Method for removing residual diatom in microwave digestion tank by using low-toxicity acid

The invention discloses a method for removing residual diatom in a microwave digestion tank by using low-toxicity acid. Comprising the following steps: (1) adding a phosphoric acid solution into a microwave digestion tank; (2) putting the microwave digestion tank into a microwave digestion instrument, and carrying out microwave cleaning; and (3) taking out the microwave digestion tank which is composed of a digestion tube and a digestion cover, carrying out pure water flushing, low-concentration alkaline solution flushing, low-concentration acid solution flushing and pure water flushing on the digestion tube and the digestion cover respectively, and finally drying for later use. A diatom inspection standard GA/T1662-2019 adopts an HF microwave cleaning method or a NaOH solution immersion cleaning method, HF has great harm to a human body, and the NaOH solution immersion cleaning method can only clean a digestion tube; compared with the prior art, the method has the advantages that the used reagent is low in t