Method for synchronously detecting couch grass, pyributali, pentnitrophenol, acarfol and toxophenol in tea leaves

The invention belongs to the technical field of pesticide residue detection, and discloses a method for synchronously detecting couch grass, pyribuvos, pentnitrophenol, acarfol and chlorthaphol in tea leaves. Carrying out vortex mixing extraction by adopting a mixed solution of water, formic acid and acetonitrile, adding sodium chloride, carrying out vortex uniform mixing, and centrifuging; taking supernatant liquid, adding anhydrous magnesium sulfate, GCB and C18 powder, carrying out vortex mixing and purification, and centrifuging; controlling the ratio of the tea leaf sample to the water to the formic acid to the acetonitrile to the sodium chloride to be 1g: (5-7.5) mL: (0.10-0.15) mL: (10-15) mL: (2-3); through the specific treatment method, impurities can be removed, and only the target product is reserved. The detection limit of an instrument for detecting the five pesticides is 0.1-0.8 ng/mL, the detection limit of the method is 0.1-0.8 mu g/kg, and the correlation coefficient R2 is greater than or equ