Description

Sulphurous Acid, Sodium Salt CAS NO 10579-83-6 is a key inorganic chemical compound widely used as a versatile reducing agent and preservative. Its ability to act as an oxygen scavenger and antimicrobial agent makes it critical for controlling oxidation and spoilage in various industrial processes. This product is essential for manufacturers in sectors such as water treatment, food processing, textiles, and pulp & paper production.

Application

• Water Treatment: Used as a dechlorinating agent and oxygen scavenger in boiler feed water and municipal water systems to prevent corrosion.
• Food & Beverage Industry: Employed as a preservative (E221) and antioxidant to maintain color and shelf-life in dried fruits, wines, and fruit juices.
• Pulp & Paper Manufacturing: Serves as a bleaching agent and antichlor to remove excess chlorine after the bleaching process.
• Textile Processing: Utilized as a reducing agent in dyeing and printing processes, particularly for sulfur and vat dyes.
• Chemical Synthesis: Acts as a reducing agent and sulfonating agent in the production of various organic chemicals and pharmaceuticals.
• Photography: Used in photographic developing solutions as a preservative to prevent oxidation of developing agents.
• Leather Tanning: Applied in the deliming process to neutralize lime and prepare hides for tanning.

Basic Information

Product Name	Sulphurous Acid, Sodium Salt
CAS No.	10579-83-6
Molecular Formula	Na2SO3
Molecular Weight	126.04 g/mol
Synonyms	Sodium Sulfite; Disodium Sulfite; Sulfurous Acid Disodium Salt; Sodium Sulphite; E221; Soda Sulfite; Anhydrous Sodium Sulfite; Disodium Trioxosulfate
EINECS	234-188-7

Quality Control

Our Sodium Sulfite is manufactured under strict quality management systems to ensure batch-to-batch consistency and reliability. We provide material that meets relevant specifications for industrial, technical, and food-grade (FCC) applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity levels is available for every shipment to support 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 exclude moisture and air. Store away from strong acids and oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (as Na2SO3)	≥ 96.0 %
pH (5% solution)	8.5 - 10.5
Heavy Metals (as Pb)	≤ 10 ppm
Iron (Fe)	≤ 10 ppm
Water Insoluble Matter	≤ 0.05 %
Sodium Carbonate (Na2CO3)	≤ 1.0 %

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