The main ingredient is sodium chloride.
Table salt refers to sea salt, well salt, mine salt, lake salt and earth salt from different sources. Their main ingredient is sodium chloride, and the state regulations stipulate that the sodium chloride content of well salt and mine salt should not be less than 95%.
The table salt contains barium salt, chloride, magnesium, lead, arsenic, zinc, sulfate and other impurities. We stipulate that the content of barium shall not exceed 20mg/kg. too much magnesium and calcium in salt can make the salt with a bitter taste, and too much fluoride can also cause poisoning.
In recent years, many tests have confirmed that salt intake and the incidence of hypertension have a certain relationship, dietary salt intake is too much, can cause hypertension. The World Health Organization (WHO) recommends a daily intake of 5g of salt per person to prevent coronary heart disease and hypertension. China's adult daily intake of 6g salt to meet the body's need for sodium.
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Expanded Information: Physiological Roles: 1, Maintaining osmotic pressure of extracellular fluid Na and Cl are the ions; K and HPO4 are the main ions that maintain the osmotic pressure of the intracellular fluid. Of the total cations in the extracellular fluid, Na accounts for more than 90%, and of the total anions, Cl accounts for about 70%. Therefore, salt plays an important role in maintaining osmotic pressure and influences the movement of water in the body. 2, involved in the regulation of acid-base balance in the body Sodium bicarbonate, formed from Na and HCO3, has a buffering effect in the blood.There is also an equilibrium between Cl and HCO3 between the plasma and the blood erythrocytes.When the HCO3 permeates out of the blood erythrocytes, the anions in the blood erythrocytes are reduced, and Cl enters into the blood erythrocytes in order to maintain the balance of the electrical properties. The reverse is also true. 3, Chloride ions are involved in the production of gastric acid in the body Gastric juice is strongly acidic, with a pH of about 0.9 to 1.5, and its main components are pepsin, hydrochloric acid, and mucus. Mural cells in the gastric body glands are capable of secreting hydrochloric acid. The mural cells put HCO3 into the bloodstream, while secreting H into the gastric juice. This is when Cl enters the gastric juice from the blood via the mural cells to maintain electrical balance. Such strong hydrochloric acid in the stomach why can not erode the stomach wall it, Because the gastric body glands have a mucus cells, secreted mucus in the gastric mucous membrane surface to form a layer of about lmm ~ 1.5mm thick mucus layer, this mucus layer is often referred to as the gastric mucous membrane of the barrier, in the acid attack, the gastric mucous membrane is not digested by peptic enzymes and the formation of ulcers. But drinking alcohol can weaken the barrier effect of the gastric mucosa, often increasing the possibility of causing gastric ulcers. Reference: