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Sodium metabisulfite

Sodium metabisulfite (Na2S2O5) is an inorganic compound, which is white or yellow crystal with a strong pungent smell. It is soluble in water and the aqueous solution is acidic. When it comes in contact with strong acid, it releases sulfur dioxide and generates corresponding salts. If left in the air for a long time, it will be oxidized into sodium sulfate, so sodium metabisulfite cannot be stored for a long time.


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Used in the production of insurance powder, sulfamethazine, metamizole, caprolactam, etc.;
Used for the purification of chloroform, phenylpropyl sulfone and benzaldehyde;
Ingredients used as fixatives in the photographic industry;
Used in the fragrance industry to produce vanillin;
Used as a preservative in the brewing industry;
Dechlorinating agent for rubber coagulant and cotton cloth bleaching;
Organic intermediates; used in printing, dyeing and tanning;
Used as reducing agent;
Used as wastewater treatment in the electroplating industry, oil fields, and mineral processing agents in mines;
Used as preservatives, bleaching agents, and loosening agents in food processing;

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