GC-MS法测定聚苯乙烯食品餐盒中苯乙烯及乙苯残留量

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中图分类号：TS207.3 文献标志码：A 文章编号：1674-0270（2025）35-0098-03

Determination of Styrene and Ethylbenzene Monomer Residues in Polystyrene Food Containers by GC-MS

WANG Xinzhu,LIUChunshen (Nanchong Product Quality Supervision and Inspection Institute, Nanchong 637Ooo, China)

Abstract:To establish an eficient,sensitive,and interference-resistant detection method for monitoringthe risk of styrene and ethylbenzene monomer residues in polystyrene (PS) food contact materials and products,this study optimized pretreatment conditions and employed gas chromatography-mas spectrometry (GC-MS) for quantitative analysis.Experiments compared the effects of different extraction solventsand ultrasonication times on extraction efciency.The final pretreatment method involved dissolving samples in dichloromethane and precipitating polymer matrices with methanol,folowed by detection in SIM mode.Styrene and ethylbenzene exhibit good linear relationships within the concentration range of 0.01mg/L to 1.0mg/L , with R2 exceeding 0.999. The method's LOD is 0.05 mg/kg, and the LOQ is 0.15mg/kg . The mean spiked recovery rates at low,medium,and high spiking levels range from 88.2% （204号 to 104.5% , with relative standard deviations ( SRSD )below 4.5% . Application of this method to commercially available polystyrene fod containers demonstrates its ability to overcome complex matrix interferences,yielding accurate and reliable data.This study provides robust technical support forfood safety regulation and product qualitycontrol in relevant industries.

Key Words: gas chromatography-mass spectrometry (GC-MS); polystyrene; styrene; ethylbenzene; monomer residues; sample pretreatment optimization

聚苯乙烯材料在食品接触材料及制品领域应用广泛，然而聚合物基体难免残留苯乙烯单体和乙苯。（剩余4750字）