Annex II
United Kingdom
In the Annex to Regulation (EU) No 231/2012, the following entry is inserted after the specifications for food additive E 450 (vii):
‘
E 450(ix) MAGNESIUM DIHYDROGEN DIPHOSPHATE Synonyms Acid magnesium pyrophosphate, monomagnesium dihydrogen pyrophosphate; magnesium diphosphate, magnesium pyrophosphate Definition Magnesium dihydrogen diphosphate is the acidic magnesium salt of diphosphoric acid. It is manufactured by adding an aqueous dispersion of magnesium hydroxide slowly to phosphoric acid, until a molar ratio about 1:2 between Mg and P is reached. The temperature is held under 60 °C during the reaction. About 0,1 % hydrogen peroxide is added to the reaction mixture and the slurry is then heated and milled. EINECS 244-016-8 Chemical name Mono magnesium dihydrogen diphosphate Chemical formula MgH2P2O7 Molecular Weight 200,25 Assay P2O5 content not less than 68,0 % and not more than 70,5 % expressed as P2O5
MgO content not less than 18,0 % and not more than 20,5 % expressed as MgO
Description White crystals or powder Identification Solubility Slightly soluble in water, practically insoluble in ethanol Particle size: The average particle size will deviate between 10 and 50 μm Purity Loss on ignition Not more than 12 % (800 °C, 0,5 hours) Fluoride Not more than 20 mg/kg (expressed as fluorine) Aluminium Not more than 50 mg/kg Arsenic Not more than 1 mg/kg Cadmium Not more than 1 mg/kg. Lead Not more than 1 mg/kg ’