Determination of 17 volatile persistent organic pollutants in ambient air by thermal desorption-gas chromatography-triple quadrupole mass spectrometry with thermal desorption
A simultaneous detection method for 17 volatile persistent organic pollutants(V-POPs)in ambient air was established using thermal desorption(TD)combined with gas chromatography-triple quadrupole mass spectrometry(GC-MS/MS).The ambient air is collected and enriched through a thermal desorption tube,analyzed using GC-MS/MS in multi reaction monitoring(MRM)mode,and quantified using an external standard method.The results showed that Tenax TA filler thermal desorption tube had the best collection performance of 17 V-POPs.The 17 V-POPs exhibited good linearity in the range of 0.01 ng to 1 ng,with correlation coefficients(r2)greater than 0.999.When the sampling flow rate was 50 mL/min and the sampling volume was 6 L,the detection limits of the method were from 0.05 to 2 ng/m3.At the spiked levels of 0.01,0.1 and 1 ng,the recovery rates were between 72%and 124%,and the relative standard deviations(RSDs)were less than 15%.Actual measurements were conducted on the ambient air in Beijing,and 9 substances including hexachlorobutadiene(HCBD),monochlorobenzene(MCB),and dichlorobenzene(1,4-DCB)were detected.
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