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Sodium Hydrogen Sulphite Extra Pure
Original price was: $ 18.66.$ 18.54Current price is: $ 18.54.
Sodium Hydrogen Sulphite Extra Pure is a white to pale yellow crystalline powder with a pungent sulfur dioxide odor. It is a versatile reducing agent widely used in laboratory, industrial, and food applications for its antioxidant, preservative, and dechlorinating properties. In laboratories, it serves as a reagent for redox reactions and oxygen scavenging. It is also used in water treatment for chlorine removal and in food processing as an antimicrobial and antioxidant agent (E221). Due to its ability to release sulfur dioxide gas, careful handling and storage in sealed containers are essential to maintain quality and ensure safety. The Extra Pure grade ensures high purity suitable for analytical, pharmaceutical, and food industry applications.
Sodium Hydrogen Sulphite Extra Pure
PRIMARY USES
- Analytical Reagent & Laboratory Applications:
Used as a reducing agent in chemical synthesis and analytical chemistry
• Employed in redox titrations and oxygen scavenging in laboratory processes
• Acts as a preservative to prevent oxidation in various chemical preparations - Water Treatment:
Applied for dechlorination and removal of excess chlorine in water treatment plants
• Used to reduce oxygen content and prevent corrosion in boiler feedwater systems - Food Industry:
Serves as a food preservative and antioxidant to prevent spoilage and discoloration (E221)
• Used in wine, beer, and fruit juice production to inhibit microbial growth and oxidation - Pharmaceutical & Cosmetic Industry:
Utilized as a reducing agent in the manufacture of certain pharmaceuticals and cosmetics
• Helps maintain product stability by preventing oxidation - Textile & Dyeing Industry:
Used as a reducing agent in dye bleaching and color correction processes
• Helps fix dyes and improve fabric brightness
SECONDARY USES
- Pulp and Paper Industry:
Used in pulp bleaching processes as a reducing agent - Photography:
Acts as a chemical in photographic developing solutions to reduce silver halides
1. Basic Identification Attributes
- Chemical Name: Sodium Hydrogen Sulphite
• CAS Number: 7631-90-5
• HS Code: 2831.20.00
• Molecular Formula: NaHSO₃
• Synonyms:
- Sodium bisulfite
- Sodium bisulphite
- Disodium hydrogen sulfite
2. Physical & Chemical Properties
Physical State: Solid (crystalline powder)
• Color & Odor: White to pale yellow, pungent sulfur dioxide odor
• Melting Point: Decomposes before melting (approx. 150 °C)
• Density: About 1.48 g/cm³
• Solubility:
- Highly soluble in water
- Insoluble in ethanol
• pH Level: Acidic to neutral aqueous solution (pH ~4-5)
• Vapor Pressure: Not significant
• Flash Point: Not flammable
3. Safety & Hazard Attributes
Hazard Class (GHS Classification):
- Skin irritation (Category 2)
- Eye irritation (Category 2A)
- Respiratory sensitizer in some cases
• NFPA Ratings: - Health: 2
- Flammability: 0
- Reactivity: 1
• Exposure Limits: - No specific OSHA PEL; avoid inhalation of dust and fumes
• Reactivity: - Decomposes releasing sulfur dioxide gas on heating
- Reacts with acids releasing toxic gases
4. Storage & Handling Attributes
Storage Conditions:
- Store in a cool, dry, well-ventilated area away from acids and oxidizers
- Keep containers tightly closed
• Incompatible Materials: - Strong acids
- Oxidizing agents
• Container Type: - Plastic or sealed metal drums
• Shelf Life: - Stable if kept dry and sealed
• Special Handling Requirements: - Use protective gloves, goggles, and dust mask
- Avoid dust generation and inhalation
5. Regulatory & Compliance Attributes
Regulatory Status:
- Approved for limited food use as preservative (E221)
- Listed under REACH and EPA inventories
• Transportation Restrictions: - Not classified as hazardous for transport under normal conditions
• Waste Disposal Method: - Dispose according to local environmental regulations; avoid release to environment
6. Environmental & Health Impact
Ecotoxicity:
- Moderate toxicity to aquatic life; avoid discharge into waterways
• Persistence in Environment: - Breaks down relatively quickly under aerobic conditions
• Carcinogenicity/Mutagenicity: - Not classified as carcinogenic or mutagenic
• Biodegradability: - Biodegradable with moderate persistence
SAFETY PRECAUTIONS
Personal Protective Equipment (PPE):
• Wear chemical-resistant gloves
• Use safety goggles or face shield
• Use dust mask or respirator if dust is present
• Wear protective clothing
Handling:
• Handle in a well-ventilated area
• Avoid inhalation of dust and fumes
• Prevent contact with skin and eyes
• Wash hands after handling
Storage:
• Store in tightly sealed containers in a cool, dry place
• Keep away from acids, oxidizers, and moisture
FIRST AID MEASURES
Inhalation:
• Move to fresh air immediately
• Seek medical attention if breathing difficulties occur
Skin Contact:
• Wash skin thoroughly with soap and water
• Remove contaminated clothing
• Seek medical advice if irritation develops
Eye Contact:
• Rinse eyes immediately with plenty of water for at least 15 minutes
• Seek medical attention promptly
Ingestion:
• Rinse mouth with water
• Do not induce vomiting unless directed by medical personnel
• Seek medical attention if symptoms occur
FIRE FIGHTING MEASURES
Flammability:
• Non-flammable
Extinguishing Media:
• Use water spray, foam, dry chemical, or CO₂
Hazardous Combustion Products:
• Releases sulfur dioxide and other toxic gases on decomposition
Firefighter Protection:
• Wear self-contained breathing apparatus and full protective gear
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