- ▸ Photographic processing: reducing agent in photographic chemistry
- ▸ Caramel color: process input in caramel production
- ▸ Refractory manufacture: additive in refractory-brick production
- ▸ Chemical intermediate: feedstock for ammonium thiosulfate and ammonium chloride
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Ammonium sulfite (ammonium sulfite monohydrate, (NH4)2SO3·H2O; CAS 7783-11-1) is a water-soluble reducing agent and oxygen scavenger. As a source of sulfite, it removes dissolved oxygen and reduces other species, which makes it useful in boiler and process-water treatment, photography, pulp and paper, leather and as a chemical intermediate. Identity: PubChem.
What is ammonium sulfite?
Ammonium sulfite is the ammonium salt of sulfurous acid, supplied as the monohydrate. In water it provides the sulfite ion, a reducing agent that scavenges dissolved oxygen and reduces oxidized species; it also supplies ammonia/nitrogen chemistry. It must be kept from acids, which liberate sulfur dioxide.
Applications by sector
Water treatment. An oxygen scavenger and reducing agent for boiler and process water, protecting metal from oxygen corrosion. Pulp & paper. A sulfite source in pulping and bleaching chemistry. Photography & imaging. A reducing agent/preservative in processing solutions. Leather & industrial. A reducing and processing agent and a chemical intermediate. Dose to the oxygen load or reaction; verify by residual testing.
Forms and grades
Supplied as the crystalline monohydrate or as a solution at a stated concentration; confirm form and grade on the RFQ. The CoA documents the lot.
Handling and documentation
Keep ammonium sulfite away from acids, which release toxic sulfur dioxide; store cool and handle per the current Safety Data Sheet (SDS). Each lot ships with a Certificate of Analysis (CoA).
Bulk supply and RFQ
RawSource supplies ammonium sulfite in bulk to water-treatment, pulp/paper and industrial buyers, with CoA and SDS per lot. Submit an RFQ with your form, concentration and target quantity.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical Name | Ammonium sulfite monohydrate |
| CAS Number | 7783-11-1 |
| Molecular Formula | (NH4)2SO3·H2O |
| Appearance | White crystals or aqueous solution |
| Solubility | Soluble in water |
| Function | Reducing agent; oxygen scavenger; sulfite source |
| Incompatibilities / handling | Keep from acids (releases SO2); refer to the current SDS |
Frequently Asked Questions
What is ammonium sulfite used for?
Ammonium sulfite (CAS 7783-11-1) is a reducing agent and oxygen scavenger used in boiler and process-water treatment, pulp and paper, photographic processing, leather and as a chemical intermediate.
How does ammonium sulfite scavenge oxygen?
Its sulfite ion reacts with dissolved oxygen (oxidizing to sulfate), removing the oxygen that drives corrosion in boiler and process water.
Is ammonium sulfite hazardous?
It must be kept away from acids, which release toxic sulfur dioxide gas. Store cool and handle with appropriate PPE and ventilation per the SDS.
What is the CAS and formula of ammonium sulfite?
It is ammonium sulfite monohydrate, CAS 7783-11-1 (PubChem CID 21701053), formula (NH4)2SO3·H2O. The CoA documents form and grade.
How is bulk ammonium sulfite supplied and quoted?
RawSource supplies it as crystals or solution in bulk with CoA and SDS per lot. Pricing is quote-based on form, concentration and volume; submit an RFQ with your target quantity.
Disclaimer. Information on this page — including chemical properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot you purchase governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim, or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.