Determination of Four Chiral Pesticides in Soil by QuEChERS-Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

The enantiomer residues of metalaxyl, napropamide, triticonazole and metconazole were detected in soil by QuECh-ERS-ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The soil sample was extracted with acetonitrile containing 1% acetic acid and purified using QuEChERS method. Quantitative analysis for the enantiomers of these four chiral pesticides was performed in MS in multi-response monitoring (MRM) mode by external standard method. All enantiomers showed good linearity in the range of 0.5 to 50 μg/L. The average recoveries of enantiomers in soil were 81.74% to 105.79% with relative standard deviations (RSDs) from 3.69% to 7.86%. The method quantitative limit (MQL) was 5.3-30.3 ng/kg. The method can be used for rapid screening and determination of chiral pesticides in soil.