Sodium chloride is widely distributed in nature. Oceans are the vast source of sodium chloride. It occurs in seawater at an average concentration of 2.68 wt%. It also occurs in many inland saline waters and in salt deposits in sedimentary rocks, as the mineral halite.
Sodium chloride is probably the most important salt of both sodium and chlorines. Sodium chloride, common table salt, is an essential component of most food preparation, imparting flavor to food and providing the sodium nutritional requirement. Also, it is used for preserving food. Therapeutically, NaCl solution is used to combat dehydration as an electrolyte replenisher, and it is an emetic.
| TEST ITEMS | TEST STANDARD |
| REFINED SALT | SEA SALT |
| SUPERIOR | FIRST LEVEL | SECOND LEVEL | SUPERIOR | FIRST LEVEL | SECOND LEVEL |
| SODIUM CHLORIDE(%≥) | 99.1 | 98.5 | 97.5 | 96.2 | 94.8 | 92.0 |
| MOISTURE(%≤) | 0.30 | 0.50 | 0.80 | 2.80 | 3.80 | 6.00 |
| WATER INSOLUBLE(%≤) | 0.05 | 0.10 | 0.20 | 0.20 | 0.30 | 0.40 |
| CALCIUM&MAGNESIUM(%≤) | 0.25 | 0.40 | 0.60 | 0.30 | 0.40 | 0.60 |
| SULFATE%(≤) | 0.30 | 0.50 | 0.90 | 0.50 | 0.70 | 1.00 |
Sodium chloride-character
This product is colorless, transparent cubic crystal or white crystalline powder; Odorless and salty.
This product is soluble in water and almost insoluble in ethanol.
Sodium chloride-introduction
Soluble in water and glycerol, slightly soluble in alcohol. At 25℃, 1g is soluble in 2.8ml water, 2.6ml boiling water and 10ml glycerol, and slightly soluble in ethanol. Its solubility in water is reduced by the presence of hydrochloric acid, and it is almost insoluble in concentrated hydrochloric acid. The median lethal dose (oral) of rats was 3.75+/-0.43g/kg.
Sodium chloride-use
Rock salt is mainly used as edible salt (i.e., flavoring agent) and food preservative, and part of it is used as animal feed, and it is also an important chemical raw material, used to make alkali, hydrochloric acid and chlorine gas, and can also extract metal sodium.
Sodium chloride-safety
There are two kinds of industrial salt: bagged salt and bulk salt. Each bag weighs 50kg. The products should be properly sealed, kept clean and dry, and protected from moisture. Edible salt is packed in cartons, woven bags and sacks lined with food plastic bags; Small packages have a net weight of 500g or 1000g per bag, woven bags and sacks have a net weight of 25kg or 50kg; per bag; The packaged edible salt should be attached with a quality certificate, and the small packaging mark of edible salt sold should be implemented according to GB 7718. The means of transport of industrial salt and edible salt must be clean and dry, and it is forbidden to mix them with goods that can cause salt pollution. When transporting, there should be a cover to prevent rain, leakage and other impurities from mixing.