采用气相色谱-串联质谱法测定白酒中16种增塑剂的含量。样品经30 ℃水浴真空旋转蒸发10 min去除乙醇后,用正己烷萃取,漩涡振荡1 min,取上层有机相用TR-5MS色谱柱分离,选择反应监测扫描(SRM)模式测定。16种增塑剂的质量浓度在5~1 000 μg·L-1范围内与其峰面积呈线性关系,检出限(3S/N)在5~15 μg·kg-1之间。在50,100,500 μg·kg-1等3个浓度水平进行加标回收试验,回收率在70.5%~120%之间,相对标准偏差(n=6)小于15%。

GC-MS/MS was applied to the determination of 16 plasticizers in white spirit. Alcohol in the sample was removed by vacuum rotary evaporation for 10 min in 30 ℃ water bath, then the sample was extracted with n-hexane and vortex oscillated for 1 min．The extract was separated with TR-5MS column,and selected reaction monitoring mode was adopted in MS/MS determination. Liner relationships between values of peak area and mass concentration of the 16 plasticizers were kept in the range of 5-1 000 μg·L-1,with detection limits (3S/N) in the range of 5-15 μg·kg-1．Tests for recovery were made at 3 concentration levels of 50,100 and 500 μg·kg-1, giving values of recovery and RSD′s (n=6) in the ranges of 70.5%-120% and less than 15% respectively.