Sodium Sulphite (Blue)

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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.

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Categories: Antioxidants, Preservatives(food) Tags: Blue Grade Sodium Sulphite, Inorganic Sulfite Salt, Na₂SO₃, Sodium Sulphite, Water treatment, White to Blue-Tinted Powder

Description

Table of Contents

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.

KEY PRODUCT FEATURES

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

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