title: Simultaneous extraction of polycyclic aromatic hydrocarbons and polychlorinated biphenyls in agricultural soils by pressurized liquid extraction and determination by gas chromatography coupled to tandem mass spectrometry.
abstract: A simple and rapid method based on pressurized liquid extraction has been validated for the simultaneous extraction of polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) from agricultural soil samples. Effective extraction was carried out in less than 17 min for all the studied compounds, and good recoveries were obtained for PAHs and PCBs, ranging from 70% to 112%, when blank samples were spiked at 2.5 microg kg(-1), except for naphthalene with recoveries close to 40%. The separation and determination were performed by gas chromatography coupled to tandem mass spectrometry using a triple quadrupole mass analyzer. The target compounds were detected by electron impact with selected reaction monitoring, and mass spectrometric conditions were optimized in order to increase selectivity and sensitivity. The developed method was validated, and matrix-matched calibration was used for quantification purposes. Repeatability and interday precision ranged from 0.9% to 16.8% and from 1.6% to 22.3%, respectively. Limits of quantification ranged from 0.07 to 2.50 microg kg(-1). The proposed method was applied to the analysis of agricultural soil samples collected from Almeria (Spain), and PAHs and PCBs were detected in some samples at concentrations ranging from 0.1 to 210 microg kg(-1).
authors.affiliation: Group Analytical Chemistry of Contaminants, Department of Analytical Chemistry, Almeria University, 04071 Almeria, Spain.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Martínez Vidal
authors.forename: Antonia
authors.initials: A
authors.lastname: Garrido Frenich
authors.forename: María de las Nieves
authors.initials: Mde L
authors.lastname: Barco Bonilla
authors.forename: Roberto
authors.initials: R
authors.lastname: Romero-González
authors.forename: Juan Antonio
authors.initials: JA
authors.lastname: Padilla Sánchez