采用高效液相色谱-串联质谱法测定蔬菜中杀虫磺的残留量。称取样品的匀浆10.00 g，用乙腈提取3次（每次20 mL），合并提取液并将其蒸缩至约5 mL。此溶液通过TPT固相萃取柱净化，保留流出液（主液）。用乙腈-甲苯（3+1）混合液25 mL淋洗固相萃取柱，淋出液与主液合并，先在45℃水浴浓缩至约5 mL，再于35℃水浴上吹氮蒸干。用甲酸-乙腈（0.1+99.9）混合液溶解残渣并定容至10 mL。按所选条件进行高效液相色谱-串联质谱法分析。杀虫磺的质量浓度在1~500 μg·L^-1内与其对应的峰面积呈线性关系，不同基质中杀虫磺的检出限（3S/N）为0.1~0.4 μg·kg^-1。以空白样品为基体进行加标回收试验，所得回收率为48.0%~97.7%，测定值的相对标准偏差（n=6）为1.8%~12%。

HPLC-MS/MS was applied to the determination of residual amount of bensultap in vegetables. Homogenized pulp (10.00 g) of the sample was taken and extracted thrice with CH₃CN (20 mL each). The combined extract was evaporated to about 5 mL. The solution was then purified by passing through TPT SPE column. The eluate (main) was reserved. The SPE column was rinsed with 25 mL of a mixture of CH₃CN and toluene (3+1). The eluate was combined with the main eluate, and evaporated first to about 5 mL at 45℃ in a water bath and then to dryness by N₂-blowing at 35℃ in the water bath. The residue was taken up and made up to 10 mL with a mixture of formic acid-CH₃CN (0.1+99.9). The solution was then analyzed by HPLC-MS/MS under the condition described. Linear relationship between values of peak area and mass concentration of bensultap was kept in the range of 1-500 μg·L^-1, with detection limit (3S/N) of bensultap in different matrixes in the range of 0.1-0.4 μg·kg^-1. On the base of blank sample, test for recovery was made by standard addition method. Values of recovery found were in the range of 48.0%-97.7%, with RSD's (n=6) in the range of 1.8%-12%.