目的 研究食品用塑料包装材料中4种有害单体（1,3-丁二烯、丙烯腈、乙苯、苯乙烯）的顶空-气质联用检测方法。方法 塑料包装材料经液氮粉碎、顶空加热后，采用质谱检测器对顶空气体进行检测，通过标准物质扫描获得目标物定性、定量离子，通过标准曲线绘制对目标物进行定性定量。结果 1,3-丁二烯、丙烯腈在0.02~2 mg/mL，乙苯、苯乙烯在0.1~10 mg/mL范围内线性良好，方法检出限分别为0.05，0.05，0.02，0.02 mg/kg。对4种单体进行了加标回收试验，平均回收率在94.42%~106.07%之间，相对标准偏差为2.76%~5.91%。结论 建立了食品用塑料包装材料中4种有害单体的顶空-气质联用检测方法，该方法检出限更低，节省了样品的前处理时间，为食品包装用塑料材料中有害单体的快速检测提供了方法指导。

The work aims to study the HS-GC/MS for 4 kinds of harmful monomers (1,3-butadiene, acrylonitrile, ethylbenzene, styrene) in plastic packaging materials for food. After crushed with liquid nitrogen and heated by headspace, the plastic packaging materials were tested by mass spectrometer detector with the headspace air. The qualitative and quantitative ions of the target were obtained by scanning the reference material, and the target was qualitatively and quantitatively determined by the standard curve. The calibration curve of each monomer showed good linear relationship in the following concentrations: 1,3-butadiene, acrylonitrile: 0.02~2 mg/mL; ethylbenzene, styrene: 0.1~10 mg/mL. The detection limit of the method was 0.05, 0.05, 0.02 and 0.02 mg/kg, respectively. The recovery test of 4 monomers was conducted. The recovery rates of this method varied from 94.42% to 106.07% with relative standard deviations (RSDs) ranging from 2.76%~5.91%. The HS-GC/MS for 4 kinds of harmful monomers in plastic packaging materials for food is established. The proposed method has lower detection limit and less time in sample pretreatment, and it can serve as a guidance for rapid detection of harmful monomer in plastic materials for food packaging.