Method for detecting nitrofuran drug in eel

The invention relates to a method for detecting a nitrofuran drug in eel. The method comprises the following steps: weighing 4 g of an eel sample, adding 20 ml of a hydrochloric acid solution with concentration being 0.2 mol/L, adding 1 ml of a derivating agent, uniformly shaking with hands, performing a water-bath reaction at the temperature of 60 DEG C for 1 h, taking the sample out and coolingthe sample to room temperature, using a NaOH solution for adjusting the pH value to 7.0-7.5, performing centrifugation for 10 min, taking a half of a supernatant, using 5 ml of methanol and 5 ml of distilled water, activating a solid-phase extraction column; separating the supernatant by a column, using 5 ml of distilled water for leaching, removing a leacheate, using 2 ml of methanol for elutinga solid-phase extraction column, collecting an eluate, drying the material with nitrogen at the temperature of 40 DEG C, using 1 ml of a furan solution for dissolving, filtering the material by a microfiltration membrane, and