Sodium Metabisulfite

Sodium Metabisulfite is an inorganic compound commonly used as a reducing agent and preservative in industrial settings. It typically appears as a white to light yellow granular powder, making it easy to handle and measure for industrial processes. Its chemical formula is Na2S2O5, and it is supplied in granular or powder form with typical purity grades around 98%. Buyers should note that it can release sulfur dioxide gas when exposed to acids or moisture, which necessitates proper handling conditions. This chemical is commonly packaged in 25 kg bags, with bulk packaging options available upon request. Handling involves storage in cool, dry, and well-ventilated areas, away from oxidizing agents and moisture. Industrial handlers should consider a maximum recommended use concentration of about 0.1–0.5% for water treatment applications to balance efficacy and safety. Avoid mixing with acids to prevent hazardous gas release.

In water treatment, Sodium Metabisulfite serves as an effective dechlorinating agent that neutralizes residual chlorine and chloramine, which can otherwise damage downstream processes and harm aquatic life. Its reducing properties also prevent oxidation reactions that lead to corrosion in equipment and pipelines, thereby extending service life and minimizing maintenance costs. Additionally, in food processing, it acts as a preservative by inhibiting browning and microbial growth, ensuring longer shelf life and product safety. Managing dosage precisely is critical to avoid the off-flavors or chemical residues that can occur at excessive concentrations.