Method for detecting imidacloprid metabolite in plant-derived food

The invention discloses a method for detecting imidacloprid and metabolites thereof in plant-derived food. The method comprises the following steps: S10, crushing to-be-detected plant-derived food, adding water and a formic acid acetonitrile solution into the crushed to-be-detected plant-derived food, carrying out stirring, carrying out ultrasonic extraction to obtain a mixed solution, adding sodium chloride into the mixed solution, performing centrifuging to obtain a first supernatant, and performing concentrating to obtain an intermediate solution; S20, adding a mixed solution containing potassium permanganate and sodium hydroxide into the intermediate solution, performing stirring and ultrasonic treatment, then adding anhydrous sodium sulfite into the intermediate solution, performing stirring to obtain a solution A, performing centrifugation on the solution A, reserving a supernatant, adjusting the pH value of the supernatant to 2-3, and adding water to a constant volume to obtain a derivatized sample; s3