Since nitrite is easily oxidized by oxygen to form nitrate, the mass difference ΔM is obtained by weighing before and after heating. It can be seen that the mass increase of 1 mole of nitrite after oxidation is 16g, so the amount of nitrite can be obtained from ΔM/16.

Therefore the mass of nitrite is 85*ΔM/.

Nitrite can be converted into nitrite by eating cured meat products, pickles and spoiled vegetables with high nitrate or nitrite content. Pickles and kimchi can also produce nitrite, but the peak production occurs on the seventh day of pickling. If eaten after half a month, the nitrite in them will be greatly reduced.

Extended information:

Nitrite poisoning refers to poisoning caused by eating pickled meat products, pickles and spoiled vegetables with high nitrate or nitrite content, or It is caused by mistakenly eating industrial sodium nitrite as table salt. It can also be seen after drinking bitter well water or steamer water containing nitrate or nitrite. Nitrite can oxidize the low-iron hemoglobin that normally carries oxygen in the blood into high-iron. Hemoglobin.

As a result, it loses its oxygen-carrying capacity and causes tissue hypoxia. Nitrite is a highly toxic substance. Ingestion of 0.2 to 0.5 grams by adults can cause poisoning, and 3 grams can cause death.

Nitrite is also a carcinogen. According to research, esophageal cancer is positively correlated with the amount of nitrite ingested by patients. The carcinogenic mechanism of nitrite is: nitrite is exposed to gastric acid and other environments Salt reacts with secondary amines, tertiary amines and amides in food to form N-nitrosamines, a strong carcinogen. Nitrosamines can also enter the fetus through the placenta and have teratogenic effects on the fetus.

Baidu Encyclopedia-Nitrite

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