Sodium Bi Sulphite
SBS, Sodium Bisulfite, Sodium Hydrogen Sulfite.
- CAS
- 7631-90-5
- EC
- 231-548-0
- Sectors
- Water & Wastewater Treatment, Food & Nutrition, Textiles, Leather & Paper
Sodium Bi Sulphite (CAS 7631-90-5) is a white, powdered inorganic salt that acts as a reducing agent and antioxidant, releases sulfur dioxide in a stabilized form, and is used mainly for dechlorination in water treatment, food preservation and textile bleaching. It is a powerful reducing agent and antioxidant, primarily used to prevent oxidation and microbial growth in liquids.
In water treatment, it serves as an effective dechlorinating agent, rapidly neutralizing residual chlorine after disinfection cycles. The product is valued for its high solubility and efficiency in removing dissolved oxygen from boiler feed water to prevent corrosion.
In the food industry, it is utilized as a preservative to maintain the color and freshness of dried fruits and vegetables. Its stabilized formulation ensures a consistent release of sulfur dioxide, providing reliable protection against enzymatic browning.
Typical Properties
| Molecular formula | H2O3S.Na |
|---|---|
| Molecular weight | 104.06 g/mol |
| Form | Powder/Solid |
| Color | White |
| Odor | Slight odor of sulfur dioxide |
| Melting point | 150 °C |
| Density | 1.48 g/cm³ |
| Water solubility | 300 g/L |
| pH | 4.5 (20°C in H2O) |
| GHS signal word | Danger · Corrosive, Irritant / harmful, Health hazard |
| HS code | 28323010 |
| Grades available | Food Grade, Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sodium Bi Sulphite
Applications
- [Dechlorination]: Used in municipal wastewater plants to neutralize chlorine before the discharge of treated water into the environment.
- [Food Preservation]: Prevents oxidation and microbial spoilage in wines, fruit juices, and processed potato products.
- [Textile Processing]: Acts as a bleaching and antichlor agent in the treatment of wool and cellulose fibers.
Safety & Risks
Classified as Acute Tox. 4 and Eye Dam. 1; releases toxic sulfur dioxide gas when mixed with acids. Use Acid-Gas Respirators, Chemical Goggles, and Nitrile Gloves.
Packaging
Available in 25 kg PE-lined Bags, 1000 kg Big Bags, and 40% Aqueous Solution in IBC Tanks.