Sodium Metabisulfite
- CAS Number: 7681-57-4
- Chemical Formula: Na2S2O5
- MOQ: 1000KG
- Shelf Life: 2 years
- Forms: Powder
- Synonyms: Disodium Metabisulfite, Sodium Pyrosulfite, Sodium Metabisulfite Anhydrous
Product Description
What Is Sodium Metabisulfite?
Sodium Metabisulfite (Na2S2O5) is a white crystalline powder compound with a distinct sulfur odor. It serves extensively as an antioxidant, preservative, and disinfectant across food processing, water treatment, and diverse industrial sectors. Its effectiveness in preventing oxidation and inhibiting microbial growth ensures its significance in maintaining high product quality.
Preparation:
Sodium Metabisulfite is commonly synthesized by combining sulfur dioxide (SO2) with either sodium carbonate (Na2CO3) or sodium hydroxide (NaOH). This reaction forms sodium bisulfite (NaHSO3), which is then heated to remove water, resulting in the crystalline form of Sodium Metabisulfite. This compound’s versatility and cost-effectiveness make it indispensable in both industrial and consumer-focused applications.
Related Parameters:
| Items | Standards |
| Assay | 99% |
| Sieve Analysis | 100% pass 80 mesh |
| Loss on Drying | 5% Max. |
| Sulphated Ash | 5% Max. |
| Extract Solvent | Ethanol & Water |
| Heavy Metal | 5ppm Max |
| As | 2ppm Max |
| Residual Solvents | 0.05% Max. |
| Total Plate Count | 1000/g Max |
| Yeast & Mold | 100/g Max |
| E.Coli | Negative |
| Salmonella | Negative |
| Conclusion | Qualified |
Recommended Dosage of Sodium Metabisulfite:
| Applications | Dosage |
| Water Treatment | 0.1%-2% |
| Food and Beverage Preservation | 0.1%-1% |
| Textile and Leather Industry | 1%-3% |
| Pharmaceuticals and Cosmetics | 0.1%-1% |
| Chemical Manufacturing | 1%-5% |
| Agriculture | 0.5%-3% |
Sodium Metabisulfite Has Wide Range of Uses:
Sodium Metabisulfite is widely used across multiple industries for various applications.
- In water treatment, it acts as a dechlorinator and oxygen scavenger. For textiles and leather, it is used in bleaching, dyeing, and tanning processes.
- In the pharmaceutical and cosmetics industries, it functions as both a preservative and a reducing agent.
- In chemical manufacturing, it functions as a reducing agent and helps produce sodium bisulfite.
Additionally, it finds use in agriculture as a fungicide, in photography for film processing, and in industrial cleaning and laboratory applications for its chemical properties.
User Asked Question:
Q: What is the standard purity of various grades of sodium metabisulfite?
A: Sodium Metabisulfite comes in different grades, each with varying purity levels:
- Food Grade: 97%-99% purity, used in food processing.
- Industrial Grade: 95%-98% purity, used in water treatment and chemical processes.
- Pharmaceutical Grade: 99% or higher, used in pharmaceutical applications.
- Analytical Grade: 99% or higher, for laboratory and research purposes.
