Sodium sulfite
Sodium sulfite (CAS: 7757-83-7; Na2SO3; MW: 126.04) is an inorganic salt with a wide range of industrial and laboratory applications. Known for its reducing properties, it serves as a deoxygenating agent and a source of sulfur dioxide. This chemical is widely employed in water treatment, pulp and paper manufacturing, and as a photographic chemical. Tech Serve Solutions offers Sodium Sulfite in JIS special grade, ensuring high quality for your chemical needs.
Water Treatment
Sodium sulfite acts as an effective oxygen scavenger in boiler feedwater and other industrial water systems. By reacting with dissolved oxygen, it prevents corrosion and extends the lifespan of equipment.
Pulp and Paper Industry
It is used in the pulping process to delignify wood. Sodium sulfite helps break down lignin, separating cellulose fibres for paper production.
Chemical Synthesis
As a reducing agent, sodium sulfite is utilised in various organic synthesis reactions. It can also serve as a precursor for other sulfur-containing compounds.
Photography
In photographic processing, sodium sulfite acts as a preservative for developing solutions and as a component in stop baths, preventing oxidation.
Disulfide Bond Cleavage
This compound can be used in biochemical applications to cleave disulfide bridges in proteins, aiding in protein structure analysis and manipulation.
| Molecular weight | 126.04 |
|---|---|
| Linear formula | Na2SO3 |
| Assay | 95.0-100.0% (iodometric) |
| Grade | JIS special grade |
| Solubility | H2O: soluble1 M at 20 °C, clear, colorless |
| pH | 9.0-10.5 (25 °C, 1 M in H2O) |
| Loss on drying | ≤0.1% loss on drying, 20 °C (HV) |
| Impurities tested | residual solvents, complies≤0.001% heavy metals (as Pb)≤0.05% thiosulfate (S2O3) |
| Suitability | complies for appearance of solution |
| Protective equipment | Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Risk statements (R) | 31 |
| Supplemental hazards | Contact with acids liberates toxic gas. |
| Cation traces | Fe: ≤10 mg/kgSe: ≤10 mg/kgZn: ≤10 mg/kg |
| Anion traces | chloride (Cl-): ≤200 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Availability | available only in Japan |
|---|---|
| Absorption | absorption1M/265 nm, H2O cut-off |
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Sodium Sulfite used for?
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Sodium sulfite (CAS: 7757-83-7) is used in water treatment as an oxygen scavenger, in the pulp and paper industry for pulping, in chemical synthesis as a reducing agent, in photography, and for cleaving disulfide bonds in biochemistry.
What are the CAS number and formula for Sodium Sulfite?
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The CAS number for Sodium Sulfite is 7757-83-7, and its chemical formula is Na2SO3.
What grade and purity does Tech Serve Solutions supply for Sodium Sulfite?
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Tech Serve Solutions supplies Sodium Sulfite in JIS special grade with an assay of 95.0-100.0% (iodometric). TSS does not represent this product as USP, BP, or EP grade unless explicitly stated in the product data.
What are the safety considerations when handling Sodium Sulfite?
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Contact with acids liberates toxic gas. It is recommended to wear gloves when handling Sodium Sulfite. Always consult the Safety Data Sheet (SDS) for comprehensive safety information.
How is Sodium Sulfite packed, shipped, and exported by TSS?
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Sodium Sulfite is available only in Japan. Please contact TSS for specific packaging and shipping details relevant to your location and order.
How can I request a sample or quote for Sodium Sulfite?
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To request a sample or a quote for Sodium Sulfite, please contact the Tech Serve Solutions sales team through our website or by phone.
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