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Sodium Thiosulphate

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Sodium Thiosulphate (Na₂S₂O₃) is a white, crystalline, odorless powder or granular solid highly soluble in water. This 25kg packaged chemical is widely used in photographic processing, water treatment, chemical synthesis, and medicine. Known for its reducing and complexing properties, it acts as an effective dechlorinating agent and fixer in photography by dissolving silver halides. It is stable under normal conditions and easily handled for industrial and laboratory applications.

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Category: Analytical Reagents Tags: Inorganic Thiosulfate Salt, Na₂S₂O₃, Sodium Thiosulphate, Water treatment, White crystalline powder

Description

Table of Contents

Sodium Thiosulphate

Primary Uses

Photographic Industry

Fixer Agent: Removes unreacted silver halides from photographic emulsions, stabilizing the image.

Water Treatment

Dechlorination: Neutralizes chlorine and chloramine in drinking and wastewater.
Heavy Metal Precipitation: Used to precipitate heavy metals and reduce toxicity.

Chemical Industry

Reducing Agent: Employed in chemical syntheses and redox reactions.
Complexing Agent: Forms complexes with heavy metals aiding in detoxification.

Medical Field

Antidote: Used to treat cyanide poisoning by converting cyanide to less toxic thiocyanate.
Topical Agent: Used in treatments for certain skin conditions.

Mining Industry

Gold Extraction: Utilized in cyanide leaching processes as a detoxifying agent.

Laboratory & Research

Analytical Reagent: Used in iodometry and other titrations for quantitative analysis.

Secondary Uses

Photography

Bleach Fix: Component in bleach-fix baths for color photographic processing.

Environmental Applications

Wastewater Treatment: Detoxifies effluents containing chlorine and heavy metals.

KEY PRODUCT FEATURES

1. Basic Identification Attributes

Chemical Name (IUPAC): Sodium thiosulfate
Common/Trade Name: Sodium thiosulphate, hypo (photographic)
CAS Number: 7772-98-7
HS Code: 2841.40.00
Synonyms: Sodium hyposulfite, sodium thiosulfate pentahydrate (hydrated form)

2. Physical & Chemical Properties

Physical State: White crystalline powder or granules
Color & Odor: White; odorless
Solubility: Highly soluble in water (~70 g/100 mL at 20°C)
Density: 1.667 g/cm³ (pentahydrate)
Melting Point: Decomposes before melting (above 48°C for pentahydrate)
pH (1% solution): Neutral to slightly alkaline (7-9)

3. Safety & Hazard Attributes

GHS Classification: Not classified as hazardous under normal use
Toxicity: Low toxicity; oral LD₅₀ > 3000 mg/kg (rat)
Exposure Limits: No specific OEL; general dust precautions advised
Corrosivity: Non-corrosive

4. Storage & Handling Attributes

Storage Conditions: Store in a cool, dry place away from acids and moisture
Container Type: 25kg PE-lined bags or plastic drums
Shelf Life: 24 months if stored properly
Handling Precautions: Avoid dust generation; use PPE as needed

5. Regulatory & Compliance Attributes

REACH Registered
FDA Approved for specific uses
Complies with OSHA Hazard Communication Standard
Not classified as dangerous goods for transport

6. Environmental & Health Impact

Biodegradability: Inorganic salt; not biodegradable but environmentally safe in typical use
Ecotoxicity: Low toxicity to aquatic organisms
Bioaccumulation: None expected
Aquatic Impact: Excessive discharge may impact water chemistry

SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

PPE Required: Gloves, dust mask, goggles recommended during handling
Handling Guidelines: Use local exhaust ventilation to minimize dust
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 skin with soap and water
Eye Contact: Rinse with plenty of water for 15 minutes; seek medical attention if irritation persists
Ingestion: Rinse mouth; seek medical advice if large amounts ingested