Sodium metabisulfite, with a chemical formula Na2S2O5, is a white to slightly yellow crystalline powder. It is a sodium salt of sulfurous acid. The “97%” designation indicates the purity level, meaning that the substance is composed of at least 97% sodium metabisulfite with the remainder being impurities or other compounds.
This compound is widely used for its antioxidant and preservative properties. In food and beverage industries, sodium metabisulfite is commonly employed as a food additive to prevent browning and microbial growth, extend shelf life, and maintain the color and flavor of various products, such as dried fruits, wines, and seafood. It also serves as a disinfectant and sanitizer in food processing equipment and facilities.
Beyond its culinary applications, sodium metabisulfite finds use in various industrial processes, including water treatment as a reducing agent to remove chlorine and other oxidizing agents, as a bleaching agent in the textile industry, and in the production of pulp and paper to break down lignin.
However, it’s important to note that sodium metabisulfite can cause allergic reactions in sensitive individuals and can be hazardous if ingested or inhaled in large quantities. Therefore, proper handling and storage procedures should be followed, and it should be kept away from incompatible substances.
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