[Determination of 39 polychlorinated biphenyls in indoor dust using ultrasonic extraction and gas chromatography-tandem mass spectrometry].

A method for the determination of 39 polychlorinated biphenyls (PCBs) in indoor dust was developed. A vacuum cleaner was used for gathering the house dust. N-Hexane-dichloromethane (1: 1, v/v) was added and the extraction was performed in an ultrasonic bath. The supernatant was concentrated and then 0.1 mL n-hexane-dichloromethane (1: 1, v/v) was added. Gas chromatography-tandem mass spectrometry (GC-MS/MS) in selected-reaction monitoring (SRM) mode has been investigated for the determination of the 39 PCBs congeners in indoor dust. The 39 PCBs had highly efficient separation within 30 min and showed good linearity in the range of 0.1 - 100 microg/L with the correlation coefficients of 0.991 0 - 0.999 9. The spiked recoveries were 57.2% - 120.3%. The intra-day relative standard deviations (RSDs) were between 0.3% and 24.7%, while the inter-day RSDs were between 0.6% and 29.9%. This method has good linearity, high sensitivity, high accuracy and precision. Also, it is simple, rapid and low solvent consumption. The low chemical background interference allowed it to be used in more complex matrices.