抗氧剂168标准品及将其添加到聚丙烯薄膜中，经过紫外或微波处理均会发生降解，产生降解产物。以正己烷为提取溶剂，建立了聚丙烯薄膜中抗氧剂168及其降解产物2,4-二叔丁基苯酚和三(2,4-二-叔丁基苯基)磷酸酯的气相色谱-质谱检测方法。结果表明：三种物质分别在25~150 mg/L，0.02~20 mg/L，0.05~10 mg/L的浓度范围内线性关系良好，R2分别为0.9990、0.9989、0.9955，回收率在81.83~115.21%之间，RSD在0.10~4.54%之间，检出限（LOD）分别为5.00 μg/L，0.20 μg/L和25.00 μg/L，定量限（LOQ）分别为12.00 μg/L，0.45 μg/L和60.00 μg/L，可见该方法精密度好，灵敏度高，定性定量准确，可用于聚丙烯中抗氧剂168及其两种降解产物的检测。将抗氧剂168添加到聚丙烯中经紫外、微波处理，降解率分别为31.88%、11.79%，产生3个降解产物，由标品确定其中两个为2,4-二叔丁基苯酚和三(2,4-二-叔丁基苯基)磷酸酯，推测另一个为抗氧剂168失去一个双叔丁基苯酚的产物；抗氧剂168标准品经紫外或微波处理，降解率均在5%以下。

Tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168) alone and the Irgafos 168 added in the polypropylene (PP) films for food packing materials can generate degradation products under ultraviolet or microwave treatment. With n-hexane as the extraction solvent, a gas chromatography-mass spectrometry (GC-MS) method was developed for detecting Irgafos 168, and determining its degradation products, 2,4-di-tert-butylphenol and tris(2,4-di-tert-butylphenyl)phosphate, in PP food packing materials. The results showed that the calibration curves of three substances had a good linearity in the ranges of 25~150 mg/L, 0.02~20 mg/L, and 0.05~10 mg/L respectively, and the R2 values were 0.9990, 0.9989, and 0.9955, respectively. The spike recoveries at different spike concentration levels were in the range of 81.83~115.21% with RSD values in the range of 0.10~4.54%. The limits of detection (LOD) were 5.00 μg/L, 0.20 μg/L, and 25.00 μg/L, respectively, and the limits of quantitation (LOQ) were 12.00 μg/L, 0.45 μg/L, and 60.00 μg/L respectively. Therefore, this method is precise, highly sensitive, and accurate, and can be applied for detecting Irgafos 168, 2,4-di-tert-butylphenol, and tris(2,4-di-tert-butylphenyl)phosphate in PP. Irgafos 168 was added to PP, followed by ultraviolet and microwave treatments. The corresponding degradation rates were 31.88% and 11.7%, respectively, and three degradation products were generated. According to the standards, two of these degradation products were identified as 2,4-di-tert-butylphenol and tris(2,4-di-tert-butylphenyl)phosphate, and the other was speculated to be the result of Irgafos 168 with loss of the di-tert-butylphenol group. The degradation rate of Irgafos 168 standard was less than 5% under ultraviolet or microwave treatment.

国家质检总局科技计划项目（2014IK078）；国家自然科学基金（31571762，21277061）