Because the main components of industrial salt and edible salt are sodium chloride, there is no big difference in taste, and the amount of salt used as a seasoning in cooking is limited, so the harm of industrial salt to human body is mostly a chronic process. For example, industrial salt may contain impurities such as lead, arsenic, mercury, cadmium and nitrite, and long-term accumulation of heavy metals may cause dizziness, dermatosis, myocardial injury, neuritis, multiple organ dysfunction and muscle spasm.
When a large amount of nitrite enters the human body, the low-iron hemoglobin carrying oxygen in the body can be turned into methemoglobin. As soon as methemoglobin meets oxygen, it is firmly combined and difficult to separate. In this way, the whole body tissue of the human body will be deprived of oxygen. When the human body ingests 0.3 ~ 0.5 grams of nitrite, it can cause acute poisoning and 3 grams can kill people. Once the human body is poisoned, it will come on in ten minutes, and symptoms such as dizziness, head swelling, tinnitus, general weakness, numbness in hands and feet, nausea and vomiting, diarrhea, dyspnea, etc. will occur, and in severe cases, convulsions and coma will occur. Of course, the consumption of industrial salt alone is less than the amount of acute nitrite poisoning.
As early as 20 10, china food and drug administration published an article entitled "Correctly Understanding Edible Salt and Industrial Salt", which not only clearly pointed out that it is strictly forbidden to use industrial salt instead of edible salt, but also mentioned that industrial salt contains a large amount of nitrite, and human intake of 0.2-0.5g of nitrite will cause poisoning; Ingestion of 3 grams of nitrite can cause death.
A large amount of sodium chloride is needed in the organic synthesis industry of industrial salt. In addition, it is also used in soap manufacturing, ceramics, glass production, daily chemical industry, oil drilling, drilling working fluid, completion fluid, petrochemical dehydration fluid, early strength agent in construction industry, coagulant for coating production, latex coagulant in rubber industry, additive in paper industry and deinking of waste paper, inorganic chemical raw materials and sulfate remover in chemical industry, coagulant of sodium alginate, prevention and treatment of decay of wheat, apples and cabbage, and preparation of food preservatives. Salt is also widely used in water treatment, highway snow removal, refrigeration and refrigeration.