Description

Ammonium Bisulfite is an inorganic salt widely recognized for its potent reducing and oxygen-scavenging properties. This makes it a critical chemical for controlling oxidation processes and preventing unwanted degradation in industrial systems. It is essential for manufacturers and processors in sectors such as water treatment, pulp & paper, and chemical synthesis who require reliable and effective reducing agents.

Application

• Water Treatment: Primary application as an oxygen scavenger and reducing agent in boiler feed water and industrial wastewater treatment to prevent corrosion and control dissolved oxygen levels.
• Pulp & Paper Industry: Used in chemical pulping processes and as a bleaching agent or bleach neutralizer to improve pulp brightness and strength.
• Chemical Synthesis: Serves as a reducing agent and sulfonating agent in various organic synthesis reactions and pharmaceutical intermediate manufacturing.
• Photography: Employed in photographic developing solutions as a fixing agent or preservative.
• Textile Processing: Acts as a reducing agent in dyeing and printing processes, particularly for vat dyes.
• Food Industry (Technical Grade): Used as a preservative and antioxidant in certain food processing applications, though specific food-grade compliance must be verified.
• Gas Scrubbing: Utilized in flue gas desulfurization (FGD) and other air pollution control systems to remove sulfur oxides.
• Metal & Mining: Applied in ore flotation and as a reducing agent in metal refining and plating baths.

Basic Information

Product Name	Ammonium Bisulfite
CAS No.	10192-30-0
Molecular Formula	NH4HSO3
Molecular Weight	99.11 g/mol
Synonyms	Ammonium Hydrogen Sulfite; Monoammonium Sulfite; Sulfurous Acid, Monoammonium Salt; Ammonium Sulfite (1:1); ABS; Ammonium Metabisulfite (common misnomer, related compound); Ammonium Pyrosulfite (common misnomer, related compound)
EINECS	233-469-7

Quality Control

Our Ammonium Bisulfite is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for assay, purity, and impurity profiles. Certificates of Analysis (COA) are provided with every shipment, and we can support compliance with relevant industrial standards. For specific grade requirements such as technical or food-grade specifications, please contact our technical team.

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 (moisture-sensitive) and easily oxidized nature, it is recommended to store under an inert atmosphere for long-term stability and to minimize contact with air. Ideal storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	White to yellowish crystalline solid or solution
Identification (IR)	Conforms
Assay (as NH4HSO3)	Min. 95.0%
pH (1% Solution)	4.0 - 5.5
Heavy Metals (as Pb)	Max. 10 ppm
Iron (Fe)	Max. 5 ppm
Chloride (Cl)	Max. 50 ppm
Sulfate (SO4)	Max. 0.1%

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