Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3)

Product Overview

Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3) is a concentrated liquid reducing agent and antioxidant utilized in industrial water treatment, textile manufacturing, and chemical synthesis. Also known as Sodium Hydrogen Sulfite, this 25% w/w aqueous solution is formulated to provide consistent reducing capacity for redox reactions, dechlorination, and oxygen scavenging. The Technical Grade designation indicates a composition suitable for industrial processing, waste treatment, and non-critical laboratory applications.

The solution is manufactured under strict quality control to minimize heavy metal impurities (Fe, Pb, Cu) and ensure a typical assay range of 24–26%. It is widely employed to neutralize residual chlorine in municipal and industrial effluents, preventing oxidative damage to downstream equipment like reverse osmosis membranes. To maintain efficacy, the product is packaged to minimize headspace and prevent premature oxidation. Users must verify compatibility with specific process requirements through the provided specification data.

Key Properties

• Chemical Name: Sodium Bisulfite
• Synonyms: Sodium Hydrogen Sulfite, Sodium Acid Sulfite
• Formula: NaHSO₃
• Concentration (Assay): 25% w/w (Typical)
• Grade: Technical
• Specific Gravity: 1.10 – 1.15 at 20°C (Typical 1.13)
• Appearance: Clear, colorless to pale yellow liquid
• pH: 4.5 – 5.5 at 25°C
• Iron (Fe): Max 5 ppm
• Heavy Metals (as Pb): Max 2 ppm
• Chloride (Cl): Max 25 ppm

Common Applications

• Water Treatment: Serves as a dechlorination agent to remove residual chlorine and chloramines from wastewater and potable water systems.
• Reverse Osmosis Protection: Removes free chlorine prior to RO membranes to prevent oxidation and extend membrane life.
• Textile Industry: Used as an "antichlor" in bleaching processes and as a reducing agent in dye manufacturing.
• Chemical Synthesis: Acts as a reducing agent in the production of chemical intermediates and purification processes.
• Oxygen Scavenging: utilized in boiler water treatment and drilling fluids to minimize corrosion caused by dissolved oxygen.

Safety & Handling

Sodium Bisulfite 25% is a corrosive liquid and a strong reducing agent. It reacts with acids to release toxic sulfur dioxide gas. Storage areas must be well-ventilated and cool, keeping containers tightly sealed to prevent oxidation and release of fumes. Personnel must wear appropriate Personal Protective Equipment (PPE), including chemical-resistant gloves, splash goggles, and protective clothing.

Shipping Information: UN 1760, Corrosive liquid, n.o.s. (Sodium Bisulfite), Class 8, Packing Group II. Consult the Safety Data Sheet (SDS) for full safety, spill, and first aid instructions before use.

Benefits

• High Efficiency: 25% concentration offers a potent reducing capacity for demanding industrial applications.
• Dechlorination Power: Rapidly neutralizes chlorine residuals in water treatment workflows.
• Specification Controlled: Rigorous testing for heavy metals and impurities ensures process consistency.
• Versatile Packaging: Available in sizes ranging from 1 Quart bottles to 330 Gallon totes to suit scale.

Related Products

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• Aluminum Sulfate Hydrate ACS Grade
• Calcium Chloride