植物油样品0.400 0 g，加混合内标溶液20 μL混匀，经乙腈4 mL超声提取15 min。离心后，提取液经活化的SILICA/PSA混合玻璃固相萃取柱净化。净化液经氮气吹干后，残渣用正己烷溶解并稀释至1.0 mL。待测液采用DB-5MS UI色谱柱进行气相色谱分离，采用电子轰击离子源和选择离子监测模式进行质谱分析，同位素内标法定量。16种邻苯二甲酸酯类化合物的线性范围均在0.01~1.00 mg·L^-1之间，检出限（3S/N）在0.003 0~0.035 mg·kg^-1之间，按标准加入法在3个浓度水平上进行回收试验，回收率在81.7%~113%之间，测定值的相对标准偏差（n=6）在2.8%~11%之间。

The sample of vegetable oil (0.400 0 g) was mixed with 20 μL of mixed internal standard solution, and the mixture was extracted ultrasonically for 15 min with 4 mL of acetonitrile. After centrifugation, the extract was purified on activated SILICA/PSA mixed glass SPE column. The purified solution was dried by N₂-blowing, and the residue was dissolved and dilued to 1.0 mL with hexane. DB-5MS UI column was used for gas chromatography separation. EI and SIM were adopted in MS, and isotope dilution internal standard method was used for quantification. Linearity ranges for 16 phthalates were obtained to be same between 0.01-1.00 mg·L^-1, with detection limits (3S/N) in the range of 0.003 0-0.035 mg·kg^-1. Test for recovery was made by standard addition at 3 concentration levels, giving results in the range of 81.7%-113%, with RSDs (n=6) ranged from 2.8% to 11%.