Sodium Metabisulfite (chemical formula: Na₂S₂O₅) is a common inorganic compound with strong reducing properties and is widely used in various industries. Its main applications are as follows:
1. Food Industry
Preservative and Antioxidant: Inhibits the growth of bacteria and mold, extending the shelf life of food products.
Bleaching Agent: Used to bleach sugar, desiccated coconut, raisins, etc.
Fermentation Control: In winemaking and juice production, it is used to kill wild yeasts and bacteria to prevent premature fermentation.
2. Chemical Industry
Reducing Agent: Used to remove oxides (e.g., boiler scale) and residual bleaching agents in industrial processes.
Dechlorination Agent: Removes free chlorine in drinking water and wastewater.
Dye Industry: Used in reduction dyeing and decolorization processes.
3. Photography Industry
Acts as an antioxidant in developer solutions, extending their service life.
4. Pharmaceutical Industry
Used as an intermediate in drug synthesis and for stabilizing certain pharmaceuticals.
5. Water Treatment
Removes residual chlorine and heavy metal ions in water to protect equipment and aquatic life.
Precautions
When exposed to water, sodium metabisulfite releases sulfur dioxide gas, which can irritate the respiratory system. Proper ventilation and protective measures are required during use.
Its use as a food additive is strictly regulated, and excessive use is prohibited.
Post time: Jun-27-2025
