亚硝酸钠是一种工业用盐,广泛地用于制造偶氮燃料、药物、印染、漂白和防锈等工业生产,还作为防冻剂用于建筑工程。从外观看它与食盐相似,是白色或微黄色晶体,有咸味,溶于水,但毒性很大,一个人只要进食0.2～0.5克就会引起中毒,进食3 Sodium nitrite, an industrial salt, is widely used in the industrial production of azo fuels, pharmaceuticals, printing and dyeing, bleaching and rust prevention, and also as an antifreeze for construction. It looks similar to salt from the outside, is white or yellowish crystals, salty, soluble in water, but very toxic, as long as a person eating 0.2 to 0.5 grams can cause poisoning, eating 3