Determination of alkylphenols originated from alkylphenol ethoxylates by cleavage treatment combined with GC-MS

摘要

A chemical cleavage technique was developed for the determination of alkylphenol ethoxylates (APEOs) in environmental samples involving the conversion of APEOs to alkylphenols (APs). Aluminum triiodide (AlI_3) and trimethylsilyl iodide were selected as cleavage reagents and the former was found to be highly reactive and suitable. With AlI_3 as cleavage reagent, nonylphenol ethoxylates (NPEOs) and octylphenol ethoxylates (OPEOs) were equivalently converted to the corresponding origins-nonylphenol (NP) and octylphenol (OP), which were detected by gas chromatography-mass spectrometry (GC-MS). The cleavage process was completed under refluxing condition. Water and methanol influenced the cleavage reaction significantly and should be removed prior to the cleavage reaction. The analytical approach was applied for the estimation of APEOs contents in wastewater by normalizing to APs and presented satisfactory recovery and reproducibility. This cleavage technique provides a common and reliable means to assess the environmental significance of samples contaminated by APEOs based on the presence of APs.