Weight management

What are the main components of sodium nitrite?

Sodium nitrite Molecular formula: NaNO2 Molecular weight: 69.00 Properties and uses: white or slightly yellow rhombic crystal, easily soluble in water and liquid ammonia, slightly soluble in methanol, ethanol, ether, strong moisture absorption, mordant for fabric dyeing; bleaching agent for silk and flax, metal heat treatment agent; steel corrosion inhibitor; antidote to cyanide poisoning, laboratory analytical reagent, used as a color agent, antimicrobial agent, and preservative in meat product processing. Density 2. 168g/cm3, melting point 271 ° C, decomposition at 320 ° C. Hygroscopic, easily soluble in water, stable aqueous solution, showing alkaline reaction, can absorb oxygen from the air, and form sodium nitrate. Sodium nitrite is toxic and carcinogenic. In the sodium nitrite molecule, the oxidation number of nitrogen is 3. It is an intermediate oxidation state, both reducing and oxidizing. For example, in an acidic solution, KI can be oxidized to elemental iodine: This reaction can be carried out quantitatively and can be used for the determination of nitrite. Sodium nitrite is widely used in the dye industry and organic synthesis. It is often used in the preparation of azo dyes, nitrogen oxides, drugs, rust inhibitors, printing and dyeing, bleaching, cured meat, etc. Because it is toxic, it must be paid attention to when using it. Sodium nitrite has high thermal stability and can be prepared by high temperature thermal reduction method: Pb (powder) NaNO3 = PbO NaNO2 product PbO is insoluble in water. After the reaction, the mixture is dissolved in hot water, filtered and recrystallized to obtain white crystalline sodium nitrite. The N in redox (NO2) – is 3 valent, so it has both oxidative and reductive properties. In acidic media: HNO2/NO = 0.99V, it has a strong oxidizing ability. 2 (NO2) – 2I- 4H ==2NO I2 2H2O Because there is NO in the acid, it is easy to obtain electrons into NO, so it is easy to oxidize I. This is the difference between nitrous acid and dilute nitric acid. The acidic solution of nitrate cannot oxidize I due to the above kinetic reasons. When encountering strong oxidizing agents, it is also reductive. 5 (NO2) – 2 (MnO4) – 6H ===== 5 (NO3) – (Mn) 2 3H2O is easily disproportionated when there is no oxidant and reducing agent. Sodium nitrite SodiumNitrite is also used as a food colorant and is used in meat foods. However, due to its carcinogenicity, it is not allowed to exceed the standard of sodium nitrite pharmacology: it can turn hemoglobin into methemoglobin, and the detoxification process of cyanide is intertwined with methylene blue, but the effect is stronger than methylene blue. It is suitable for the rescue of cyanide poisoning. Sodium nitrite is an important azo reagent. Its azo reaction with aromatic amines is one of the most commonly used reactions in the dye industry. It can also be used as a mordant, bleach, metal heat treatment agent, electroplating corrosion inhibitor, and is also used to make potassium nitrite. It has strong oxidation and weak reductivity under acidic conditions such as azo dyes. Sodium nitrite is an industrial salt. Although it is similar to table salt sodium chloride, it is toxic and cannot be eaten. Sodium nitrite is highly toxic. People who consume 0.2 grams to 0.5 grams may experience symptoms of poisoning. If they accidentally consume 3 grams at one time, they may cause death. Sodium nitrite poisoning is characterized by cyanosis. The symptoms and signs include headache, dizziness, fatigue, chest tightness, shortness of breath, palpitations, nausea, vomiting, abdominal pain, diarrhea, lips, nails and whole body skin, mucosal cyanosis, etc., and even convulsions, coma, and life-threatening in severe cases. If high-iron hemoglobin cyanosis occurs, methylene blue can be used to reduce high-iron hemoglobin. The reason why sodium nitrite can be poisoned by accidental consumption is that the iron contained in hemoglobin in the human body is ferrous, which can combine with oxygen and circulate with the blood to transport oxygen to various parts of the body. When ingested sodium nitrite by mistake, a chemical reaction occurs in the blood, causing hemoglobin to be converted into hemoglobin of trivalent iron. The hemoglobin of trivalent iron cannot carry oxygen, so it causes hypoxic poisoning in the human body. In addition, sodium nitrite is also a carcinogen. Therefore, ingesting sodium nitrite by mistake is very harmful to health. To distinguish sodium nitrite from table salt, you can put the sample into a sulfuric acid solution of potassium iodide and add starch. If it turns blue, it proves that the sample is sodium nitrite. The iron contained in hemoglobin in the human body is ferrous, which can combine with oxygen and circulate with the blood to transport oxygen to all parts of the body. When ingested sodium nitrite by mistake, a chemical reaction occurs in the blood, causing hemoglobin to be converted into hemoglobin of trivalent iron. The hemoglobin of trivalent iron cannot carry oxygen, so it causes hypoxic poisoning in the human body. It is produced as a food additive according to the GB1907 national standard and added according to the amount specified in GB2760. The maximum amount used in meat is 0.15g/kg. The residual amount of sodium nitrite in meat shall not exceed 0.05g/kg in cans; meat products shall not exceed 0.03g/kg. The standard for safe intake of sodium nitrite by the human body issued by the World Scientific Committee on Food Hygiene in 1992 is 0 to 0.1g/kg body weight; if converted to nitrite, the standard is 0 to 4.2g/60kg body weight. If used and eaten according to this standard, it will not cause harm to the human body. Sodium nitrite is toxic. The toxic side effect of excessive consumption is to paralyze the vascular movement center, respiratory center and surrounding blood vessels, and form methemoglobin. Acute poisoning manifests as general weakness, headache, dizziness, nausea, vomiting, diarrhea, chest urgency, and breathing difficulties; the skin and mucous membranes are obviously cyanotic. In severe cases, blood pressure drops, coma, and death. In addition, sodium nitrite can also produce carcinogens in the human body. Newly submerged kimchi also contains sodium nitrite (so kimchi is best eaten after 15 days after submersion, and the nitrite content in it will gradually decrease).

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