Introduction
Sodium metabisulfite (CAS 7681-57-4) is a common inorganic sulfur-containing reducing agent widely used in food, beverages, printing and dyeing, pharmaceuticals, and industrial water treatment. This guide is intended for purchasing, quality control, and technical personnel, providing practical product information, application scenarios, and usage precautions to help you quickly understand the key aspects of this product. As an experienced supplier of chemicals and food additives, Sinoright can provide customers with stable products and technical support.
Basic Characteristics
| Chemical Name | Sodium metabisulfite |
| Molecular Formula | Na2S2O5 |
| Appearance | White or slightly yellowish crystals or powder |
| Solubility | Easily soluble in water, the solution is acidic or neutral and has reducing properties |
| Storage | Store in a cool, dry place, protected from moisture and sealed, avoiding high temperatures and contact with strong acids |
Main Functions and Applications
This product has strong reducing and antioxidant properties, and its common uses include:
Antioxidant: Used in food processing to prevent color oxidation and extend shelf life.
Bleaching agent/Bleaching aid: Used in the textile, paper, and starch industries.
Preservative/Antibacterial agent: At certain concentrations, it can inhibit microbial growth and is often used for short-term preservation of food and beverages.
Reducing agent in chemical synthesis: Used as a reducing agent or reaction medium in pharmaceutical and chemical synthesis.
Wastewater treatment: Used to reduce residual chlorine in wastewater or as a neutralizing agent for disinfectants.
Common Types and Specifications
Common product specifications on the market include industrial grade, food grade, and pharmaceutical grade, with different purity and impurity control standards:
Industrial grade: Lower purity, suitable for industrial uses such as water treatment and bleaching.
Food grade: Meets food safety standards, suitable for food processing and preservation.
Pharmaceutical grade/Analytical grade: High purity, suitable for pharmaceutical production or laboratory analysis.
Sinoright can provide various particle sizes and packaging options according to customer needs.
Usage and Operating Points
Solution preparation: According to the specified ratio, slowly add sodium metabisulfite to water while stirring to dissolve, avoiding adding a large amount at once, which can cause localized high concentrations.
Dosage control: Strictly add according to industry standards or formula dosages. When used in food, relevant regulations and limits should be followed. Protective Measures: Wear protective gloves and safety glasses during preparation and handling. Ensure good ventilation in the operating environment.
Waste Liquid Treatment: When handling waste liquid containing this product, neutralize and treat it according to local discharge regulations to avoid direct discharge.
Precautions and Risk Management
Contact with strong acids will release sulfur dioxide (SO₂). In this case, immediately evacuate and increase ventilation.
Moisture or high temperatures may lead to quality degradation or clumping. Storage in dry, sealed packaging is recommended.
For individuals or processes sensitive to sulfites, assess residual levels and sensory impact, and conduct testing if necessary.
Tip: When purchasing, be sure to verify the production batch number and expiration date, check the Certificate of Analysis (COA), and perform necessary physical and chemical tests. On-site sampling can reduce quality risks. Reject damaged packaging or incomplete labels, and retain samples for traceability and comparison. Email or call for more technical support.
Purchasing and Quality Recommendations
When purchasing, it is recommended to request the product specification sheet, COA (Certificate of Analysis), and Safety Data Sheet (SDS) from the supplier. Choosing a supplier with stable production and quality traceability capabilities, such as Sinoright, can reduce procurement risks and provide technical support.
Frequently Asked Questions (FAQ)
Q: Can this product be directly used for drinking water treatment?
A: Direct addition to drinking water is not recommended. For food applications, it must comply with regulatory limits and pass compliance testing.
Q: How to determine if the product is damp or deteriorated?
A: If clumping, significant color change, or a pungent odor occurs, it indicates that the product may be damp or partially decomposed. Physical and chemical testing should be performed to determine whether it can still be used.
Conclusion
This article summarizes the basic information, main uses, common types, and usage and safety precautions of sodium metabisulfite. For companies requiring stable supply and technical support, it is recommended to cooperate with experienced suppliers to ensure compliance and quality. For samples or technical discussions, please contact Sinoright for more information.