Sodium Metabisulfite - ACS Grade

Product Overview

Sodium Metabisulfite (Na₂S₂O₅), also known as Sodium Disulfite or Sodium Pyrosulfite, is a white crystalline powder acting as a potent reducing agent and antioxidant. This ACS Grade material meets the rigorous purity standards set by the American Chemical Society, ensuring a typical assay of 98–100.5%. Its high purity and low impurity profile make it the preferred choice for analytical reagents, laboratory research, and sensitive industrial processes where trace metal contamination must be minimized.

With a molecular weight of 190.11 g/mol, Sodium Metabisulfite ACS Grade offers predictable reaction kinetics for redox modulation and dechlorination. It is highly soluble in water, releasing sulfur dioxide in acidic solutions to drive chemical reduction. This product features strict limits on impurities such as Iron (Fe ≤ 0.005%) and Heavy Metals (Pb ≤ 0.001%), supporting precise formulation in photography, textile processing, and chemical synthesis.

Key Specifications

• Chemical Formula: Na₂S₂O₅
• Grade: ACS Reagent Grade
• Assay: ≥ 98.0% (Typical 98-100.5%)
• Appearance: White crystalline powder
• Solubility: Freely soluble in water
• Residue After Ignition: ≤ 0.05%
• Chloride (Cl): ≤ 0.005%
• Iron (Fe): ≤ 0.005%
• Heavy Metals (as Pb): ≤ 0.001%

Common Applications

• Analytical Chemistry: Used as a primary reagent in laboratory titrations and reduction processes requiring high purity.
• Water Treatment: Effective dechlorination agent for removing residual chlorine and oxygen scavenging in boiler systems.
• Photography: Essential component in developing solutions, acting as a preservative to prevent oxidation of the developing agent.
• Textile & Leather Processing: Used in bleaching operations and as an antichlor to remove excess chlorine from fibers.
• Chemical Synthesis: Acts as a source of sulfur dioxide and a reducing agent in the production of surfactants and acrylics.

Safety & Handling

Classification: UN 3260, Corrosive solid, n.o.s., Class 8, Packing Group III.

This product is corrosive and can cause serious eye damage and skin irritation. It liberates toxic sulfur dioxide gas when in contact with acids. Store in a cool, dry, well-ventilated area in corrosion-resistant containers (HDPE). Keep containers tightly closed to prevent oxidation and moisture absorption. Operators should wear full protective gear, including chemical goggles, gloves, and respiratory protection if dust is present. Refer to the SDS for full safety and emergency protocols.

Related Products

• Sodium Metabisulfite - Food Grade
• Sodium Metabisulfite - Technical Grade