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    Commission Regulation (EU) No 231/2012 of 9 March 2012 laying down specifications... (32012R0231)
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    E 450 (iii) TETRASODIUM DIPHOSPHATE

    Synonyms

    Tetrasodium pyrophosphate; Tetrasodium disphosphate; Tetrasodium phosphate

    Definition

    Einecs

    231-767-1

    Chemical name

    Tetrasodium diphosphate

    Chemical formula

    Anhydrous: Na4P2O7

    Decahydrate: Na4P2O7 · 10H2O

    Molecular weight

    Anhydrous: 265,94

    Decahydrate: 446,09

    Assay

    Content not less than 95 % of Na4P2O7 on the ignited basis

    P2O5 content not less than 52,5 % and not more than 54,0 %

    Description

    Colourless or white crystals, or a white crystalline or granular powder. The decahydrate effloresces slightly in dry air

    Identification

    Test for sodium

    Passes test

    Test for phosphate

    Passes test

    Solubility

    Soluble in water. Insoluble in ethanol

    pH

    Between 9,8 and 10,8 (1 % solution)

    Purity

    Loss on ignition

    Not more than 0,5 % for the anhydrous salt, not less than 38 % and not more than 42 % for the decahydrate (105 °C, 4 hours then 550 °C, 30 minutes)

    Water insoluble matter

    Not more than 0,2 %

    Fluoride

    Not more than 10 mg/kg (expressed as fluorine)

    Arsenic

    Not more than 1 mg/kg

    Cadmium

    Not more than 1 mg/kg

    Lead

    Not more than 1mg/kg

    Mercury

    Not more than 1 mg/kg

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