Abstract
An analytical approach was developed to determine nonylphenol (NP), octylphenol (OP), nonylphenol ethoxylates (NPEO n ) and octylphenol ethoxylates (OPEO n ) in leather samples involving the conversion of NPEO n and OPEO n into the corresponding NP and OP. The four targets were extracted from samples using ultrasonic-assisted acetonitrile extraction. NP and OP in the extracts were directly isolated with hexane and quantitatively determined with 4-n-nonylphenol as internal standard by gas chromatography–mass spectrometry (GC–MS). For NPEO n and OPEO n in the extracts, they were first converted into NP and OP with aluminum triiodide as cleavage agent, and the yielded NP and OP were determined by GC–MS. The contents of NPEO n and OPEO n were calculated by normalizing to NPEO 9 and OPEO 9, respectively. This method was properly validated and the real sample tests revealed the pollution significance of leather by NPEO n and OPEO n .
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