Determination of Chlorinated-and Brominated-Polycyclic Aromatic Hydrocarbons in Soil Samples by Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry
In this study,simultaneous determination of Cl-PAHs and Br-PAHs was developed by gas chromatography coupled to triple quadrupole mass spectrometry( GC-QQQ-MS/MS).Soil samples were exacted and cleaned through silica gel column,dual-layer carbon reversible column respectively,after that,19 congeners of Cl-PAHs and 8 congeners of Br-PAHs were quantified.The GC-QQQ-MS/MS analysis condition was: EI and Multi-reaction monitoring( MRM) model,the electron emission energy was 70 eV;DB-5 MS fused silica capillary column( 60 m×0.25 mm,0.25 μm); the temperatures of injection,ion source,quadrupole and transfer line were 280,230,150 and 300 ℃,respectively.The collision and quenching flow were 1.5 and 2.25 mL/min,respectively.The carrier gas was Helium with the flow1.0 mL/min.The results showed that the relative standard deviation( RSD) of parallel standard reference sample were ≤12.0%,and the recoveries of d-PAHs,Cl-PAHs and Br-PAHs were between 70%-118%.The instrument detection limits of Cl-PAHs and Br-PAHs were between 0.4-5.0 pg.Concentrations of∑Cl-PAHs and ∑Br-PAHs in the soil samples from a certain industrial area were in the range of 725-1012 pg/g and 353-5924 pg/g,respectively.