Further advice can be obtained by [email protected] or by calling +86-17303712627.

    Sodium Sulfite

    Mondstar provides product support for the antioxidant sodium sulfite to help preserve freshness and nutritional value in your foods.


    Chemical name: Sodium sulfite; E221

    CAS Number:7757-83-7

    EINECS Number:231-821-4

    Molecular formula: Na2SO3

    Molecular weight:126.04

    Product Standard: GB1886/EP/USP/FCC


    Polypropylene woven bag lined with polyethylene plastic bag or paper-plastic composite bag. 25 kg/bag or 1000kg/bag.

    Storage Condition:

    Keep well closed in its original packing in a cool and dry place.

    Shelf life: 2 years.

    Buying Guide:

    Sodium Sulfite

    Mondstar offers a diverse range of chemical products and is your preferred supplier of food additives and ingredients, providing high-quality sodium sulfite powder wholesale and export services. For more information, you can directly contact [email protected] or call +86-17303712627.

    Product Overview

    Sodium Sulfite, represented by the sodium sulfite formula Na2SO3, is a white to light yellow crystal or granular powder characterized by its distinctive pungent sulfur dioxide odor. It is notable for its hygroscopic nature, readily absorbing moisture from the air, which underscores its reactivity and utility in various applications. The sodium sulfite molar mass, 126.04 g/mol, contributes to its excellent solubility in water, where it swiftly dissolves to form a clear solution. A key aspect of its chemical profile is the sodium sulfite pH range of 3-5 when in an aqueous solution, indicating an acidic nature. This compound functions effectively as a reducing agent and antioxidant, integral to its broad utility in diverse sectors. Its sulfate chemistry allows it to react with acids, producing sodium salts and sulfur dioxide gas, a reaction that highlights its versatility and importance in industrial processes.


    Item standard Company standard
    sodium sulfite (Na2SO3), mass fraction /% ≥96.0 ≥97.0
    Fe, mass fraction /% ≤0.01 ≤0.001
    Free alkali(As content Na2CO3), mass fraction /% ≤0.60 ≤0.4
    Heavy metal content(Pb), mass fraction /% ≤0.001 ≤0.0005
    As content (As content), mass fraction /% ≤0.0002 ≤0.0002
    Clarity Passed Passed
    The main application of Sodium Sulfite
    • Sodium sulfite in food and beverage industry is used as a preservative and anti-browning agent in wine, dried fruit, condiments, and fruit juices to prevent discoloration and keep products fresh. It is also used to handle fermentation processes.
    • Sodium sulfite in skin care products functions as a preservative to extend shelf life by inhibiting bacterial growth that can spoil formulas.
    • Sodium sulfite uses in pharmaceuticals as an antioxidant and preservative to maintain stability and shelf life. It is also used as a sulfonating agent.
    • Sodium sulfite in water treatment is used to remove chlorine and other disinfectant residues from municipal drinking water supplies. It helps control corrosion in electrical distribution systems.
    • Sodium sulfite in textiles is used as a bleaching agent for wool and silk to remove natural color and increase whiteness.
    • Sodium sulfite in papermaking is used to bleach lignin and extract color from wood pulp, improving the brightness and whiteness of paper products.

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