Update: 28 September, 2023
This document describes a routine method for the quantitative determination of 4-nonylphenol (NP), 4-nonylphenol monoethoxylate (NP1EO), and 4-nonylphenol diethoxylate (NP2EO) in sludge samples. A Soxtec® extraction procedure was used to enrich the target compounds from the solid matrix. Quantitative determinations were performed by high-speed gas chromatography/mass spectrometry using a short apolar fused silica column. Derivatization allows NP1EO and NP2EO to be analyzed by gas chromatography. The relative standard deviation was close to 5% for the analysis of 10 different sludges analyzed seven times each. Recoveries were determined for a sludge reference material and were higher than 90%. The experimental limits of quantification were 2, 5, and 5 µg/g of dry matter (µg/g DM), respectively, for NP, NP1EO, and NP2EO. Good agreement was observed between results obtained with this method and those obtained by our previous method, which used normal-phase liquid chromatography with an aminosilica column. This method was applied to the determination of alkylphenols and alkylphenol mono- and diethoxylates in sewage sludge by high-speed gas chromatography/mass spectrometry.
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Publication date: 02 July, 2012
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