Description

Ammonium Sulfite Monohydrate is an inorganic salt widely used as a versatile reducing agent and preservative. Its primary commercial value lies in its ability to prevent oxidation and inhibit microbial growth, making it essential for protecting product integrity and shelf life. This compound is particularly important for manufacturers in the photographic, food processing, textile, and water treatment industries.

Application

• Photographic Industry: As a key component in photographic developers and fixers to prevent oxidation of developing agents.
• Food & Beverage Additive: Used as a preservative (E number) to inhibit browning and spoilage in products like wine, fruit juices, and dried fruits.
• Textile Processing: Acts as a reducing agent and bleaching assistant in dyeing and printing processes.
• Water Treatment: Employed as an oxygen scavenger in boiler feed water and industrial water systems to prevent corrosion.
• Chemical Synthesis: Serves as a sulfonating and reducing agent in various organic synthesis reactions.
• Pulp & Paper Industry: Used in bleaching sequences and as a chlorine dioxide scavenger.
• Pharmaceutical Intermediate: Utilized in the synthesis of certain active pharmaceutical ingredients (APIs).
• Analytical Chemistry: Applied as a reagent in analytical procedures and laboratory testing.

Basic Information

Product Name	Ammonium Sulfite Monohydrate
CAS No.	7783-11-1
Molecular Formula	(NH4)2SO3 • H2O
Molecular Weight	134.15 g/mol
Synonyms	Diammonium sulfite monohydrate; Ammonium sulphite monohydrate; Sulfurous acid, diammonium salt, monohydrate; EINECS 231-984-1; (NH4)2SO3.H2O; Ammonium sulfite hydrate
EINECS	231-984-1

Quality Control

Our Ammonium Sulfite Monohydrate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and performance. Certificates of Analysis (COA) documenting these results are available for review and are provided with every shipment to ensure full traceability and compliance with your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; containers must be kept tightly sealed to minimize exposure to air and moisture. Store away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to yellowish crystalline powder
Identification (IR)	Conforms
Assay (as (NH4)2SO3•H2O)	≥ 95.0 %
pH (5% solution)	6.0 - 8.0
Water Insoluble Matter	≤ 0.05 %
Heavy Metals (as Pb)	≤ 10 ppm

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