Sodium Sulfite Anhydrous CAS 7757-83-7: Comprehensive User Guide
Table of Contents
1. Product Overview & Specifications
Sodium Sulfite Anhydrous (CAS 7757-83-7) is a white crystalline powder with a molecular formula of Na2SO3. Widely used as an antioxidant, preservative, and reducing agent across industries.
Technical Parameters Comparison
| Parameter | Sodium Sulfite Anhydrous | Alternative Products |
|---|---|---|
| Purity | ≥98% | 90-95% (typical competitors) |
| Solubility (20°C) | 27 g/100ml H2O | 15-20 g/100ml |
| pH (1% solution) | 9.0-10.5 | 8.5-10.0 |
2. Key Applications & Industrial Uses
Water Treatment
Removes dissolved oxygen in boiler systems at 10-100 ppm concentrations.
Food Preservation
FDA-approved for dried fruits at ≤500 ppm to prevent browning.
Photography
Used in developing solutions at 2-5% concentration to prevent oxidation.
3. Step-by-Step Usage Guidelines
For Wastewater Treatment
- Test initial oxygen levels (target: <0.1 mg/L)
- Add 50-200 mg/L depending on contamination
- Maintain pH 8.5-9.5 for optimal performance
4. Real-World Case Studies
Textile Factory in Gujarat
Reduced dye oxidation by 72% using 75 ppm in rinsing cycles.
5. Customer Success Stories
Shanghai Pharmaceutical Co.
Achieved 24-month API stability using 0.1% w/w in injectables.
California Winery
Extended shelf life of organic wines by 8 months with 200 ppm dosage.
6. Request a Quote or Sample
Contact our chemical specialists for technical support:
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