Potassium meta bisulfite(Potassium disulfide)

Potassium metabisulfite is a white crystalline powder with a pungent sulfur odor, commonly used as a preservative, antioxidant, and sterilizing agent in food, beverages, and laboratory applications. It releases sulfur dioxide when dissolved in water, which gives it its antimicrobial and antioxidant properties.

🏭⚗️ Production
Potassium metabisulfite is industrially produced by saturating a potassium hydroxide or potassium carbonate solution with sulfur dioxide gas. The resulting solution is concentrated and crystallized to yield potassium metabisulfite in solid form.

🔬 Properties
Potassium metabisulfite has the chemical formula K₂S₂O₅ and a molar mass of approximately 222.33 g/mol. It appears as a white or slightly yellow crystalline powder with a sharp sulfur-like odor. It is soluble in water, forming acidic solutions that release sulfur dioxide (SO₂). It is stable in dry conditions but decomposes when exposed to heat, moisture, or acids.

🧪 Applications
Potassium metabisulfite is widely used as a preservative and antioxidant in the food and beverage industry, particularly in winemaking, brewing, and dried fruit packaging. In laboratories, it is used as a sterilizing agent for equipment and containers. It also serves as a reducing agent in some chemical reactions and is used in photographic processing and water treatment.

⚠️ Safety
Potassium metabisulfite can cause irritation to the eyes, skin, and respiratory tract, especially in sensitive individuals or those with asthma. Inhalation of dust or sulfur dioxide vapors may lead to coughing, shortness of breath, or allergic reactions. It should be handled in well-ventilated areas using protective equipment, and stored in a tightly sealed container away from moisture and strong acids.