Method for rapidly determining general sample sodium benzoate content in food

The method comprises the following steps: taking a to-be-detected sample, putting the to-be-detected sample into a centrifuge tube with a plug, adding water, carrying out vortex uniform mixing, carrying out 50 DEG C water bath ultrasonic treatment, and cooling to room temperature to prepare a solution A; adding organic salt and an anti-caking agent for food into the solution A, uniformly mixing, transferring into a centrifuge tube, centrifuging, transferring a water phase into a volumetric flask, adding water into residues, performing vortex uniform mixing, performing ultrasonic treatment, centrifuging, transferring the water phase into the same volumetric flask, fixing the volume to the scale by using water, and uniformly mixing to obtain a solution B; standing the solution B until a supernatant B1 and a lower residue B2 appear, taking the supernatant B1, and filtering with a filter membrane to obtain a sample solution C; preparing an ammonium acetate solution, and placing at room temperature for 4-5 days; a