Determination of 18 polychlorinated biphenyls in PM2.5 by ultrasonic extraction-gas chromatography-tandem mass spectrometry
Objective To establish a method for simultaneous determination of 18 polychlorinated biphenyl compounds in atmos-pheric fine particulate matter(PM2.5).Methods Surrogates were added to PM2.5 quartz fiber filter samples for ultrasonic-assisted ex-traction,column purification,and quantification by gas chromatography-tandem mass spectrometry with internal standards.Results For the 18 polychlorinated biphenyls,the linear ranges were 1.8-45.0 μg/L,with good linearity(correlation coefficients r＞0.997);the detection limits were 0.2-2.0 pg/m3;the quantitation limits were 0.8-8.0 pg/m3;the recovery rates spiked at low,medium,and high concentrations were 64.6％-112.0％,and the relative standard deviations were 4.02％-10.90％.Conclusion The established method is simple,sensitive,stable,and reliable,which can meet the requirements for simultaneous measurement of 18 polychlorinated biphenyl compounds in atmospheric PM2.5.
polychlorinated biphenylgas chromatography-tandem mass spectrometryultrasonic extractionfine particulate mat-ter
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