提出了顶空固相微萃取-气相色谱-质谱法测定食用植物油中35种挥发性有机物(VOC's)含量的方法。为使固相微萃取达到更高的效率，选用75 μm碳分子筛-聚二甲基硅氧烷纤维作为微萃取的涂层，萃取温度及时间为90℃和30 min。用DB-5MS毛细管色谱柱分离，电子轰击离子源全扫描监测模式检测。35种VOC's在一定的质量浓度范围内与其峰面积呈线性关系，方法的检出限(3S/N)在0.03～6.84 μg·L-1之间。在3个添加水平上做回收试验，加标回收率在91.0％～108.3％之间，相对标准偏差(n=5)小于10％。%GC-MS with headspace-solid phase micro-extraction (HS-SPME) was applied to the determination of 35 volatile organic compounds (VOC's) in edible vegetable oil. To attain a higher efficiency in SPME, the 75μm carboxen/polydimethylsiloxaneC CAR/PDMS) fiber as coating was selected for the micro-extractor, and the extraction was carried out at 90℃ for 30 min. The analyte were separated on DB-5MS capillary column and detected by El ion source with whole scanning monitoring mode. Linear relationships between values of peak area and mass concentration of 35 VOC s were kept in definite ranges. Detection limit (3S/N) found were ranged from 0. 04 to 6. 84 μg ? L-1. Tests for recovery were performed by addition of mixed standard of 35 VOC's at 3 concentration levels for 5 parallel determinations, results of average recovery found were in the range of 91. 0% -108. 3% with RSD's (n=5) less than 10%.
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