建立了苯乙烯不对称环氧化反应的气相色谱-质谱／选择离子监测（GC-MS／SIM）筛选方法。以乙苯为内标，利用 GC-MS／SIM对苯乙烯环氧化反应样品进行分析，在选定的分析条件下完全分离并准确测定了苯乙烯和环氧苯乙烷对映异构体的含量，同时利用该方法对苯乙烯环氧化反应的正交试验进行了评估。该方法具有以下优点：高精密度（以 RSD表示的精密度为1.2％~5.2％，n=5）、良好的线性关系（苯乙烯、（ R）-环氧苯乙烷和（ S）-环氧苯乙烷标准曲线的相关系数分别为0.9997、0.9932和0.9963）、低定量限（苯乙烯、（ R）-环氧苯乙烷和（ S）-环氧苯乙烷的定量限分别为1.3、1.1和0.7 mg／L）以及合理的回收率（98.2％~108.2％）。该方法为苯乙烯及其同系物的不对称环氧化反应提供了一种新的分析测定途径。
A screening method by gas chromatography-mass spectrometry( GC-MS)with selected ion monito-ring( SIM)has been developed for asymmetric epoxidation of styrene. All samples were analyzed by GC-MS with the mode of SIM by using ethylbenzene as the internal standard,by which styrene and styrene epoxide enantiomers were completely separated and their concentrations were accurately determined. Furthermore,this method was used to evaluate the epoxidation reaction of styrene,which was optimized by orthogonal experi-ment. The advantages of the method are as follows:excellent precision( RSD in the range of 1. 2%-5. 2%,n=5),good linearity( the correlation coefficients for styrene,( R)/( S)-styrene oxide were 0. 999 7,0. 993 2 and 0. 996 3,respectively),low limits of quantitation( LOQs of styrene,( R)/( S)-styrene oxide were 1. 3,1. 1 and 0. 7 mg/L,respectively)and reasonable recoveries( 98. 2%-108. 2%). All in all,the method provided a new way to determine the asymmetric epoxidation mixture of styrene and its homologs.
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