Sodium metabisulfite, also known as sodium metabisulfite and oxygen metabisulfite, is an inorganic compound with the chemical formula NASsOo₅ and a relative molecular weight of 190.10.Sodium metabisulfite is highly reducing and has a slightly pungent odor. The substance is a white crystalline powder or small crystals. Common forms include powdered and granular.It is easily soluble in water, and the aqueous solution is acidic after dissolution, slightly soluble in ethanol, and insoluble in ether.It is easy to oxidize when exposed to air, gradually decomposes into sodium sulfate and releases sulfur dioxide. After moisture, its stability decreases and it needs to be sealed and stored.It is used in industrial production to manufacture insurance powders and sulfonamides, as bleaching agents, reducing agents, preservatives, and antioxidants, and is also used in food processing, water treatment, printing and dyeing, leather and other processes.Its strong reducing properties can inhibit microbial growth and prevent food browning in the food field. It can be used for decolorization and dechlorination in wastewater treatment in the industrial field. At the same time, it can be used as a reducing agent and bleaching agent in chemical experiments. It is widely used.

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Application Description

1. Used as a food additive in the food industry, it can be used as a bleaching agent, preservative, antioxidant, and used in the processing of dried fruits, candied fruits, biscuits, fruit juices, wine and other products. It can inhibit microbial reproduction, prevent food oxidation and browning, and maintain food color and flavor.
2. It is used as a bleaching agent, dechlorination agent and reducing agent in the textile printing and dyeing industry. It is used in the bleaching treatment of cotton, linen, silk and other textiles. It can remove residual chlorine from the fabric and improve the feel and color of the fabric. At the same time, it is used for the decolorization treatment of printing and dyeing wastewater.
3. The chemical industry is used in the production of insurance powder, sodium bisulfite, sulfonamides, etc., can also be used as a reducing agent to prepare other chemical products, and is also used as a rubber coagulant and bleaching agent in the rubber industry.
4. In the field of water treatment, it is used as a treatment agent for drinking water and industrial wastewater. It can remove free chlorine and heavy metal ions from the water, reduce the COD and BOD content in the water, and at the same time, it is used for decolorization and deodorization of wastewater to improve water quality.
5. It is used in the pharmaceutical industry to produce drugs such as sulfadiazine and analgin, and is used as a reducing agent in drug synthesis. It can also be used as a medicinal preservative to extend the shelf life of drugs.
6. It is used in papermaking, tanning and other processes in the light industry, and is used as a bleaching agent for pulp in the paper industry to improve the whiteness of pulp; it is used as an ash remover and bleaching agent for leather in the tanning industry to improve the quality of leather.
7. It can also be used as a fresh-keeping agent for fruits and vegetables in food processing. It is used for soaking citrus, apples, potatoes and other fruits and vegetables to inhibit the decay and deterioration of fruits and vegetables and extend the shelf life. At the same time, it can be used as a dough improver in food processing.
8. It is used as a chemical reagent in the laboratory, as a reducing agent, bleaching agent and sulfur dioxide generator, for experimental operations such as chemical analysis and organic synthesis, and can also be used for the removal of small amounts of moisture and impurities.