Determination of 105 pesticide residues in vegetables by QuEChERS-liquid chromatography-tandem mass spectrometry

After optimization of the QuEChERS pretreatment method, combined with liquid chromatography. tandem mass spectrometry (LC-MS/MS) technology, a multi. residue determination method was established for 105 typical insecticides, bactericides, herbicides, and plant growth regulators in vegetables. The target compounds were extracted by acetonitrile, purified with 150 mg primary secondary amine (PSA), 150 mg EC-C18, and 30 mg graphitized carbon black (GCB) adsorbents. The standard curves of 105 target compounds were linear in the con. centration range of 0.010-0.200 mg/L, with correlation coefficients (r) > 0.99. The limit of quantification was 0.010 mg/kg, the recoveries were between 6..2% and 108% at three spiked levels, and the RSDs of the method were between 1.02% and 11.8%. The method is suitable for the rapid determination of the common pesticides in vegetables owing to its advantages of rapidity, simplicity, and better purification.