Sodium metabisulfite

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Sodium metabisulfite is a crystalline powder of white or slightly yellow color with a pungent odor of sulfur dioxide, highly soluble in water, sparingly soluble in ethyl alcohol. It is a salt of pyrosulfuric acid. When stored in air, the reagent loses SO2 and absorbs oxygen, turning into sodium sulfate. When salt is heated, thermal decomposition occurs with the release of sulfur dioxide SO2.

Sodium metabisulfite, as a substance with low toxicity, is widely used in the following areas:

Food industry.In this area, sodium metabisulfite is known as additive E223. Due to its structure, it exhibits the properties of an effective preservative and antioxidant. Its use in this area is possible due to the fact that it has no side effects. The safe dose per 1 kg of weight is 0.0007 g per day. When it enters the gastrointestinal tract, the substance is oxidized in the liver to the state of sulfites, concentrated in primary urine, and then excreted in secondary urine. During migration throughout the body, sodium metabisulfite derivatives attach to free radicals and remove them. In the production of canned fish, seafood and meat products, it acts as a preservative. Used in the formulation of diabetic products, bakery products, chips, starch, etc. Used in the formulation of seasonings that contain lemon juice.

Non-alcoholic and low-alcohol drinks.Stabilizer for the production of juices and carbonated drinks. Not present in products for children's consumption.

Brewing.Sodium metabisulfite is a stabilizer that prevents clouding of beer and increases shelf life.

Winemaking.Sulfur dioxide is added to the wine material in the most accessible form. Causes lightening of the workpiece without loss of color in the future, and does not affect the taste.

Coffee production.The surface of the ripe berries is processed, after which the pulp is easily separated from the internal grains.

Medicine.In tablets it acts as an excipient that determines the structure. It is included in some injection solutions, ensuring the constancy of chemical properties until the date of sale. In addition to medicines, sodium metabisulfite is used during filtration in special installations, as well as during sterilization.

Chemistry and biochemistry.Included in many analytical solutions and reagents.

Agriculture.This preservative has been used for many decades to preserve silage, grain and straw, since it is not harmful to the health of animals and is eliminated from their bodies over several days without a cumulative effect. Suppresses the growth of mold and other microorganisms in feed. It is also used in agronomy as a substance that helps stop the development and regrowth of growth from large perennial stumps of large trees.

Production of natural cosmetics.It is included in creams, deodorants, shampoos and other products to increase shelf life.

Textile industry and leatherworking.It is used as a substance for bleaching fabric fibers and a reagent for tanning leather.

Communal sphere.Sodium metabisulfite is a reagent for treating wastewater from certain industries before this wastewater enters the general sewerage system and treatment facilities..

Indicator name	Norm
Na2S2O5, %, not less	95
SO2, %, not less	65
Fe,%, no more	0.01
Substances insoluble in water,%, no more	0.05
Heavy metals (Pb), %, no more	0
As,%, no more	0
Chlorides (Cl)	0.2

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Sodium metabisulfite is packaged in 25 kg polyethylene bags. or in big bags of 1000 kg. Belongs to the 3rd hazard class. Sodium pyrosulfite is a low-flammability and explosion-proof substance.

Delivery is carried out by all types of transport, except air. The reagent is dispensed in plastic bags, which prevent moisture from getting inside. Lack of reaction with the environment is the main condition for maintaining all the characteristics of sodium metabisulfite. During unloading, packaging and working with powder, you must follow safety rules, since if it gets into the eyes, a chemical burn develops on the mucous membrane, and if swallowed in its pure form, it causes harm to the gastrointestinal tract. Therefore, all work must be carried out wearing safety glasses, a respirator and rubber gloves. When storing bags, pay attention to ensure that the packaging remains sealed. Throughout the entire storage period, the following conditions must be ensured: no elevated temperature, air humidity up to 70%, distance to heating devices and radiators - at least 1 m, and from lighting fixtures with a power of 100 V - at least 50 cm. The room may be unheated , but must be covered.