加速溶剂萃取/气相色谱-三重四极杆质谱法测定大气中苯并三唑类紫外吸收剂OA

In this study,a sensitive and reliable analytical method was established for the simultane-ous determination of gaseous and particulate benzotriazole ultraviolet absorbers(BUVs)in ambient air.The target analytes included four common BUVs:UV-320,UV-326,UV-327,and UV-328.Specifically,a high-volume air sampler was used to collect gaseous and particulate BUVs sepa-rately,with quartz fiber filters(QFF)for particulate phase and polyurethane foam(PUF)/XAD-2 res-in for gaseous phase.Air samples were extracted by accelerated solvent extraction,purified by silica cartridges,and analyzed by gas chromatography-triple quadrupole mass spectrometry.Method vali-dation experiments were carried out to evaluate the performance of the established method,and the results showed that the four target compounds exhibited a good linear relationship in the concentration range of 1-200 ng/mL,with correlation coefficients(r)all greater than 0.999.The method detection limits ranged from 0.4 to 0.5 pg/m3,and the quantitation limits ranged from 1.6 to 2.0 ng/m3,which was sufficiently low to detect trace levels of BUVs in ambient air.The recoveries of the target analytes in QFF,PUF,and XAD-2 samples were 83.0％-103％,74.9％-108％,83.4％-96.0％,and the relative standard deviations(RSDs)were less than 10％for all target analytes,respectively.The method was used to monitor BUVs in ambient air samples of Beijing,and UV-326 and UV-328 were detected with concentration range of 0.9-6.8 pg/m3,while UV-320 and UV-327 were not de-tected in any samples.The established method is highly sensitive and accurate,which can fully meet the monitoring requirements for trace BUVs in the ambient atmosphere.It not only provides a reliable analytical tool for further in-depth research on the environmental behavior and ecological risks of BU-Vs in the atmospheric environment but also lays a solid foundation for the environmental monitoring and risk control of BUVs.