Description

Ammonium Sulfite is an inorganic salt widely utilized as a versatile reducing agent and preservative. Its commercial importance stems from its ability to prevent oxidation and inhibit microbial growth in various industrial processes. This compound is essential for manufacturers in the photographic, textile, food, and water treatment industries seeking reliable and effective chemical solutions.

Application

• Photographic Industry: Acts as a key component in photographic developers and fixers, serving as a preservative to prevent oxidation of developing agents.
• Food & Beverage Preservation: Used as an antioxidant and antimicrobial agent to maintain color and shelf-life in products like fruit juices, wines, and dried fruits.
• Textile Processing: Employed as a reducing agent in dyeing and printing processes, particularly for vat dyes, and as an antichlor to remove excess chlorine after bleaching.
• Water Treatment: Functions as an oxygen scavenger in boiler water treatment to prevent corrosion by removing dissolved oxygen.
• Chemical Synthesis: Serves as a sulfonating and sulfiting agent in the production of various specialty chemicals and pharmaceuticals.
• Pulp & Paper Industry: Used in chemical pulping processes and as a bleaching agent for mechanical pulps.

Basic Information

Product Name	Ammonium Sulfite
CAS No.	10196-04-0
Molecular Formula	(NH4)2SO3 • H2O
Molecular Weight	134.15 g/mol (monohydrate)
Synonyms	Diammonium sulfite; Sulfurous acid, diammonium salt; Ammonium sulphite; EINECS 233-484-9; (NH4)2SO3; Diammonium sulfite monohydrate; Ammonium sulfite solution
EINECS	233-484-9

Quality Control

Our Ammonium Sulfite is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, heavy metals, and clarity of solution are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat and incompatible materials. Due to its hygroscopic and easily oxidized nature, minimize exposure to air and moisture. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	White to yellowish crystalline solid or solution
Identification (IR)	Conforms
Assay (as (NH4)2SO3•H2O)	≥ 95.0 %
pH (5% solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 10 ppm
Insoluble Matter	≤ 0.01 %
Chloride (Cl)	≤ 0.005 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.