title: In-port derivatization coupled to different extraction techniques for the determination of alkylphenols in environmental water samples.
abstract: Large volume injection (LVI)-in port silylation coupled to gas chromatography-mass spectrometry (GC-MS) for the determination of alkylphenols (APs) in water samples applying four different extraction approaches was evaluated. Among the variables studied for in-port derivatization, vent time, cryo-focusing temperature and the ratio solvent volume/N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) volume were optimized using an experimental design approach. Regarding the extraction techniques, different approaches previously optimized in the research group were tested. On the one hand different polymeric materials were tested: silicon rod (SR), polyethersulfone (PES) and polydimethylsiloxane (PDMS), the latter in the stir-bar sorptive extraction format (SBSE-PDMS). PES was chosen among the polymeric materials due to the higher recoveries (compared with SR) and lower price (compared to PDMS in the stir-bar sorptive extraction, SBSE-PDMS). Both MASE and PES protocols were selected at this point for further method validation and application to real samples. Finally, the developed methods were validated and applied to the determination of target analytes in various aqueous environmental matrices, including estuarine water and wastewater. Acceptable repeatability in the case of MASE (5-17%) and PES (7-21%) procedures and method detection limits (MDLs, 5-123 and 28-328 ng L(-1) for PES and MASE, respectively) were obtained for most analytes. In terms of apparent recoveries in the presence of matrix, estuarine and effluent samples showed no significant matrix effect (apparent recoveries in the 73-121% for PES and 74-128% for MASE), while a stronger matrix effect was observed for influent wastewater samples (98-132% for PES and 65-156% for MASE). Both MASE and PES extractions combined with LVI-in-port derivatization-GC-MS were applied to the determination of APs in the estuary of Bilbao (Gulf of Biscay, Spain).
authors.affiliation: Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country, P. K. 644, 48080, Bilbao, Spain; Laboratoire de Chimie Analytique Bio-inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, CNRS UMR 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau Pyrénées, 2, av. P. Angot, 64053, Pau cedex 9, France.
authors.forename: J
authors.initials: J
authors.lastname: Cavalheiro
authors.affiliation: Laboratoire de Chimie Analytique Bio-inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, CNRS UMR 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau Pyrénées, 2, av. P. Angot, 64053, Pau cedex 9, France.
authors.forename: M
authors.initials: M
authors.lastname: Monperrus
authors.affiliation: Laboratoire de Chimie Analytique Bio-inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, CNRS UMR 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau Pyrénées, 2, av. P. Angot, 64053, Pau cedex 9, France.
authors.forename: D
authors.initials: D
authors.lastname: Amouroux
authors.affiliation: Laboratoire de Chimie Analytique Bio-inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, CNRS UMR 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau Pyrénées, 2, av. P. Angot, 64053, Pau cedex 9, France.
authors.forename: H
authors.initials: H
authors.lastname: Preud'Homme
authors.affiliation: Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country, P. K. 644, 48080, Bilbao, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Prieto
authors.affiliation: Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country, P. K. 644, 48080, Bilbao, Spain. Electronic address: olatz.zuloaga@ehu.es.
authors.forename: O
authors.initials: O
authors.lastname: Zuloaga
mesh_terms: D000081:Acetamides; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010636:Phenols / Q000032:analysis* / Q000302:isolation & purification; D052617:Solid Phase Microextraction; D013696:Temperature; D014297:Trimethylsilyl Compounds; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D000081:Acetamides; D010636:Phenols; D014297:Trimethylsilyl Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical; C103255:N,O-bis(trimethylsilyl)trifluoroacetamide
keywords: Alkylphenols; Different extraction techniques; In-port derivatization; Large volume injection; Water samples