取2支卷烟滤嘴称重，经水20 mL浸润之后，加入乙醇20 mL和10.0 g·L^-1内标溶液50 μL，超声提取30 min，取上清液2 mL经正己烷5 mL萃取，所得溶液采用气相色谱-串联质谱法（GC-MS/MS）测定其中18种邻苯二甲酸酯的含量，内标法定量。质谱分析中采用电子轰击离子源和多反应监测模式。18种邻苯二甲酸酯的线性范围均为0.20~10 mg·L^-1，检出限（3S/N）为0.03~0.50 mg·kg^-1。按标准加入法进行回收试验，回收率为86.8%~107%，相对标准偏差（n=6）均小于7.0%。

After 2 cigarette filters weighted were soaked with water of 20 mL, ethanol of 20 mL and 10.0 g·L^-1 internal standard solution of 50 μL were added and the mixture was extracted ultrasonically for 30 min. The supernatant of 2 mL was extracted by n-hexane of 5 mL.18 phthalate esters in the above solution were determined by gas chromatography-tandem mass spectrometry (GC-MS/MS), and the internal standard method was adopted for quantification. EI and MRM mode were adopted in MS analysis. Linear ranges of 18 phthalate esters were all 0.20-10 mg·L^-1, with detection limits (3S/N) ranged from 0.03 mg·kg^-1 to 0.50 mg·kg^-1. Test for recovery was made by standard addition method, giving results in the range of 86.8%-107%, with RSDs (n=6) all less than 7.0%.