Boric Acid

Boric Acid

Boric acid, with the chemical formula H₃BO₃, is a white powdery crystal or a scaly shiny crystal with a triclinic axis. It feels slippery and has no taste. It is soluble in water, alcohol, glycerin, ether and essential oils, and the aqueous solution is weakly acidic. It is widely used in glass (optical glass, acid-resistant glass, heat-resistant glass, glass fiber as insulating material) industry to improve the heat resistance and transparency of glass products, increase mechanical strength, and shorten melting time.

Boric acid and borax are illegal food additives , but there are still unscrupulous players who illegally use the two to increase the elasticity and toughness of food, extend the shelf life or keep the color beautiful, even in addition to alkaline dumplings, other foods, such as rice cakes, oil Noodles, dumplings, fish dishes, shrimps, often seeking "taste" are also often affected.

Although boric acid itself is not very toxic, it has a "cumulative effect" in the body. Although it is not taken every time, it will accumulate in the body after continuous intake. It may also damage the central and digestive system, hinder the function of digestive enzymes, cause loss of appetite, inhibit nutrient absorption, promote fat decomposition, and cause weight loss and other symptoms. In addition, in the study of boric acid ingestion in mice, mice and dogs, it has also been observed that long-term or short-term intake of large amounts of boric acid or borax can affect the male reproductive system, such as testicular atrophy. However, boric acid has not been observed to have a significant carcinogenic effect or cause genetic mutations, and no International Cancer Research Center (IARC) has classified it as a carcinogen.

In terms of dosage, adults taking 1 to 3 grams of boric acid will cause symptoms of "boric acid poisoning", including vomiting, diarrhea, skin erythema, and even risk of shock or coma; oral lethal dose is 15 to 20 grams for adults and 5-6 for babies Grams, 2-3 grams for babies.

If the laboratory is splashed by strong alkali, in addition to washing with a lot of water, it should also be coated with boric acid solution. Neutralize the residual strong base. This is the most basic and a recent usage. (If there is no boric acid solution around and it is splashed by strong alkalis, carbonic acid can be used in an emergency, but it is best to use boric acid, because boric acid is also an acid, which is weaker than the carbonic acid in cola.)

Boric acid is also one of the basic raw materials for the production of other borides. The boron compounds produced are widely used in national defense and other industrial departments and scientific research units. Used as a pH regulator, antibacterial preservative.

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