Dispersive liquid-liquid microextraction followed by microwave-assisted silylation and gas chromatography-mass spectrometry analysis for simultaneous trace quantification of bisphenol A and 13 ultraviolet filters in wastewaters

Journal of Chromatography. a
Sara C CunhaJ O Fernandes

Abstract

A novel multi-residue gas chromatography-mass spectrometry (GC-MS) method was validated for the simultaneous determination of trace levels (ng/L) of 13 UV-filters and bisphenol A (BPA) in wastewater samples. It was based on dispersive liquid-liquid microextraction (DLMME) followed by rapid microwave-assisted silylation of the analytes. Several parameters of both extraction and derivatization steps such as type of extractive and dispersive solvents, solvent volumes, pH, salt addition, time and power of microwave were evaluated to achieve the highest yield and to attain the lowest detection limits. Optimized DLLME consisted in the formation of a cloudy solution promoted by the fast addition to the sample (10mL) of a mixture of tetrachloroethylene (50μL, extraction solvent) in acetone (1mL, dispersive solvent). The sedimented phase obtained was evaporated and further silylated under the irradiation of 600W microwave for 5min, being the derivatization yields similar to those obtained after a conventional heating process for 30min at 75°C. Limits of detection and quantification of the method using real samples were 2ng/L and 10ng/L, respectively. Mean extraction efficiency of 82% for three concentrations were achieved, supporting th...Continue Reading

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Citations

Oct 20, 2015·Environment International·Sara RamosLúcia Santos
Mar 13, 2017·Environmental Pollution·S C CunhaJ O Fernandes
Oct 5, 2018·Critical Reviews in Analytical Chemistry·M T García-CórcolesA Zafra-Gómez
Apr 30, 2020·Environmental Science and Pollution Research International·John O Unuofin
Dec 4, 2020·The Science of the Total Environment·Ke HeLee Blaney
Sep 1, 2017·Journal of the American Chemical Society·Ariel L FurstMatthew B Francis
Dec 6, 2021·The Science of the Total Environment·Karen DuisAnja Coors

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