Ascorbic Acid Crystalline Powder


    AppearanceWhite or almost white crystalline powder


    Assay99 to 100.5%
    (of solution)
    IdentificationPositive reaction
    pHWith 2% water solution: 2.4 to 2.8
    With 5% water solution: 2.1 to 2.6
    Heavy metalsMax 10 ppm
    CadmiumMax 1 ppm
    Sulphated ash
    (Residue on ignition)
    Max 0.1 %
    Related SubstancesImpurity C: Max 0.15%
    Impurity D: Max 0.15%
    Any other unspecific impurities: Max 0.1%
    Total impurities: Max 0.2%
    ArsenicMax 3 ppm
    Loss on drying0.04 to 0.4%
    Melting pointAbout 190°C
    Residual solvents
    NMT 3000ppm
    LeadMax 2 ppm
    (of solution)
    Oxalic AcidMax 0.2 %
    Specific Optical Rotation20.5 to 21.5°
    ZincMax 25 ppm
    MercuryMax 0.1 ppm
    Iron (Fe)Max 2 ppm
    CopperMax 5 ppm

    Direct Food Ingredients will ensure that any material supplied this specification will confirm to the above physical and chemical properties. However, we have no control over the use of the material and can accept no responsibility for problems caused by the customer's failure to ensure the material supplied is suitable for the intended use.

    This specification has been last modified on Thu 21 March 2013 (1546)

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