Sodium nitrite: nitrite ion ionizes with sodium and the obtained inorganic salt.
Glauber's salt: Glauber's salt crystal of sulfate mineral, which is refined after processing. Sodium sulfate aqueous solution
2. Different storage conditions
Sodium nitrite: It should be stored in a low temperature, dry and ventilated warehouse. Doors and windows are tightly closed to prevent direct sunlight. Isolated from organic matter, flammable materials and reducing agents, and isolated from fire. Mirabilite: sealed, stored below 30℃, windproof.
Step 3: Different shapes
Sodium nitrite: white or yellowish rhombic crystal or powder. Glauber's salt: prismatic, rectangular or irregular block and granular. Colorless transparent or white-like translucent. Brittle and fragile, with a glass-like luster on the cross section. Slight breath and salty taste.
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Extended data:
Sodium nitrite is an industrial salt. Although it is similar to salt and sodium chloride, it is toxic and inedible. Sodium nitrite is highly toxic. People may have poisoning symptoms if they eat 0.2 g to 0.5 g, and they may die if they eat 3 g by mistake once. Sodium nitrite poisoning is characterized by cyanosis, and its symptoms and signs include headache, dizziness, fatigue, chest tightness, shortness of breath, palpitation, nausea, vomiting, abdominal pain, diarrhea, cyanosis of lips, nails, skin and mucous membranes, even convulsions and coma, and even life-threatening in severe cases.
Sodium nitrite is widely used in curing meat. If _ methemoglobin is cyanotic, methylene blue can be used to reduce _ methemoglobin. The reason why sodium nitrite is poisoned by mistake is because the iron contained in hemoglobin in human body is ferrous, which can combine with oxygen and transport oxygen to all parts of the body with blood circulation. When sodium nitrite is eaten by mistake, there will be a chemical reaction in the blood, which will convert hemoglobin into iron hemoglobin.
Hemoglobin of ferric iron can't carry oxygen, so it causes hypoxia poisoning in human body. Therefore, eating sodium nitrite by mistake is very harmful to health. As a food additive, it is produced according to GB 1907 and added according to GB2760. The maximum dosage in meat is 0. 15g/kg, and the residue of sodium nitrite in meat should not exceed 0.05g/kg；. . Meat products shall not exceed 0.03g/_.
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