title: Stir frit microextraction: an approach for the determination of volatile compounds in water by headspace-gas chromatography/mass spectrometry.
abstract: In this article, a novel extraction approach, called stir frit microextraction (SFME), is presented. The new approach combines the extractive capability of a commercial polyethylene frit (20 μm of pore size) with the stirring in the same device. The proposed extraction procedure allows the determination of benzene, toluene, ethylbenzene, xylene isomers and styrene (BTEX-S) in water samples. The analytes are extracted on the frit, previously conditioned with methanol, under continuous magnetic stirring. Once the extraction is performed, the frit is transferred to a headspace vial where the volatile compounds are desorbed from the frit (90 °C, 30 min) in a headspace module and analyzed by gas chromatography/mass spectrometry. Headspace conditions (time and temperature) as well as extraction conditions (ionic strength, type of stirring, extraction time, stirring rate and sample volume) have been systematically evaluated. The method was characterized on the basis of its linearity, sensitivity and precision. Limits of detection were in the range from 18 ng/L (o-xylene) to 65 ng/L (benzene). The repeatability of the proposed method, expressed as relative standard deviation (RSD) varied between 3.8% (toluene) and 8.2% (m- and p-xylene). The recovery study carried out in different water samples provided an average recovery of 94%, which demonstrated the applicability of the stir frit microextraction for the analytical problem selected in this article.
authors: Department of Analytical Chemistry, Institute of Fine Chemitry and Nanochemistry, Marie Curie Building, Campus de Rabanales, University of Córdoba, 14071 Córdoba, Spain.
authors: M
authors: M
authors: Roldán-Pijuán
authors: Department of Analytical Chemistry, Institute of Fine Chemitry and Nanochemistry, Marie Curie Building, Campus de Rabanales, University of Córdoba, 14071 Córdoba, Spain.
authors: M C
authors: MC
authors: Alcudia-León
authors: Department of Analytical Chemistry, Institute of Fine Chemitry and Nanochemistry, Marie Curie Building, Campus de Rabanales, University of Córdoba, 14071 Córdoba, Spain.
authors: R
authors: R
authors: Lucena
authors: Department of Analytical Chemistry, Institute of Fine Chemitry and Nanochemistry, Marie Curie Building, Campus de Rabanales, University of Córdoba, 14071 Córdoba, Spain.
authors: S
authors: S
authors: Cárdenas
authors: Department of Analytical Chemistry, Institute of Fine Chemitry and Nanochemistry, Marie Curie Building, Campus de Rabanales, University of Córdoba, 14071 Córdoba, Spain. Electronic address: qa1meobj@uco.es.
authors: M
authors: M
authors: Valcárcel
mesh_terms: D001555:Benzene Derivatives / Q000032:analysis* / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D057230:Limit of Detection; D009994:Osmolar Concentration; D015203:Reproducibility of Results; D052617:Solid Phase Microextraction / Q000295:instrumentation* / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D001555:Benzene Derivatives; D014867:Water