title: Silicone rod extraction followed by liquid desorption-large volume injection-programmable temperature vaporiser-gas chromatography-mass spectrometry for trace analysis of priority organic pollutants in environmental water samples.
abstract: In this study a priority organic pollutants usually found in environmental water samples were considered to accomplish two extraction and analysis approaches. Among those compounds organochlorine compounds, pesticides, phthalates, phenols and residues of pharmaceutical and personal care products were included. The extraction and analysis steps were based on silicone rod extraction (SR) followed by liquid desorption in combination with large volume injection-programmable temperature vaporiser (LVI-PTV) and gas chromatography-mass spectrometry (GC-MS). Variables affecting the analytical response as a function of the programmable temperature vaporiser (PTV) parameters were firstly optimised following an experimental design approach. The SR extraction and desorption conditions were assessed afterwards, including matrix modification, time extraction, and stripping solvent composition. Subsequently, the possibility of performing membrane enclosed sorptive coating extraction (MESCO) as a modified extraction approach was also evaluated. The optimised method showed low method detection limits (3-35 ng L(-1)), acceptable accuracy (78-114%) and precision values (<13%) for most of the studied analytes regardless of the aqueous matrix. Finally, the developed approach was successfully applied to the determination of target analytes in aqueous environmental matrices including estuarine and wastewater samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain. Electronic address: sandra.delgado@ehu.es.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Delgado
authors.forename: Oscar
authors.initials: O
authors.lastname: Posada-Ureta
authors.forename: Maitane
authors.initials: M
authors.lastname: Olivares
authors.forename: Asier
authors.initials: A
authors.lastname: Vallejo
authors.forename: Nestor
authors.initials: N
authors.lastname: Etxebarria
mesh_terms: D000327:Adsorption; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D057230:Limit of Detection; D010575:Pesticides / Q000032:analysis*; D010636:Phenols / Q000032:analysis*; D010795:Phthalic Acids / Q000032:analysis*; D012828:Silicones / Q000302:isolation & purification*; D052616:Solid Phase Extraction; D013696:Temperature; D014835:Volatilization; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D010636:Phenols; D010795:Phthalic Acids; D012828:Silicones; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Environmental water samples; Large volume injection; Membrane enclosed sorptive coating; Priority organic pollutants; Silicone rod extraction