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Sodium Sulphite (Blue)
Sodium Sulphite Blue is a white to bluish-white crystalline powder with the chemical formula Na₂SO₃. The “Blue” grade indicates a specific industrial quality often containing minor additives or impurities, used primarily in water treatment and chemical industries. It acts as an effective oxygen scavenger, reducing agent, and preservative. This 25kg packaged product is highly soluble in water, forming alkaline solutions, and is widely used in pulp and paper, water treatment, textile, and photographic industries.
Sodium Sulphite (Blue)
Primary Uses
- Water Treatment
- Oxygen Scavenger: Removes dissolved oxygen from boiler feed water, preventing corrosion in steam and power plants.
- Wastewater Treatment: Neutralizes chlorine and chloramine residuals in drinking water and wastewater.
- Pulp & Paper Industry
- Dechlorination Agent: Removes residual chlorine from bleached pulp.
- Reducing Agent: Used in chemical pulping to protect fibers.
- Textile Industry
- Bleaching Agent: Used for bleaching cotton and wool fibers.
- Dyeing: Acts as an antioxidant in dyeing processes.
- Photographic Industry
- Preservative: Serves as a preservative in photographic developers.
- Chemical Industry
- Sulfur Dioxide Source: Releases SO₂ upon acidification, used in various chemical syntheses.
- Antioxidant: Prevents oxidation in chemical processes.
- Food Industry
- Preservative (E221): Used as a food additive to preserve dried fruits, wine, and other food products by preventing microbial growth and discoloration.
Secondary Uses
- Mining Industry
- Flotation Agent: Used in mineral flotation processes.
- Laboratory & Research
- Reducing Agent: Used in various analytical and synthetic applications.
1. Basic Identification Attributes
- Chemical Name (IUPAC): Sodium sulfite
- Common/Trade Name: Sodium sulphite (Blue grade)
- CAS Number: 7757-83-7
- HS Code: 2831.20.00
- Synonyms: Sodium sulfite, sodium sulphite, blue grade sodium sulphite
2. Physical & Chemical Properties
- Physical State: White to bluish-white crystalline powder
- Color & Odor: Bluish-white; odorless to slight sulfur odor
- Solubility: 22 g/100 mL water at 20°C
- Density: 2.633 g/cm³
- Melting Point: 33 °C (decahydrate) – blue grade typically near anhydrous form melting > 70 °C
- pH (1% solution): Alkaline (approx. 9-10)
- Appearance: Crystalline powder with blue tint
3. Safety & Hazard Attributes
- GHS Classification:
- Skin Irritant (Category 2)
- Eye Irritant (Category 2A)
- Toxicity: LD₅₀ (oral, rat) > 3000 mg/kg
- Exposure Limits: OSHA PEL: 5 mg/m³ (as dust)
- Corrosivity: Non-corrosive but irritating
4. Storage & Handling Attributes
- Storage Conditions: Store in a cool, dry, well-ventilated area, away from moisture and oxidizers
- Container Type: 25kg PE-lined paper bags or plastic drums
- Shelf Life: 12 months if stored properly
- Handling Precautions: Avoid dust inhalation; use protective equipment
5. Regulatory & Compliance Attributes
- REACH Registered
- FDA Approved for food use (E221)
- Complies with OSHA Hazard Communication Standard
- Not classified as hazardous for transport
6. Environmental & Health Impact
- Biodegradability: Inorganic salt; not biodegradable but environmentally safe in normal use
- Ecotoxicity: Low toxicity to aquatic life at typical concentrations
- Bioaccumulation: Not expected
- Aquatic Impact: Excess can lead to oxygen depletion in water bodies
Safety Handling Precautions
- PPE Required: Gloves, dust mask, safety goggles
- Handling Guidelines: Use local exhaust ventilation; avoid dust formation
- Storage Measures: Keep containers tightly closed and dry
First Aid Measures
- Inhalation: Move to fresh air; seek medical attention if symptoms develop
- Skin Contact: Wash with soap and water
- Eye Contact: Rinse thoroughly with water for 15 minutes; seek medical advice if irritation persists
- Ingestion: Rinse mouth; seek medical advice if large amounts ingested
Firefighting Measures
- Fire Hazards: Non-flammable; may emit sulfur oxides when heated
- Extinguishing Media: Use water spray, foam, dry chemical
- Hazardous Combustion Products: Sulfur oxides (SOx)
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