建立同时测定聚甲基丙烯酸甲酯（PMMA）塑料中6种苯并三唑类紫外线吸收剂含量的基质匹配-外标定量的气相色谱质谱法。将样品剪碎，用甲苯-二氯甲烷（体积比1∶1）混合溶剂超声萃取，正己烷沉淀，经0.22 μm有机滤膜净化过滤后，采用TG-5毛细管色谱柱，不分流进样，全扫描模式进样，气相色谱质谱仪测定，基质匹配-外标法定量。对提取溶剂、时间、基质效应等对比分析，优化质谱参数，研究基质效应变化规律。6种苯并三唑类紫外线吸收剂可以很好地分离，定量准确。在3种浓度加标水平下，回收率为85.4%~104.0%，相对标准偏差为0.7%~5.1%，相关系数在0.996 0以上，检出限为0.7~1.6 mg/kg。该方法操作简单高效，采用基质匹配-外标法定量，结果准确度更高，适用于PMMA塑料中6种紫外线吸收剂含量的准确测定。

A matrix matching-external standard quantification method was established for the simultaneous determination of the content of six kinds of benzotriazole ultraviolet absorbers in polymethyl methacrylate (PMMA) plastics. The samples were cut up, extracted using ultrasonic extraction with a mixed solvent of toluene and dichloromethane(volume ratio 1∶1), and then precipitated with n-hexane. After purification and filtration by 0.22 μm organic filter membrane, TG-5 capillary column was used with unsplit stream sampling. The samples were imported by full scan mode, determined by gas chromatography and mass spectrometer, and quantified by matrix matching and external standard method. The extraction solvent, time and matrix effect were analyzed, and the mass spectrum parameters were optimized. Six kinds of benzotriazole ultraviolet absorbers could be separated well and quantified accurately. The recoveries were 85.4%~104.0%, the relative standard deviations were 0.7%~5.1%, the correlation coefficients were above 0.996 0, and the detection limits were 0.7~1.6 mg/kg. The method is simple and efficient, using matrix-matched external standard quantification, which provides higher accuracy, and is suitable for the accurate determination of the content of six ultraviolet absorbers in PMMA plastic.