenol. NOTE ISO 18218-1 and this part of ISO 18218use different solvents for the extraction of the ethoxylatedalkylphenols from leather. Consequently, the two analytical methodsare expected to give similar trends but not necessarily the sameabsolute result for the ethoxylated alkylphenol content inleather.